mod | Modular arithmetic in Python :100 | Math library

 by   yoeo Python Version: 0.3.0 License: MIT

kandi X-RAY | mod Summary

kandi X-RAY | mod Summary

mod is a Python library typically used in Institutions, Learning, Education, Utilities, Math applications. mod has no vulnerabilities, it has build file available, it has a Permissive License and it has low support. However mod has 2 bugs. You can install using 'pip install mod' or download it from GitLab, GitHub, PyPI.

Modular arithmetic in Python. Modular arithmetic is arithmetic for integers, where numbers wrap around when reaching a given value called modulus. For example 6 ≡ 1 (mod 5). Modular arithmetic has several practical applications including: music, banking, book publishing, cryptography... and of course math. The purpose of this package is to simplify the use of modular arithmetic in Python3.
Support
    Quality
      Security
        License
          Reuse

            kandi-support Support

              mod has a low active ecosystem.
              It has 8 star(s) with 3 fork(s). There are 2 watchers for this library.
              OutlinedDot
              It had no major release in the last 12 months.
              There are 1 open issues and 2 have been closed. On average issues are closed in 181 days. There are 1 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of mod is 0.3.0

            kandi-Quality Quality

              mod has 2 bugs (0 blocker, 0 critical, 2 major, 0 minor) and 13 code smells.

            kandi-Security Security

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

            kandi-License License

              mod is licensed under the MIT License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              mod releases are not available. You will need to build from source code and install.
              Deployable package is available in PyPI.
              Build file is available. You can build the component from source.
              Installation instructions, examples and code snippets are available.
              It has 618 lines of code, 72 functions and 6 files.
              It has high code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed mod and discovered the below as its top functions. This is intended to give you an instant insight into mod implemented functionality, and help decide if they suit your requirements.
            • Generate a long description .
            Get all kandi verified functions for this library.

            mod Key Features

            No Key Features are available at this moment for mod.

            mod Examples and Code Snippets

            mod ,Usage
            Pythondot img1Lines of Code : 28dot img1License : Permissive (MIT)
            copy iconCopy
            from mod import Mod
            
            # Funny math here
            
            x = Mod(5, 7)      # x ≡ 5 (mod 7)
            
            (x + 2) == 0       # True: 5 + 2 ≡ 7 ≡ 0 (mod 7)
            (x + 7) == x       # True: 5 + 7 ≡ 12 ≡ 5 (mod 7)
            (x**3) == (x + 1)  # True: 5³ ≡ 125 ≡ 6 (mod 7)
            (1 // x) == 3      # True:   
            mod ,Install
            Pythondot img2Lines of Code : 1dot img2License : Permissive (MIT)
            copy iconCopy
            pip3 install mod
              
            Binary modulo mod b
            pythondot img3Lines of Code : 17dot img3License : Permissive (MIT License)
            copy iconCopy
            def bin_exp_mod(a, n, b):
                """
                >>> bin_exp_mod(3, 4, 5)
                1
                >>> bin_exp_mod(7, 13, 10)
                7
                """
                # mod b
                assert not (b == 0), "This cannot accept modulo that is == 0"
                if n == 0:
                    return 1
            
                if   
            Find the mod inverse of a mod .
            pythondot img4Lines of Code : 9dot img4License : Permissive (MIT License)
            copy iconCopy
            def find_mod_inverse(a: int, m: int) -> int:
                if gcd(a, m) != 1:
                    raise ValueError(f"mod inverse of {a!r} and {m!r} does not exist")
                u1, u2, u3 = 1, 0, a
                v1, v2, v3 = 0, 1, m
                while v3 != 0:
                    q = u3 // v3
                    v1, v2  
            Permute mod .
            pythondot img5Lines of Code : 2dot img5License : Non-SPDX (Apache License 2.0)
            copy iconCopy
            def __mod__(self, o):
                return self.read_value() % o  

            Community Discussions

            QUESTION

            polynomial (in n) time algorithm that decides whether N is a power
            Asked 2022-Apr-02 at 22:23

            I am a computer science student; I am studying the Algorithms course independently.

            During the course, I saw this question:

            Given an n-bit integer N, find a polynomial (in n) time algorithm that decides whether N is a power (that is, there are integers a and k > 1 so that a^k = N).

            I thought of a first option that is exponential in n: For all k , 1

            For example, if N = 27, I will start with k = 2 , because 2 doesn't divide 27, I will go to next k =3. I will divide 27 / 3 to get 9, and divide it again until I will get 1. This is not a good solution because it is exponential in n.

