q | Run SQL directly on delimited files | CSV Processing library

 by   harelba Python Version: latest License: GPL-3.0

kandi X-RAY | q Summary

kandi X-RAY | q Summary

q is a Python library typically used in Utilities, CSV Processing applications. q has no bugs, it has no vulnerabilities, it has build file available, it has a Strong Copyleft License and it has high support. You can download it from GitHub.

q's purpose is to bring SQL expressive power to the Linux command line and to provide easy access to text as actual data.
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            kandi-support Support

              q has a highly active ecosystem.
              It has 9880 star(s) with 408 fork(s). There are 168 watchers for this library.
              OutlinedDot
              It had no major release in the last 12 months.
              There are 86 open issues and 130 have been closed. On average issues are closed in 264 days. There are 16 open pull requests and 0 closed requests.
              OutlinedDot
              It has a negative sentiment in the developer community.
              The latest version of q is latest

            kandi-Quality Quality

              q has 0 bugs and 0 code smells.

            kandi-Security Security

              q has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              q code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              q is licensed under the GPL-3.0 License. This license is Strong Copyleft.
              Strong Copyleft licenses enforce sharing, and you can use them when creating open source projects.

            kandi-Reuse Reuse

              q releases are available to install and integrate.
              Build file is available. You can build the component from source.
              Installation instructions are not available. Examples and code snippets are available.
              It has 6971 lines of code, 543 functions and 10 files.
              It has medium code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed q and discovered the below as its top functions. This is intended to give you an instant insight into q implemented functionality, and help decide if they suit your requirements.
            • Execute the pipeline
            • Closes all databases
            • Dump default values
            • Dump the default values
            • Choose the db to use
            • Calculate the content key for the given content signature
            • Execute a SQL query and return the result
            • Add entry to qcatalog table
            • Autodetect table name from qsql
            • Get all entries from qcatalog
            • Perform analysis
            • Perform the analysis
            • Create qcatalog table
            • Validate the table name in the Qsqlite3 database
            • Returns the name of the table in the Sqlite3 database
            • Unload all tables
            • Normalize qtable name
            • Validate the table name in Sqlite3
            • Quote double quotes
            • Finalize the histogram
            • Quote non - numeric characters
            • Creates a list of files that match the given qtable
            • Generator that yields csv rows
            • Choose a db to use
            • Make the data available for the database
            • Make the data available in the database
            Get all kandi verified functions for this library.

            q Key Features

            No Key Features are available at this moment for q.

            q Examples and Code Snippets

            In [3]: pd.period_range(start='2017Q1', end='2017Q4', periods=6, freq='Q')
            Pythondot img1Lines of Code : 236dot img1License : Permissive (BSD-3-Clause)
            copy iconCopy
            
            - :meth:`DataFrame.from_csv` and :meth:`Series.from_csv` have been deprecated in favor of :func:`read_csv()` (:issue:`4191`)
            - :func:`read_excel()` has deprecated ``sheetname`` in favor of ``sheet_name`` for consistency with ``.to_excel()`` (:issue:  
            Q: How to create a root user?
            Godot img2Lines of Code : 5dot img2License : Strong Copyleft (GPL-3.0)
            copy iconCopy
            ./tinode-db -auth=ROOT -uid=usrAbcDef123 -scheme=basic
            
            r.db('tinode').table('auth').get('basic:login-of-the-user-to-make-root').update({authLvl: 30})
            
