动态修改python系统路径，动态python路径,默认情况下python会

动态修改python系统路径，动态python路径,默认情况下python会

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 doif __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

添加系统路径只要操作sys.path数组即可。