Develop Reference

error import cx_Freeze how i can resolve?

import cx_Freeze
Traceback (most recent call last):
File "", line 1, in
import cx_Freeze
ModuleNotFoundError: No module named 'cx_Freeze'

Have you installed cx_freeze with pip ?
If yes please try to upgrade cx_freeze
pip install --upgrade cx_freeze
If none of this not working, please try the following:
Run python.exe cxfreeze-postinstall from the command prompt, two batch files are being created in the Python scripts directory:
cxfreeze.bat
cxfreeze-quickstart.bat
From that moment on, you should be able to run cx_freeze.

It might be an issue with python 3.11 compatibility. I had the same issue, so installing a development version of cx_freeze solved the issue for me.
pip install --pre --extra-index-url https://marcelotduarte.github.io/packages/ cx_Freeze

"InvalidRequirement: Invalid requirement, parse error" error after updating a python package

After updating a package (IPython in my case) using pip install -U ipython running any Python script that uses entry points fails with this error:
Traceback (most recent call last):
File "/home/adrian/dev/indico/env/bin/indico", line 5, in <module>
from pkg_resources import load_entry_point
...
File "/home/adrian/dev/indico/env/lib/python2.7/site-packages/pkg_resources/_vendor/packaging/requirements.py", line 94, in __init__
requirement_string[e.loc:e.loc + 8], requirement_string))
pkg_resources._vendor.packaging.requirements.InvalidRequirement: Invalid requirement, parse error at "'< 2.0'"
Nothing else changed, I did not update any other libraries.

This is caused by an issue in setuptools==20.2.1 which is pulled in by IPython (setuptools>..), so a pip install -U updated it.
Until a fixed version is released or the broken version is pulled from PyPI there is a simple workaround (but note that it will break again if something updates setuptools):
pip install -U pip
pip uninstall setuptools
pip install 'setuptools<20.2'
The pip update is needed since older versions of pip will not work without setuptools being installed
See these IRC logs and BitBucket issue for details:
http://chat-logs.dcpython.org/day/pypa/2016-02-25
https://bitbucket.org/pypa/setuptools/issues/502/packaging-164-does-not-allow-whitepace

Try downgrading your pip to 8.1.1:
pip install pip==8.1.1
That solved it for me.

In my case I had package = "2.8.0" in my Pipfile. Changing it to package = "==2.8.0" fixed this error for me.

Not able to install the python-module numpy

After hours of trying I'm still not able to install numpy. I READ LOTS OF HINTS, ANSWERS USW. BUT IT DOESN'T HELP.
Furthermore I have windows 7, 32 bit, Python 27.
What I did:
download numpy-1.10.2.zip:
http://sourceforge.net/projects/numpy/files/
unzip it
start the windows command prompt and input:
cd C:\Users\myname\Desktop\numpy-1.10.2
now it appears:
C:\Users\myname\Desktop\numpy-1.10.2>
I input:
python setup.py install
and there appears an error:
Running from numpy source directory.
Traceback (most recent call last):
File "setup.py", line 263, in <module>
setup_package()
File "setup.py", line 246, in setup_pa
import setuptools
ImportError: No module named setuptools
I hope somebody can help me or even better IS THERE NOT EASIER WAY TO INSTALL NUMPY OR OTHER MODULES??

Building numpy from source on windows is non-trivial. Best use official binaries (http://sourceforge.net/projects/numpy/files/NumPy/1.10.2/) or Gohlke binaries (http://www.lfd.uci.edu/~gohlke/pythonlibs/#numpy) or a distribution like Anaconda or Canopy or WinPython.

You need to install the setuptools package as well. See here.
A more easy way to install python packages is using pip, which resolves package dependencies automatically. See here. Pip should be included in your python installation if you use a recent version.
You should succeed by calling pip install numpy.

How to fix Python ValueError:bad marshal data?

