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Optional arguments

Name: Anonymous 2011-07-27 6:13



def find(str, ch, start=0):

  index = start

  while index < len(str):

    if str[index] == ch:

      return index

    index = index + 1

  return -1

Add a fourth parameter, end, that specifies where to stop looking. The default value of end should be len(str).

Name: Anonymous 2011-07-27 6:19

def find(str, ch, start=0, end=None):

  index = start

  if end is None:

    end = len(str)

  while index < len(str):

    if index > end:

      break

    if str[index] == ch:

      return index

    index = index + 1

  return -1

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