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Concatenating string and integer in python
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178
Modern string formatting:
"{} and {}".format("string", 1)
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In PyCharm, how to go back to last location?
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11 Answers
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Is there a benefit to defining a class inside another class in Python?
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126
You might want to do this when the "inner" class is a one-off, which will never be used outsid...
Broken references in Virtualenvs
...re is one example:
$ ls -la ~/.virtualenvs/my-virtual-env
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lrwxr-xr-x 1 ryan staff 78 Jun 25 13:21 .Python -> /usr/local/Cellar/python/2.7.7/Frameworks/Python.framework/Versions/2.7/Python
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When you upgrade Python using Homebrew and then run brew cleanup, the symlinks in the virtualen...
Postgresql GROUP_CONCAT equivalent?
...starting point (version 8.4+ only):
SELECT id_field, array_agg(value_field1), array_agg(value_field2)
FROM data_table
GROUP BY id_field
array_agg returns an array, but you can CAST that to text and edit as needed (see clarifications, below).
Prior to version 8.4, you have to define it yourself p...
How do I verify/check/test/validate my SSH passphrase?
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123
You can verify your SSH key passphrase by attempting to load it into your SSH agent. With Open...
How to round an average to 2 decimal places in PostgreSQL?
...ision is only available for numeric.
regress=> SELECT round( float8 '3.1415927', 2 );
ERROR: function round(double precision, integer) does not exist
regress=> \df *round*
List of functions
Schema | Name | Result data type | Argument data types | Type
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Read a text file using Node.js?
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176
You'll want to use the process.argv array to access the command-line arguments to get the file...
How do you tell if a string contains another string in POSIX sh?
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11 Answers
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