Running flexget Python script in Ubuntu, I get an error:
$ flexget series forget "Orange is the new black" s03e01
Traceback (most recent call last):
File "/usr/local/bin/flexget", line 7, in <module>
from flexget import main
File "/usr/local/lib/python2.7/dist-packages/flexget/__init__.py", line 11, in <module>
from flexget.manager import Manager
File "/usr/local/lib/python2.7/dist-packages/flexget/manager.py", line 21, in <module>
from sqlalchemy.ext.declarative import declarative_base
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/ext/declarative/__init__.py", line 8, in <module>
from .api import declarative_base, synonym_for, comparable_using, \
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/ext/declarative/api.py", line 11, in <module>
from ...orm import synonym as _orm_synonym, \
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/__init__.py", line 17, in <module>
from .mapper import (
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/mapper.py", line 27, in <module>
from . import properties
ValueError: bad marshal data (unknown type code)

If you get that error, the compiled version of the Python module (the .pyc file) is corrupt probably. Gentoo Linux provides python-updater, but in Debian the easier way to fix: just delete the .pyc file. If you don't know the pyc, just delete all of them (as root):
find /usr -name '*.pyc' -delete

There also appears to have been some sort of regression in setuptools with use with python 3.7. See for an example - https://github.com/pypa/setuptools/issues/1257
Forcing reinstallation of setuptools fixed this issue for me.
sudo pip3 install --upgrade --force-reinstall setuptools

Just delete
/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/properties.pyc
it is corrupt as the text indicates. You'll probably have to do so as root.
After that start (again as root) run python (2.7):
/usr/bin/python -c "import sqlalchemy.orm.properties"
to recreate this .pyc file.
If you don't recreate the .pyc file, your program starts slower than necessary as the .py file takes longer to load than the .pyc (and a normal user cannot write the .pyc file).

This can happen if you have Python 2.7 .pyc files and you try to load them using Python 3.5. In my case this was a third-party tarball that erroneously included pre-compiled Python 2.7 .pyc files along with the source code.

I get this error in Ubuntu 18.04 Raspberry Pi 3 when I trying update my system typing sudo apt-get update and solve this error just typing:
sudo find /usr -name '*.pyc' -delete
This is remove all .pyc file in my system. Now I typing again sudo apt-get update && sudo apt-get upgrade and I get my update without thie error marshal-data

I resolved a similar error by un-installing and re-installing the Python application I was using, and all dependencies, using the system package manager.
In my case I was using awscli on Debian 9 and the error was "ValueError: bad marshal data (set size out of range)".
I ran as root:
apt-get purge awscli
apt-get autoremove
apt-get install awscli
And then the error was fixed.
I could imagine cases where the broken package might not get removed (for example because it was marked as manually installed, or was a dependency of another application still installed), in those cases this action may not resolve the error. However I thought I should try this way before manually deleting .pyc files the system installed, and I got lucky.

I also got this problem in Windows environment(win 10).
I fixed it by going to the Settings and repairing Python 3.7 with its installer.
Everything works fine since then.
As far as I could recall, I had kept a dash server running when my computer went to hibernation.
Maybe the damage was done in the hibernating process somehow.

I solved this problem by the following procedure :
In the error code message, you can see
from sqlalchemy.ext.declarative import declarative_base cause this error.
So just pip uninstall sqlalchemy and pip install sqlalchemy, problem solved.

It may be because of the damage of the library. Try re-install the package.

I had the same error in a conda environment which traced back to importing the matplotlib package.
simply pip uninstall matplotlib and then pip install matplotlib solved the problem.

Why is Python easy_install not working on my Mac?

I have a Mac running Python 2.6. When I try to use easy_install I get this message:
/usr/bin/easy_install-2.6:7: UserWarning: Module pkg_resources was already imported from /System/Library/Frameworks/Python.framework/Versions/2.6/Extras/lib/python/pkg_resources.pyc, but /Library/Python/2.6/site-packages is being added to sys.path
from pkg_resources import load_entry_point
/usr/bin/easy_install-2.6:7: UserWarning: Module site was already imported from /System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site.pyc, but /Library/Python/2.6/site-packages is being added to sys.path
from pkg_resources import load_entry_point
Traceback (most recent call last):
File "/usr/bin/easy_install-2.6", line 10, in <module>
load_entry_point('setuptools==0.6c9', 'console_scripts', 'easy_install')()
File "/System/Library/Frameworks/Python.framework/Versions/2.6/Extras/lib/python/pkg_resources.py", line 271, in load_entry_point
return False
File "/System/Library/Frameworks/Python.framework/Versions/2.6/Extras/lib/python/pkg_resources.py", line 2173, in load_entry_point
deps = []
ImportError: Entry point ('console_scripts', 'easy_install') not found
I am very confused by this and I want to know how I can fix this. Previously I didn't get this message, then after installing pip and uninstalling it, easy_install no longer works. I was wondering how I could fix this, or restore the default Python or easy_install setting on Mac.