            USE 'tinode';
            UPDATE auth SET authlvl=30 WHERE uname='basic:login-of-the-user-to-make-root';
            
            db.g  
            Q: Where can I find server logs when running in Docker?
            Godot img3Lines of Code : 2dot img3License : Strong Copyleft (GPL-3.0)
            copy iconCopy
            docker exec -it name-of-the-running-container /bin/bash
            
            docker cp name-of-the-container:/var/log/tinode.log ./tinode.log
              
            Compute the number of cross - references between P and Q .
            pythondot img4Lines of Code : 42dot img4License : Permissive (MIT License)
            copy iconCopy
            def _count_cross_inversions(P, Q):
                """
                Counts the inversions across two sorted arrays.
                And combine the two arrays into one sorted array
                For all 1<= i<=len(P) and for all 1 <= j <= len(Q),
                if P[i] > Q[j], then (i, j)  
            q - 4 flow control
            JavaScriptdot img5Lines of Code : 32dot img5License : Permissive (MIT License)
            copy iconCopy
            "use strict";
            
            var Q = require("../../q");
            
            // We get back blocking semantics: can use promises with `if`, `while`, `for`,
            // etc.
            var filter = Q.async(function* (promises, test) {
                var results = [];
                for (var i = 0; i < promises.length; i++  
            Returns the common ancestor of a tree rooted at a p and q .
            javadot img6Lines of Code : 30dot img6no licencesLicense : No License
            copy iconCopy
            public static Result commonAncestorHelper(TreeNode root, TreeNode p, TreeNode q) {
            		if (root == null) {
            			return new Result(null, false);
            		}
            		if (root == p && root == q) {
            			return new Result(root, true);
            		}
            		
            		Result rx = commonAnces  

            Community Discussions

            QUESTION

            How to override a nested npm sub-dependency with a different package altogether (not just different package version number)?
            Asked 2022-Apr-04 at 01:19
            Overview

            I am having trouble resolving a ReDoS vulnerability identified by npm audit. My application has a nested sub-dependency ansi-html that is vulnerable to attack, but unfortunately, it seems that the maintainers have gone AWOL. As you can see in the comments section of that Github issue, to get around this problem, the community has made a fork of the repo called ansi-html-community located here, which addresses this vulnerability.

            Thus, I would like to replace all nested references of ansi-html with ansi-html-community.

            Problem

            My normal strategy of using npm-force-resolutions does not seem to be able to override nested sub-dependencies with a different package altogether but rather only the same packages that are a different version number. I have researched this for several hours, but unfortunately, the only way I have found to fix this would appear to be with yarn, which I am now seriously considering using instead of npm. However, this is not ideal as our entire CI/CD pipeline is configured to use npm.

            Does anyone know of any other way to accomplish nested sub-dependency package substitution/resolution without having to switch over to using yarn?

            Related Questions

            These are questions of interest that I was able to find, but unfortunately, they tend to only discuss methods to override package version number, not the package itself.

            Discusses how to override version number:

            How do I override nested NPM dependency versions?

            Has a comment discussion about npm shrinkwrap (not ideal):

            npm - how to override a dependent package's dependencies?

            Other related StackOverflow questions:

            CSE Index of related questions

            ...

            ANSWER

            Answered 2021-Oct-29 at 21:01

            I figured it out. As of October 2021, the solution using npm-force-resolutions is actually very similar to how you would specify it using yarn. You just need to provide a link to the tarball where you would normally specify the overriding version number. Your resolutions section of package.json should look like this:

            Source https://stackoverflow.com/questions/69548370

            QUESTION

            Google OAuth 2.0 failing with Error 400: invalid_request for some client_id, but works well for others in the same project
            Asked 2022-Mar-30 at 14:21

            We have some apps (or maybe we should call them a handful of scripts) that use Google APIs to facilitate some administrative tasks. Recently, after making another client_id in the same project, I started getting an error message similar to the one described in localhost redirect_uri does not work for Google Oauth2 (results in 400: invalid_request error). I.e.,

            Error 400: invalid_request

            You can't sign in to this app because it doesn't comply with Google's OAuth 2.0 policy for keeping apps secure.

            You can let the app developer know that this app doesn't comply with one or more Google validation rules.

            Request details:

            The content in this section has been provided by the app developer. This content has not been reviewed or verified by Google.

