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Why is mechanize not installing properly via pip on RPi? (python 3.9)

I can’t get to successfully install the package ‘mechanize’ on a Raspberry Pi (so, ARM chip) with Debian Bullseye, python 3.9 in a virtualenv.

When I look in the virtualenv’s sitepackages folder, indeed the mechanize package only has .dist-info file, but not a file or mechanize package folder. See below.

Question: Am I overlooking something?

Details (1): Installing mechanize with pip

(venvtest) pi@mango:~/MyProject/myproj $ pip --version
pip 20.3.4 from /home/pi/MyProject/myproj/venvtest/lib/python3.9/site-packages/pip (python 3.9)

(venvtest) pi@mango:~/MyProject/myproj $ pip install mechanize
Looking in indexes:,
Collecting mechanize
Using cached (5.1 kB)
Requirement already satisfied: html5lib>=0.999999999 in /home/pi/MyProject/myproj/venvtest/lib/python3.9/site-packages (from mechanize) (1.1)
Requirement already satisfied: webencodings in /home/pi/MyProject/myproj/venvtest/lib/python3.9/site-packages (from html5lib>=0.999999999->mechanize) (0.5.1)
Requirement already satisfied: six>=1.9 in /home/pi/MyProject/myproj/venvtest/lib/python3.9/site-packages (from html5lib>=0.999999999->mechanize) (1.16.0)
Installing collected packages: mechanize
Successfully installed mechanize-0.4.8

(venvtest) pi@mango:~/MyProject/myproj $ pip list
Package       Version
------------- -------
html5lib      1.1
mechanize     0.4.8
pip           20.3.4
pkg-resources 0.0.0
setuptools    44.1.1
six           1.16.0
webencodings  0.5.1
wheel         0.34.2

Details (2): Package folder missing in sitelibs

(venvtest) pi@mango:~/MyProject/myproj/ $ ls venvtest/lib/python3.9/site-packages            pip-20.3.4.dist-info            __pycache__                                 wheel
html5lib                   pip-20.3.4.virtualenv           setuptools                    _virtualenv.pth               wheel-0.34.2.dist-info
html5lib-1.1.dist-info     pkg_resources                   setuptools-44.1.1.dist-info                wheel-0.34.2.virtualenv
mechanize-0.4.8.dist-info  pkg_resources-0.0.0.dist-info   setuptools-44.1.1.virtualenv  webencodings
pip                        pkg_resources-0.0.0.virtualenv  six-1.16.0.dist-info          webencodings-0.5.1.dist-info

Details (3): As a consequence, importing mechanize doesn’t work

(venvtest) pi@mango:~/MyProject/myproj $ python
Python 3.9.2 (default, Mar 12 2021, 04:06:34)
[GCC 10.2.1 20210110] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import mechanize
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'mechanize'
>>> exit()



It appears to be an issue with version 0.4.8. Installing version 0.4.7 works fine:

pip install mechanize==0.4.7

as can be seen:

(venvtest) pi@mango:~/MyProj/myproj $ python
Python 3.9.2 (default, Mar 12 2021, 04:06:34)
[GCC 10.2.1 20210110] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import mechanize
>>> print(mechanize.__version__)
(0, 4, 7, None, None)

I’ve opened a ticket at the mechanize github repository: