Have MySQLdb installed, works outside of virtualenv but inside it doesn't exist. How to resolve?

问题

I'm using the most recent versions of all software (Django, Python, virtualenv, MySQLdb) and I can't get this to work. When I run "import MySQLdb" in the python prompt from outside of the virtualenv, it works, inside it says "ImportError: No module named MySQLdb".

I'm trying to learn Python and Linux web development. I know that it's easiest to use SQLLite, but I want to learn how to develop larger-scale applications comparable to what I can do in .NET. I've read every blog post on Google and every post here on StackOverflow and they all suggest that I run "sudo pip install mysql-python" but it just says "Requirement already satisfied: mysql-python in /usr/lib/pymodules/python2.7"

Any help would be appreciated! I'm stuck over here and don't want to throw in the towel and just go back to doing this on Microsoft technologies because I can't even get a basic dev environment up and running.

回答1:

If you have created the virtualenv with the --no-site-packages switch (the default), then system-wide installed additions such as MySQLdb are not included in the virtual environment packages.

You need to install MySQLdb with the pip command installed with the virtualenv. Either activate the virtualenv with the bin/activate script, or use bin/pip from within the virtualenv to install the MySQLdb library locally as well.

Alternatively, create a new virtualenv with system site-packages included by using the --system-site-package switch.

回答2:

source $ENV_PATH/bin/activate
pip uninstall MySQL-python
pip install MySQL-python

this worked for me.

回答3:

I went through same problem, but using pip from virtualenv didn't solve the problem as I got this error

error: could not delete '/Library/Python/2.7/site-packages/_mysql.so': Permission denied

Earlier I had installed the package by sudo pip install mysql-python

To solve, copy files /Library/Python/2.7/site-packages/MySQL_python-1.2.5-py2.7.egg-info and /Library/Python/2.7/site-packages/_mysql* to ~/v/lib/python-2.7/site-packages and include /usr/local/mysql/lib in DYLD_LIBRARY_PATH env variable.

For the second step I am doing export DYLD_LIBRARY_PATH=/usr/local/mysql/lib in ~/.profile

来源：https://stackoverflow.com/questions/13288013/have-mysqldb-installed-works-outside-of-virtualenv-but-inside-it-doesnt-exist

标签

python

virtualenv

mysql-python