python中 __name__及__main()__

# module1.pydef pr():    print 'Hello world!'    if __name__=="__main__":        print "__name__==__main__"    if __name__=="module1":        print "__name__==__module1__"if __name__ == '__main__':    print "Now in module1"    pr()

输出结果：

Now in module1...Hello world!__name__==__main__

#module2.pyimport module1module1.pr()

输出结果：

Hello world!__name__==__module1__