如何下载python模块_如何在运行时安装和导入Python模块？

您可以导入pip而不是使用子进程&＃xff1a;

import pip

def install(package):

pip.main([&＃39;install&＃39;,package])

# Example

if __name__ &＃61;&＃61; &＃39;__main__&＃39;:

try:

import pexpect

except ImportError:

install(&＃39;pexpect&＃39;)

import pexpect

另一个需要&＃xff1a;

import pip

def import_with_auto_install(package):

try:

return __import__(package)

except ImportError:

pip.main([&＃39;install&＃39;,package])

return __import__(package)

# Example

if __name__ &＃61;&＃61; &＃39;__main__&＃39;:

pexpect &＃61; import_with_auto_install(&＃39;pexpect&＃39;)

print(pexpect)

[编辑]

您应该考虑使用requirements.txt和pip.好像你正试图自动化部署(这很好&＃xff01;),在我的工具带中我还有virtualenvwrapper,vagrant和ansible.

这是我的输出&＃xff1a;

(test)root&＃64;vagrant:~/test# pip uninstall pexpect

Uninstalling pexpect:

/usr/lib/python-environments/test/lib/python2.6/site-packages/ANSI.py

/usr/lib/python-environments/test/lib/python2.6/site-packages/ANSI.pyc

/usr/lib/python-environments/test/lib/python2.6/site-packages/FSM.py

/usr/lib/python-environments/test/lib/python2.6/site-packages/FSM.pyc

/usr/lib/python-environments/test/lib/python2.6/site-packages/fdpexpect.py

/usr/lib/python-environments/test/lib/python2.6/site-packages/fdpexpect.pyc

/usr/lib/python-environments/test/lib/python2.6/site-packages/pexpect-2.4-py2.6.egg-info

/usr/lib/python-environments/test/lib/python2.6/site-packages/pexpect.py

/usr/lib/python-environments/test/lib/python2.6/site-packages/pexpect.pyc

/usr/lib/python-environments/test/lib/python2.6/site-packages/pxssh.py

/usr/lib/python-environments/test/lib/python2.6/site-packages/pxssh.pyc

/usr/lib/python-environments/test/lib/python2.6/site-packages/screen.py

/usr/lib/python-environments/test/lib/python2.6/site-packages/screen.pyc

Proceed (y/n)? y

Successfully uninstalled pexpect

(test)root&＃64;vagrant:~/test# python test.py

Downloading/unpacking pexpect

Downloading pexpect-2.4.tar.gz (113Kb): 113Kb downloaded

Running setup.py egg_info for package pexpect

Installing collected packages: pexpect

Running setup.py install for pexpect

Successfully installed pexpect

Cleaning up...