            If you’re the app developer, make sure that these request details comply with Google policies.

            redirect_uri: urn:ietf:wg:oauth:2.0:oob

            How do I get through this error? It is important to note that:

            • The OAuth consent screen for this project is marked as "Internal". Therefore any mentions of Google review of the project, or publishing status are irrelevant
            • I do have "Trust internal, domain-owned apps" enabled for the domain
            • Another client id in the same project works and there are no obvious differences between the client IDs - they are both "Desktop" type which only gives me a Client ID and Client secret that are different
            • This is a command line script, so I use the "copy/paste" verification method as documented here hence the urn:ietf:wg:oauth:2.0:oob redirect URI (copy/paste is the only friendly way to run this on a headless machine which has no browser).
            • I was able to reproduce the same problem in a dev domain. I have three client ids. The oldest one is from January 2021, another one from December 2021, and one I created today - March 2022. Of those, only the December 2021 works and lets me choose which account to authenticate with before it either accepts it or rejects it with "Error 403: org_internal" (this is expected). The other two give me an "Error 400: invalid_request" and do not even let me choose the "internal" account. Here are the URLs generated by my app (I use the ruby google client APIs) and the only difference between them is the client_id - January 2021, December 2021, March 2022.

            Here is the part of the code around the authorization flow, and the URLs for the different client IDs are what was produced on the $stderr.puts url line. It is pretty much the same thing as documented in the official example here (version as of this writing).

            ...

            ANSWER

            Answered 2022-Mar-02 at 07:56

            steps.oauth.v2.invalid_request 400 This error name is used for multiple different kinds of errors, typically for missing or incorrect parameters sent in the request. If is set to false, use fault variables (described below) to retrieve details about the error, such as the fault name and cause.

            • GenerateAccessToken GenerateAuthorizationCode
            • GenerateAccessTokenImplicitGrant
            • RefreshAccessToken

            Google Oauth Policy

            Source https://stackoverflow.com/questions/71318804

            QUESTION

            android:exported needs to be explicitly specified for . Apps targeting Android 12 and higher are required to specify
            Asked 2022-Feb-23 at 14:13

            After upgrading to android 12, the application is not compiling. It shows

            "Manifest merger failed with multiple errors, see logs"

            Error showing in Merged manifest:

            Merging Errors: Error: android:exported needs to be explicitly specified for . Apps targeting Android 12 and higher are required to specify an explicit value for android:exported when the corresponding component has an intent filter defined. See https://developer.android.com/guide/topics/manifest/activity-element#exported for details. main manifest (this file)

            I have set all the activity with android:exported="false". But it is still showing this issue.

            My manifest file:

            ...

            ANSWER

            Answered 2021-Aug-04 at 09:18

            I'm not sure what you're using to code, but in order to set it in Android Studio, open the manifest of your project and under the "activity" section, put android:exported="true"(or false if that is what you prefer). I have attached an example.

            Source https://stackoverflow.com/questions/68554294

            QUESTION

            One or more issues found when checking AAR metadata values:
            Asked 2022-Feb-18 at 17:01

            Hey I am trying to run my application and I am getting this error

            build.gradle

            ...

            ANSWER

            Answered 2021-Nov-19 at 06:20

            Dependency: androidx.lifecycle:lifecycle-runtime-ktx:2.4.0. The issue is with this dependency, there may be some transitive dependency error. I would suggest use the alpha version of this dependency, worked for me. Replace with this dependency : androidx.lifecycle:lifecycle-*:2.4.0-alpha03

            Source https://stackoverflow.com/questions/69943549

            QUESTION

            How do I calculate square root in Python?
            Asked 2022-Feb-17 at 03:40

            I need to calculate the square root of some numbers, for example √9 = 3 and √2 = 1.4142. How can I do it in Python?

            The inputs will probably be all positive integers, and relatively small (say less than a billion), but just in case they're not, is there anything that might break?

