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Suppose you want to write a program which has to keep track of the
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fileName = ''
while 1:
fileName = raw_input("Input a file name:")
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break
try:
f = file(fileName, 'r')
print 'Opened a file.'
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print 'There is no file named', fileName
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match    Match a regular expression pattern to the beginning of a string.
search   re.search(pattern, string, flags) flags:re.I re.M re.X re.S re.L re.U
sub      Substitute oc ......
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