            My second option is using Modular arithmetic, using ak ≡ 1 mod (k+1) if gcd(a, k+1 ) = 1 (Euler's theorem). I don't know if a and k are relatively prime.

            I am trying to write an algorithm, but I am struggling to do it:

            ...

            ANSWER

            Answered 2022-Mar-15 at 10:07

            Ignoring the cases when N is 0 or 1, you want to know if N is representable as a^b for a>1, b>1.

            If you knew b, you could find a in O(log(N)) arithmetic operations (using binary search). Each arithmetic operation including exponentiation runs in polynomial time in log(N), so that would be polynomial too.

            It's possible to bound b: it can be at most log_2(N)+1, otherwise a will be less than 2.

            So simply try each b from 2 to floor(log_2(N)+1). Each try is polynomial in n (n ~= log_2(N)), and there's O(n) trials, so the resulting time is polynomial in n.

            Source https://stackoverflow.com/questions/71479288

            QUESTION

            How to generate video preview thumbnails using nodejs and ffmpeg?
            Asked 2022-Mar-27 at 18:50

            I am creating a custom video player, I would like to add a video preview when the user hovers a progress bar.

            I am able to generate thumbnails using FFmpeg as follows.

            ...

            ANSWER

            Answered 2022-Mar-27 at 18:50

            You will have to make your own tool for creating the WEBVTT file. And it's a simple process, you just need to get the information you need and fill it in the following format:

            Source https://stackoverflow.com/questions/69846515

            QUESTION

            package io/fs is not in GOROOT while building the go project
            Asked 2022-Mar-14 at 19:15

            I don't have much experience in go but I have been tasked to execute a go project :)

            So i need to build the go project and then execute it

            Below is the error when i build the go project. Seems to be some dependency(package and io/fs) is missing

            ...

            ANSWER

            Answered 2021-Aug-12 at 05:56

            This package requires go v1.16, please upgrade your go version or use the appropriate docker builder.

            Source https://stackoverflow.com/questions/68752103

            QUESTION

            How to get UniquePtr on the Rust side? (CXX crate)
            Asked 2022-Jan-27 at 20:47

            Using the cxx crate: https://crates.io/crates/cxx

            I have the following struct on Rust:

            ...

            ANSWER

            Answered 2022-Jan-27 at 20:47

            QUESTION

            How to stop PyCharm's break/stop/halt feature on handled exceptions (i.e. only break on python unhandled exceptions)?
            Asked 2022-Jan-26 at 00:10

            I have that PyCharm is halting on all my exceptions, even the ones I am handling in a try except block. I do not want it to break there - I am handling and perhaps expecting an error. But every other exception I do want it to halt and suspend execution (e.g. so that I have the program state and debug it).

            How does one do that?

            I tried going into the python exception breakpoint option but I didn't see an option like "break only on unhandled exceptions" e.g as suggested by these:

            note this is my current state, note how it stopped in my try block... :(

            crossposted: https://intellij-support.jetbrains.com/hc/en-us/community/posts/4415666598546-How-to-stop-PyCharm-s-break-stop-halt-feature-on-handled-exceptions-i-e-only-break-on-python-unhandled-exceptions-

            I tried:

            ...

            ANSWER

            Answered 2022-Jan-25 at 23:49

            I think it is already working actually, but you are in fact not catching the correct error. In your code you have:

            Source https://stackoverflow.com/questions/70761481

            QUESTION

            How do I capture default arguments with `|c`?
            Asked 2022-Jan-11 at 17:04

            I've got this function here:

            ...

            ANSWER

            Answered 2022-Jan-11 at 17:04

            OK, based on responses in IRC, this does not appear to be possible. One suggested workaround:

            Source https://stackoverflow.com/questions/70658741

            QUESTION

            Raku: how do I make an argument optional, have a default, with a where test?
            Asked 2022-Jan-11 at 01:17

            Can't find a way to get this to work:

            sub triple(Str:D $mod where * ~~ any @modifiers = 'command' ) { }

            If I don't pass in an argument, I get an error:

            Too few positionals passed; expected 1 argument but got 0

            With a question mark after $mod:

            sub triple(Str:D $mod? where * ~~ any @modifiers = 'command' ) { }

            I get:

            Constraint type check failed in binding to parameter '$mod'; expected anonymous constraint to be met but got Str (Str)

            ...

