On 2018-07-20 08:04:33 +0200, Cecil Westerhof wrote:
> I can get the installed version of a package with:
> pip2 show cryptography | awk '/^Version: / { print $2 }'
>
> But I was wondering if there is a better way.
Using pip probably is the most reliable way (for packages installed via
pip).
Most packages have version information embedded, and most of them use
the attribute __version__:
>>> import chardet
>>> chardet.__version__
'2.3.0'
>>> import colorama
>>> colorama.__version__
'0.3.2'
>>> import psycopg2
>>> psycopg2.__version__
'2.5.4 (dt dec pq3 ext)'
>>> import numpy
>>> numpy.__version__
'1.8.2'
But there are exceptions:
>>> import xlrd
>>> xlrd.__VERSION__
'0.9.2'
or even:
>>> import django
>>> django.get_version()
'1.7.11'
So you can't rely on that.
hp
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