            Related

            Note: This is an attempt at a canonical question after a discussion on Meta about an existing question with the same title.

            ...

            ANSWER

            Answered 2022-Feb-04 at 19:44
            Option 1: math.sqrt()

            The math module from the standard library has a sqrt function to calculate the square root of a number. It takes any type that can be converted to float (which includes int) as an argument and returns a float.

            Source https://stackoverflow.com/questions/70793490

            QUESTION

            What is the correct way to install Android Studio Bumblebee 2021.1.1 Patch 1
            Asked 2022-Feb-10 at 11:10

            I am sorry but I am really confused and leery now, so I am resorting to SO to get some clarity.

            I am running Android Studio Bumblebee and saw a notification about a major new release wit the following text:

            ...

            ANSWER

            Answered 2022-Feb-10 at 11:10

            This issue was fixed by Google (10 February 2022).

            You can now update Android Studio normally.

            Source https://stackoverflow.com/questions/70999801

            QUESTION

            Understanding color scales in ggplot2
            Asked 2022-Feb-03 at 17:47

            There are so many ways to define colour scales within ggplot2. After just loading ggplot2 I count 22 functions beginging with scale_color_* (or scale_colour_*) and same number beginging with scale_fill_*. Is it possible to briefly name the purpose of the functions below? Particularly I struggle with the differences of some of the functions and when to use them.

            • scale_*_binned()
            • scale_*_brewer()
            • scale_*_continuous()
            • scale_*_date()
            • scale_*_datetime()
            • scale_*_discrete()
            • scale_*_distiller()
            • scale_*_fermenter()
            • scale_*_gradient()
            • scale_*_gradient2()
            • scale_*_gradientn()
            • scale_*_grey()
            • scale_*_hue()
            • scale_*_identity()
            • scale_*_manual()
            • scale_*_ordinal()
            • scale_*_steps()
            • scale_*_steps2()
            • scale_*_stepsn()
            • scale_*_viridis_b()
            • scale_*_viridis_c()
            • scale_*_viridis_d()

            What I tried

            I've tried to make some research on the web but the more I read the more I get onfused. To drop some random example: "The default scale for continuous fill scales is scale_fill_continuous() which in turn defaults to scale_fill_gradient()". I do not get what the difference of both functions is. Again, this is just an example. Same is true for scale_color_binned() and scale_color_discrete() where I can not name the difference. And in case of scale_color_date() and scale_color_datetime() the destription says "scale_*_gradient creates a two colour gradient (low-high), scale_*_gradient2 creates a diverging colour gradient (low-mid-high), scale_*_gradientn creates a n-colour gradient." which is nice to know but how is this related to scale_color_date() and scale_color_datetime()? Looking for those functions on the web does not give me very informative sources either. Reading on this topic gets also chaotic because there are tons of color palettes in different packages which are sequential/ diverging/ qualitative plus one can set same color in different ways, i.e. by color name, rgb, number, hex code or palette name. In part this is not directly related to the question about the 2*22 functions but in some cases it is because providing a "wrong" palette results in an error (e.g. the error"Continuous value supplied to discrete scale).

            Why I ask this

            I need to do many plots for my work and I am supposed to provide some function that returns all kind of plots. The plots are supposed to have similiar layout so that they fit well together. One aspect I need to consider here is that the colour scales of the plots go well together. See here for example, where so many different kind of plots have same colour scale. I was hoping I could use some general function which provides a colour palette to any data, regardless of whether the data is continuous or categorical, whether it is a fill or col easthetic. But since this is not how colour scales are defined in ggplot2 I need to understand what all those functions are good for.

            ...

            ANSWER

            Answered 2022-Feb-01 at 18:14

            This is a good question... and I would have hoped there would be a practical guide somewhere. One could question if SO would be a good place to ask this question, but regardless, here's my attempt to summarize the various scale_color_*() and scale_fill_*() functions built into ggplot2. Here, we'll describe the range of functions using scale_color_*(); however, the same general rules will apply for scale_fill_*() functions.

