petl | Pretty good ETL framework | Data Migration library
kandi X-RAY | petl Summary
kandi X-RAY | petl Summary
Pretty good ETL framework.
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QUESTION
I have a Python program that generates reports from data in SQL database. For CI pipeline tests I create an in memory sqlite3 database using the following command:
...ANSWER
Answered 2020-Jun-29 at 06:54Okay as per Klaus' comment, the problem was locale. Our docker container has no localectl process, and even though locale is set in /etc/locale.conf the system defaults to POSIX. Adding LANG environmental variable fixed the problem.
QUESTION
First off, I am very new to all of python. I am now trying to figure out how to replace a time string in a certain column (csv) when that time is greater than the current time.
The script I am building from is relying on petl, so that is what i am using. First, the source csv is opened with petl as table1. It contains multiple columns, one of which is " End time". In this column I would like to replace that time with @time? (for HTML formatting later), only if it is greater than the current time.
the time has the format like "12:15". However, I do not see any change when running the line with >, yet with < all values in the column change.
The line I am struggling with:
...ANSWER
Answered 2020-Apr-28 at 11:03If you only pass hour and minute to time.strptime, strptime automatically fills in the missing values for year, month, day with 1900, 1, 1 - so of course that's always less than time.localtime().
If your table contains times in 24 hour format, you can directly compare the time strings from your table with the localtime in the narrower sense (just the TIME part).
To achieve this, use time formatting like so:
QUESTION
Trying to seek some guidance on the best way of curating an extensive ETL process. My pipeline has a reasonably sleek extract section, and loads into a designated file in a succinct manner; but the only way I can think to do transformation steps is a series of variable assignments:
...ANSWER
Answered 2019-Jul-15 at 14:27Create a list of partially applied functions, then loop over that list.
QUESTION
I have a table having duplicate rows in consecutive rows. Row having same 'id' should have duplicate data in other columns.But there are few rows in which data is not proper. Eg -
...ANSWER
Answered 2019-Jul-02 at 12:03okay this works
QUESTION
Error on ETL code on python
I managed to learn some lines of code on python to perform ETL processes in MS SQL environment. the initial script was for PostgreSQL environment. I want to use mine for MS SQL. I tried editing the code however I got an error. Please kindly have a look
...ANSWER
Answered 2019-May-15 at 14:22Support for DROP TABLE IF EXISTS ... was introduced in Microsoft SQL Server 2016. You are apparently using an earlier version of SQL Server, so you will have to use a workaround. See this question for details.
QUESTION
I'm trying to select rows within a table and create a new table with the information from the original table using PETL.
My code right now is:
...ANSWER
Answered 2018-Sep-20 at 13:34"{Postcode} == 'post_code'" will not replace post_code with the value passed to your selection function.
You need to format your select string (and escape {Postcode} when using format)
QUESTION
I'm trying to parse information from an XML file into a table that has already been created from another CSV file with Petl and am having trouble with the syntax of the fromxml() function.
The XML file contains:
...ANSWER
Answered 2018-Sep-19 at 05:18A "flat" argument list to .fromxml() only works if you also have a flat kind of XML structure, where all the data columns have the same name:
QUESTION
I'm using petl and trying to create a simple table with a value from a query. I have written the following:
...ANSWER
Answered 2018-Jun-08 at 14:35You should be passing in parameters when you execute the statement rather than munging the string . . but that is not central to your question.
Possibly the simplest solution is to do all the work in SQL. If you are expecting at most one row from the query, then:
QUESTION
I have the following table:
...ANSWER
Answered 2018-Jun-06 at 20:58There are three major problems with your function.
First, you're trying to assign a value to v. But assignments are statements, not expressions. You can't put statements inside expressions in Python, and lambda is an expression. But you can always just use def instead:
QUESTION
Code:::
...ANSWER
Answered 2018-Feb-21 at 01:07Convert the table to JSON like this, it requires that you use the json module. This was created from looking around in the petl module source.
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