Check your /usr/bin and /usr/local/bin for easy_install installations and remove any old script:
sudo rm -f /usr/bin/easy_install*
sudo rm -f /usr/local/bin/easy_install*
Download and run distribute:
curl -O https://svn.apache.org/repos/asf/oodt/tools/oodtsite.publisher/trunk/distribute_setup.py
sudo python distribute_setup.py
sudo rm distribute_setup.py
Try again, and enjoy. E.g.:
sudo easy_install pip

I suspect the easiest way you can get easy_install working again is to install distribute, which is an improved version of distutils that bundles it's own version of easy_install. Installation is simple:
curl -O http://python-distribute.org/distribute_setup.py
/usr/bin/python2.6 distribute_setup.py

I had the same problem just after installing the new Operating System (Lion OSX).
After install python and execute it
sudo easy_install ipython
ipython
I got the following error:
Traceback (most recent call last):
File "/usr/local/bin/ipython", line 8, in <module>
load_entry_point('ipython==0.10.2', 'console_scripts', 'ipython')()
File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 318, in load_entry_point
return get_distribution(dist).load_entry_point(group, name)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 2220, in load_entry_point
raise ImportError("Entry point %r not found" % ((group,name),))
ImportError: Entry point ('console_scripts', 'ipython') not found
Then I realize it was a permission problem. If I execute the ipython script as sudo it worked.
sudo ipython
So I changed the ownership from root to my user () of the folder /Library/Python/2.7/site-packages/
sudo chown -R <your_user>:wheel /Library/Python/2.7/site-packages/
Use change ownership only if you don't have several accounts that uses python.
I hope it work for you.
Best

Your setuptools installation is broken. The easy_install-2.6 script in your /usr/bin directory, is only a wrapper that loads the actual easy_install module in your Python installation, and the latter is missing. Presumably uninstalling pip either broke the pointer to it (usually in the form of a .pth file in your site-packages directory) or removed the whole package but didn't remove the /usr/bin/easy_install-2.6 wrapper script.
Your best bet is to re-install setuptools from scratch again, by following the instructions on the setuptools PyPI page.

I had the same problem, I suspect caused by my installation of Homebrew which apparently installs its own version of easy_install blindly and screws up whatever you're currently running (enough times for homebrew to recognize it as a problem). I found my solution here Upgraded Python on Snowleopard Using Homebrew now pip and easy_install don't work
While I'm actually on Lion, it still fixed my problem. You just download ez_setup.py from http://pypi.python.org/pypi/ez_setup - run ez_setup.py through terminal and you're off to the races.

I had a similar error message after following similar steps. I suspect it's because I tried to install the distribute module, and it tried to install a new version of setuptools which
didn't quite work because it failed to correctly override the Mac OS X supplied setuptools. But that's only a suspicion.
I fixed my problem by doing the following. I found that the directory /System/Library/Frameworks/Python.framework/Versions/2.6/Extras/lib/python
had 4 files with .OLD in the name. When I did a compare with similarly named files without the .OLD from when things worked (via Time Machine) I found that they were the same except for the name. So I did the following renames:
setuptools.OLD.1305936263.57 ->
setuptools
setuptools-0.6c9-py2.6.egg-info.OLD.1305936263.57 -> setuptools-0.6c9-py2.6.egg-info pkg_resources.py.OLD.1305936263.57
-> pkg_resources site.py.OLD.1305936263.59 -> site.py
I had to use the command line and sudo mv because the files are owned by root. For example: sudo mv setuptools.OLD.1305936263.57 setuptools. You'll have to enter your password.
The other thing I did was clean the /Library/Python/2.6/site-packages directory. I used Time Machine to set it back to its pre-messed up state. If you don't have Time Machine, then you should be able to recover if you delete any files or folders beginning with distribute, easy-install, pip, pkg_resources, setuptools and site.
If that doesn't do the trick, uninstall any modules you can from that directory. For example use pip uninstall if you installed modules with pip. The reason to do this is that installation can copy files into usr/local/bin and other places that pip will remove for you.
Next it's time to remove any remaining modules. Rename the folder (in case there's something you want later) and make a new empty one.
Reinstall the modules you want and with a little luck you're back in business...

Martijn Pieter's answer is correct.
Go to http://pypi.python.org/pypi/setuptools#downloads
Download setuptools-0.6c11-py2.7.egg
From your downloads directory run: sudo ./setuptools-0.6c11-py2.7.egg
Done :-)