            Overall Categorization

            There are 22 functions in all, but happily we can group them intelligently based on practical usage scenarios. There are three key criteria that can be used to define practically how to use each of the scale_color_*() functions:

            1. Nature of the mapping data. Is the data mapped to the color aesthetic discrete or continuous? CONTINUOUS data is something that can be explained via real numbers: time, temperature, lengths - these are all continuous because even if your observations are 1 and 2, there can exist something that would have a theoretical value of 1.5. DISCRETE data is just the opposite: you cannot express this data via real numbers. Take, for example, if your observations were: "Model A" and "Model B". There is no obvious way to express something in-between those two. As such, you can only represent these as single colors or numbers.

            2. The Colorspace. The color palette used to draw onto the plot. By default, ggplot2 uses (I believe) a color palette based on evenly-spaced hue values. There are other functions built into the library that use either Brewer palettes or Viridis colorspaces.

            3. The level of Specification. Generally, once you have defined if the scale function is continuous and in what colorspace, you have variation on the level of control or specification the user will need or can specify. A good example of this is the functions: *_continuous(), *_gradient(), *_gradient2(), and *_gradientn().

            Continuous Scales

            We can start off with continuous scales. These functions are all used when applied to observations that are continuous variables (see above). The functions here can further be defined if they are either binned or not binned. "Binning" is just a way of grouping ranges of a continuous variable to all be assigned to a particular color. You'll notice the effect of "binning" is to change the legend keys from a "colorbar" to a "steps" legend.

            The continuous example (colorbar legend):

            Source https://stackoverflow.com/questions/70942728

            QUESTION

            How can I efficiently calculate a quadratic form in Julia?
            Asked 2022-Jan-10 at 14:47

            I would like to calculate a quadratic form: x' Q y in Julia.
            What would be the most efficient way to calculate this for the cases:

            1. No assumption.
            2. Q is symmetric.
            3. x and y are the same (x = y).
            4. Both Q is symmetric and x = y.

            I know Julia has dot(). But I wonder if it is faster than BLAS call.

            ...

            ANSWER

            Answered 2022-Jan-09 at 22:28

            If your matrix is symmetric use the Symmetric wrapper to improve performance (a different method is called then):

            Source https://stackoverflow.com/questions/70645845

            QUESTION

            What is the significance of 'strongly happens before' compared to '(simply) happens before'?
            Asked 2022-Jan-02 at 18:21

            The standard defines several 'happens before' relations that extend the good old 'sequenced before' over multiple threads:

            [intro.races]

            11 An evaluation A simply happens before an evaluation B if either

            (11.1) — A is sequenced before B, or
            (11.2) — A synchronizes with B, or
            (11.3) — A simply happens before X and X simply happens before B.

            [Note 10: In the absence of consume operations, the happens before and simply happens before relations are identical. — end note]

            12 An evaluation A strongly happens before an evaluation D if, either

            (12.1) — A is sequenced before D, or
            (12.2) — A synchronizes with D, and both A and D are sequentially consistent atomic operations ([atomics.order]), or
            (12.3) — there are evaluations B and C such that A is sequenced before B, B simply happens before C, and C is sequenced before D, or
            (12.4) — there is an evaluation B such that A strongly happens before B, and B strongly happens before D.

            [Note 11: Informally, if A strongly happens before B, then A appears to be evaluated before B in all contexts. Strongly happens before excludes consume operations. — end note]

            (bold mine)

            The difference between the two seems very subtle. 'Strongly happens before' is never true for matching pairs or release-acquire operations (unless both are seq-cst), but it still respects release-acquire syncronization in a way, since operations sequenced before a release 'strongly happen before' the operations sequenced after the matching acquire.

            Why does this difference matter?

            'Strongly happens before' was introduced in C++20, and pre-C++20, 'simply happens before' used to be called 'strongly happens before'. Why was it introduced?