            ANSWER

            Answered 2022-Jan-10 at 22:45

            Looks like it may have been a precedence problem. This works:

            Source https://stackoverflow.com/questions/70646585

            QUESTION

            Python Beautiful soup get correct column headers for each table
            Asked 2022-Jan-01 at 22:14

            The following code gets player data but each dataset is different. The first data it sees is the quarterback data, so it uses these columns for all the data going forward. How can I change the header so that for every different dataset it encounters, the correct headers are used with the correct data?

            ...

            ANSWER

            Answered 2022-Jan-01 at 22:14

            Here is my attempt. A few things to note. I am not printing to CSV but just showing you the dataframes with the correct header information, you can handle the CSV output later.

            You press enter after running the program to see the next tables with different headers.

            Source https://stackoverflow.com/questions/70546198

            QUESTION

            The pool returned by pgxpool.Connect is nil or becomes nil quickly without error
            Asked 2021-Dec-23 at 17:31

            I have the following code for connecting to a Postgres database:

            ...

            ANSWER

            Answered 2021-Dec-21 at 21:47

            The issue is that when connecting in a docker-compose network, you have to connect to the hostname of the container, in this case db.

            You could also use the other container's IP but would take additional amount of work, it's simpler to just use the hostname.

            In other words, you have the wrong connection string, I got this as well when connecting to localhost

            Source https://stackoverflow.com/questions/70439214

            QUESTION

            Assembly why is "lea eax, [eax + eax*const]; shl eax, eax, const;" combined faster than "imul eax, eax, const" according to gcc -O2?
            Asked 2021-Dec-13 at 10:27

            I'm using godbolt to get assembly of the following program:

            ...

            ANSWER

            Answered 2021-Dec-13 at 06:33

            You can see the cost of instructions on most mainstream architecture here and there. Based on that and assuming you use for example an Intel Skylake processor, you can see that one 32-bit imul instruction can be computed per cycle but with a latency of 3 cycles. In the optimized code, 2 lea instructions (which are very cheap) can be executed per cycle with a 1 cycle latency. The same thing apply for the sal instruction (2 per cycle and 1 cycle of latency).

            This means that the optimized version can be executed with only 2 cycle of latency while the first one takes 3 cycle of latency (not taking into account load/store instructions that are the same). Moreover, the second version can be better pipelined since the two instructions can be executed for two different input data in parallel thanks to a superscalar out-of-order execution. Note that two loads can be executed in parallel too although only one store can be executed in parallel per cycle. This means that the execution is bounded by the throughput of store instructions. Overall, only 1 value can only computed per cycle. AFAIK, recent Intel Icelake processors can do two stores in parallel like new AMD Ryzen processors. The second one is expected to be as fast or possibly faster on the chosen use-case (Intel Skylake processors). It should be significantly faster on very recent x86-64 processors.

            Note that the lea instruction is very fast because the multiply-add is done on a dedicated CPU unit (hard-wired shifters) and it only supports some specific constant for the multiplication (supported factors are 1, 2, 4 and 8, which mean that lea can be used to multiply an integer by the constants 2, 3, 4, 5, 8 and 9). This is why lea is faster than imul/mul.

            UPDATE (v2):

            I can reproduce the slower execution with -O2 using GCC 11.2 (on Linux with a i5-9600KF processor).

            The main source of source of slowdown comes from the higher number of micro-operations (uops) to be executed in the -O2 version certainly combined with the saturation of some execution ports certainly due to a bad micro-operation scheduling.

            Here is the assembly of the loop with -Os:

            Source https://stackoverflow.com/questions/70316686

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

            Vulnerabilities

            No vulnerabilities reported

            Install mod

            Run the following command to install mod package.

            Support

            Package documentation located at http://mod.readthedocs.io/en/latest/Python package available at https://pypi.python.org/pypi/modSource code repository: https://github.com/yoeo/mod
            Find more information at:

            Find, review, and download reusable Libraries, Code Snippets, Cloud APIs from over 650 million Knowledge Items

            Find more libraries
            Install
          • PyPI

            pip install mod

          • CLONE
          • HTTPS

            https://github.com/yoeo/mod.git

          • CLI

            gh repo clone yoeo/mod

          • sshUrl

            git@github.com:yoeo/mod.git

          • Stay Updated

            Subscribe to our newsletter for trending solutions and developer bootcamps

            Agree to Sign up and Terms & Conditions

            Share this Page

            share link