ImportError: No module named bz2 for Python 2.7.2

问题:

I'm using Python 2.7.2 on Ubuntu 11.10. I got this error when importing the bz2 module:

ImportError: No module named bz2

I thought the bz2 module is supposed to come with Python 2.7. How can I fix this problem?

EDIT: I think I previously installed Python 2.7.2 by compiling from source. Probably at that point I didn't have libbz2-dev and so the bz2 module is not installed. Now, I'm hoping to install Python2.7 through

sudo apt-get install python2.7

But it will say it's already installed. Is there a way to uninstall the previous Python2.7 installation and reinstall?

回答1:

Okay, this is much easier to understand in answer form, so I'll move what I would write in my comment to this answer.

Luckily for you, you didn't overwrite the system version of python, as Ubuntu 11.10 comes with 2.7.2 preinstalled.

Your python binaries (python and python2.7) are located in /usr/local/bin, which is a directory where user-specific stuff is usually installed. This is fine, it means your system python is still there.

First, just try to run the system python. Type this from the command line:

/usr/bin/python -c "import bz2; print bz2.__doc__"

This should print out something like this:

λ > /usr/bin/python -c "import bz2; print bz2.__doc__"

The python bz2 module provides a comprehensive interface for
the bz2 compression library. It implements a complete file
interface, one shot (de)compression functions, and types for
sequential (de)compression.

If so, means you're fine.

So you just have to fix your PATH, which tells the shell where to find commands. /usr/local/bin is going to have priority over /usr/local, so there are some ways to fix this, in order of difficulty/annoyance/altering your system:

Remove the symlink python from /usr/local/bin

This will make it so that when you type python, it should go back to executing /usr/bin/python, which is an alias for the system's python 2.7.2.

sudo rm /usr/local/bin/python

---

Move /usr/bin to have higher precedence in the PATH

Might not be desirable if you already have stuff in /usr/local/bin that should have precedence over /usr/bin, but I'm adding this for completeness.

In your shell profile (not sure what Ubuntu's default is, but I'm using ~/.bash_profile, you can do this:

export PATH=/usr/bin:$PATH

---

Remove your python install

This is extreme and the first option I presented should be your first option.

Do you really need your own version of Python? If you want isolated python environments you probably really want virtualenv. You can probably remove yours unless there's a reason not to.

It's going to be a little annoying though, but basically:

• Remove the python and python2.7 and pythonw and pythonw2.7 commands from /usr/local/bin.
• Remove /usr/local/lib/python/2.7.2

This part is not complete because I forget what else there is.

回答2:

I meet the same problem, here's my solution.

The reason of import error is while you are building python, system couldn't find the bz2 headers and skipped building bz2 module.

Install them on Ubuntu/Debian:

sudo apt-get install libbz2-dev

Fedora:

sudo yum install bzip2-devel

and then rebuild python

comes from another answer

@birryree's answer helps to back to the system's original python.

回答3:

In case, you must be used python2.7, you should run: (Centos 6.4)

sudo cp /usr/lib64/python2.6/lib-dynload/bz2.so /usr/local/lib/python2.7/

回答4:

Maybe it will helps someone:

apt-get install libbz2-dev # for bz2
apt-get install libssl-dev # for _ssl
apt-get install libsqlite3-dev # for sqlite
apt-get install libreadline6-dev # for readline,  _curses,  _curses_panel

回答5:

For Ubuntu/Debian:

sudo apt-get install libbz2-dev

For Fedora:

sudo yum install bzip2-devel

And then recompile the python and install it.

回答6:

matocnhoi's answer works for me in centOS

sudo cp /usr/lib64/python2.6/lib-dynload/bz2.so /usr/local/lib/python2.7/

and I used virtualenv, so the command is

sudo cp /usr/lib64/python2.6/lib-dynload/bz2.so ../../../env/lib/python2.7/

回答7:

I used a symlink between /usr/lib64/python2.6/lib-dynload/bz2.so /usr/local/lib/python2.7/lib-dynload/

Worked fine for me...

回答8:

Make sure you bz2 installed, run sudo yum install bzip2-devel.

• Centos 6

  sudo cp /usr/lib64/python2.6/lib-dynload/bz2.so /python_install_path/lib/python2.7
  

• Centos 7

  sudo cp /usr/lib64/python2.7/lib-dynload/bz2.so /python_install_path/lib/python2.7
  

python_install_path usually is /usr/local/lib/python2.7/, you need replace that if you install python in a another path.

回答9:

If your bz2 in /usr/lib64/python2.7/lib-dynload/ is named as: "bz2.x86_64-linux-gnu.so", remember to rename it to bz2.so when copying it to your path or it may not be correctly sourced:

cp /usr/lib64/python2.6/lib-dynload/bz2.x86_64-linux-gnu.so /python_install_path/lib/python2.7/bz2.so

回答10:

I had the same problem with Python 2.17.15 and pyenv on Ubuntu. System python from /usr/bin/python worked fine. In my case it helped to install libbz2-dev and then to reinstall python 2.7.15:

sudo apt-get install libbz2-dev
pyenv uninstall 2.7.15
pyenv install 2.7.15