            [atomics.order]/4 says that the total order of all seq-cst operations is consistent with 'strongly happens before'.

            Does it mean that it's not consistent with 'simply happens before'? If so, why not?

            I'm ignoring the plain 'happens before', because it differs from 'simply happens before' only in its handling of memory_order_consume, the use of which is temporarily discouraged, since apparently most (all?) major compilers treat it as memory_order_acquire.

            I've already seen this Q&A, but it doesn't explain why 'strongly happens before' exists, and doesn't fully address what it means (it just states that it doesn't respect release-acquire syncronization, which isn't completely the case).

            Found the proposal that introduced 'simply happens before'.

            I don't fully understand it, but it explains following:

            • 'Strongly happens before' is a weakened version of 'simply happens before'.
            • The difference is only observable when seq-cst is mixed with aqc-rel on the same variable (I think, it means when an acquire load reads a value from a seq-cst store, or when an seq-cst load reads a value from a release store). But the exact effects of mixing the two are still unclear to me.
            ...

            ANSWER

            Answered 2022-Jan-02 at 18:21

            Here's my current understanding, which could be incomplete or incorrect. A verification would be appreciated.

            C++20 renamed strongly happens before to simply happens before, and introduced a new, more relaxed definition for strongly happens before, which imposes less ordering.

            Simply happens before is used to reason about the presence of data races in your code. (Actually that would be the plain 'happens before', but the two are equivalent in absence of consume operations, the use of which is discouraged by the standard, since most (all?) major compilers treat them as acquires.)

            The weaker strongly happens before is used to reason about the global order of seq-cst operations.

            This change was introduced in proposal P0668R5: Revising the C++ memory model, which is based on the paper Repairing Sequential Consistency in C/C++11 by Lahav et al (which I didn't fully read).

            The proposal explains why the change was made. Long story short, the way most compilers implement atomics on Power and ARM architectures turned out to be non-conformant in rare edge cases, and fixing the compilers had a performance cost, so they fixed the standard instead.

            The change only affects you if you mix seq-cst operations with acquire-release operations on the same atomic variable (i.e. if an acquire operation reads a value from a seq-cst store, or a seq-cst operation reads a value from a release store).

            If you don't mix operations in this manner, then you're not affected (i.e. can treat simply happens before and strongly happens before as equivalent).

            The gist of the change is that the synchronization between a seq-cst operation and the corresponding acquire/release operation no longer affects the position of this specific seq-cst operation in the global seq-cst order, but the synchronization itself is still there.

            This makes the seq-cst order for such seq-cst operations very moot, see below.

            The proposal presents following example, and I'll try to explain my understanding of it:

            Source https://stackoverflow.com/questions/70554277

            QUESTION

            Use recode to mutate across multiple columns using named list of named vectors
            Asked 2021-Dec-19 at 17:00

            I couldn't find a question similar to the one that I have here. I have a very large named list of named vectors that match column names in a dataframe. I would like to use the list of named vectors to replace values in the dataframe columns that match each list element's name. That is, the name of the vector in the list matches the name of the dataframe column and the key-value pair in each vector element will be used to recode the column.

            Reprex below:

            ...

            ANSWER

            Answered 2021-Dec-13 at 04:44

            One work around would be to use your map2_dfr code, but then bind the columns that are needed to the map2_dfr output. Though you still have to drop the names column.

            Source https://stackoverflow.com/questions/70329687

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install q

            You can download it from GitHub.
            You can use q like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.

            Support

            Any feedback/suggestions/complaints regarding this tool would be much appreciated. Contributions are most welcome as well, of course. Linkedin: Harel Ben Attia. q on twitter: #qtextasdata. Patreon: harelba - All the money received is donated to the Center for the Prevention and Treatment of Domestic Violence in my hometown - Ramla, Israel.
            Find more information at:

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