怎么改python系统路径_动态修改python系统路径

默认情况下python会在模块运行的当前目录和环境变量中配置的目录中扫描模块。

我们也可以在程序中动态添加系统路径。

def AddSysPath(new_path):

import sys, os

# standardise

new_path = os.path.abspath(new_path)

# MS-Windows does not respect case

if sys.platform == 'win32':

new_path = new_path.lower()

# disallow bad paths

do = -1

if os.path.exists(new_path):

do = 1

# check against all paths currently available

for x in sys.path:

x = os.path.abspath(x)

if sys.platform == 'win32':

x = x.lower()

if new_path in (x, x + os.sep):

do = 0

# add path if we don't already have it

if do:

sys.path.append(new_path)

pass

return do

if __name__ == '__main__':

# test

import sys

print 'Before:'

for x in sys.path:

print x

if sys.platform == 'win32':

print AddSysPath('c:\\\\Temp')

print AddSysPath('c:\\\\temp')

else:

print AddSysPath('usr/lib/my_modules')

print 'After:'

for x in sys.path:

print x