no module named zlib

Question

First  please bear with me  I have hard time telling others my problem and this is a long thread     I am using pythonbrew to run multiple versions of python in Ubuntu 10 10   For installing pythonbrew and how it works  please refers to this link below  http   www howopensource com 2011 05 how-to-install-and-manage-different-versions-of-python-in-linux   After reading a couple stackoverflow threads  I finally found the file called Setup under this directory      pythonbrew pythons Python-2 7 1 lib python2 7 config  In this Setup file I see    Andrew Kuchling s zlib module    This require zlib 1 1 3  or later     See http   www gzip org zlib    zlib zlibmodule c -I  prefix  include -L  exec prefix  lib -lz   I uncommented the last line  then I ran python -v again  However  I received the same error when I tried import zlib  so I guess I have to do something to install zlib into the lib    But I am clueless about what I need to do  Can someone please direct me in the right direction    Thank you very much   I am doing this because I want to use different version of python in different virtualenv I created   When I did  virtualenv -p python2 7 I received no module named zlib    jwxie518 jwxie518-P5E-VM-DO    virtualenv -p python2 7 --no-site-packages testenv  Running virtualenv with interpreter  home jwxie518  pythonbrew pythons Python-2 7 1 bin python2 7  Traceback  most recent call last     File   usr local lib python2 6 dist-packages virtualenv py   line 17  in  lt module gt      import zlib  ImportError  No module named zlib     EDIT  I have to install 2 7 1 by appending --force   I am developing Django  and I need some of these missing modules  for example sqlite3  and to create my virtualenv I definitely need zlib  If I just use the system default  2 6 6   I have no problem   To do this with system default  all I need to do is  virtualenv --no-site-packages testenv   Thanks       2nd edit   I installed 3 2 also and I tested it without problem  so I guess my problem comes down to how to install the missing module s    jwxie518 jwxie518-P5E-VM-DO    virtualenv -p python3 2  testenv Running virtualenv with interpreter  home jwxie518  pythonbrew pythons Python-3 2 bin python3 2 New python executable in testenv bin python3 2 Also creating executable in testenv bin python Installing distribute                                                                                                                                                                                                                                                                                                                                  done  Installing pip               done  jwxie518 jwxie518-P5E-VM-DO    virtualenv -p python3 2 --no-site-packages testenv Running virtualenv with interpreter  home jwxie518  pythonbrew pythons Python-3 2 bin python3 2 New python executable in testenv bin python3 2 Also creating executable in testenv bin python Installing distribute                                                                                                                                                                                                                                                                                                                                  done  Installing pip               done

User · Answer

The easiest solution I found  is given on python org devguide   sudo apt-get build-dep python3 6   If that package is not available for your system  try reducing the minor version until you find a package that is available in your system   s package manager   I tried explaining details  on my blog

User · Answer

Sounds like you need to install the devel package for zlib  probably want to do something like sudo apt-get install zlib1g-dev  I don t use ubuntu so you ll want to double-check the package   Instead of using python-brew you might want to consider just compiling by hand  it s not very hard  Just download the source  and configure  make  make install  You ll want to at least set --prefix to somewhere  so it ll get installed where you want     configure --prefix  opt python2 7   other options make make install   You can check what configuration options are available with   configure --help and see what your system python was compiled with by doing   python -c  import sysconfig  print sysconfig get config var  CONFIG ARGS      The key is to make sure you have the development packages installed for your system  so that Python will be able to build the zlib  sqlite3  etc modules  The python docs cover the build process in more detail  http   docs python org using unix html building-python

User · Answer

By default when you configuring Python source  zlib module is disabled  so you can enable it using option --with-zlib when you configure it  So it becomes     configure --with-zlib

User · Answer

I had a lot of problems making a virtual environment  venv  as described in the tensorflow installation guide   Most of the commands listed in this post didn t help me either so  if this is also your case this is what I did    pip3 install --user pipenv  pip install virtualenv   Installs the dependencies to create a virtual environment   mkdir myenv    Makes a new directory called myenv but you can call it whatever you want e g  mynewenv   cd myenv   Or whatever you call your directory so  cd  your directory name    virtualenv -p  usr bin python3 venv   Creates a virtual environment called venv in the folder myenv  You can call your virtual env whatever you like e g  vitualenv  v env name    source   venv bin activate   Activates the virtual environment  Note that if you choose a different v  env  name your commands should be written as such source    v env name  bin activate   deactivate   Deactivates the virtual environment   Note  I am using Python 3 6 6  amp  Ubuntu 18 04  source for the commands

User · Answer

My objective was to create a new Django project from the command line in Ubuntu  like so   django-admin py startproject mysite   I have python2 7 5 installed  I got this error   ImportError  No module named zlib   For hours I could not find a solution  until now   Here is a link to the solution -   http   doc biblissima-condorcet fr loris-setup-guide-ubuntu-debian   I followed and executed instruction in Section 1 1 and it is working perfectly  It is an easy solution

User · Answer

After you install the missing zlib dev package you can also use pythonbrew to uninstall and then reinstall the version of python you wanted and it seems like it picks up the new package to compile to correct abilities  This way you can keep using pythonbrew and don t have to do the compilation yourself  though it isn t that difficult

User · Answer

For the case I met  I found there are missing modules after make  So I did the following    install zlib-devel make and install python again

User · Answer

After running configure  you can change the config option in the file Modules Setup as below   zlib zlibmodule c -I  prefix  include -L  exec prefix  lib -lz   Or you can uncomment the zlib line as-is

[python] no module named zlib

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