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#演示文档字符串
#!/usr/local/bin/python2.5
'''I am this file's doc string,hehe!'''

def prt(x,y):
	'''I am doc string!
I hope you can remeber me'''
	
	'''I am testing'''
	
	print x,y  #I am tip too,please remeber I am diferent in version 3.0 
	
prt(1,2)
print prt.__doc__

import sys
print sys.__doc__

import if_exp
print if_exp.__doc__