第18课，代码
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# this one is like your scripts with argv
def print_two (*args):
arg1, arg2 = args
print "arg1: %r, arg2: %r" % (arg1, arg2)
#ok, that *args is actually pointless, we can just do this
def print_two_again(arg1, arg2):
print "arg1: %r, arg2: %r" %(arg1, arg2)
#this just takes one argument
def print_one(arg1):
print "arg1: %r" % arg1
#this takes no arguments
def print_none():
print "I got nothin'. "
print_two("Zed","Shaw")
print_two_again("Zed", "Shaw")
print_one("First!")
print_none()
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逐条回溯，发现标红处的%遗漏。
重新运行，正常。
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