[Python-ideas] String Subtraction (original) (raw)

Dj Gilcrease digitalxero at gmail.com
Fri Oct 15 05:22:59 CEST 2010

On Thu, Oct 14, 2010 at 7:45 PM, Bruce Leban <bruce at leapyear.org> wrote:

Here's a useful function along these lines, which ideally would be string.remove(): def remove(s, sub, maxremove=None, sep=None):  """Removes instances of sub from the string.  Args:  s: The string to be modified.  sub: The substring to be removed.  maxremove: If specified, the maximum number of instances to be  removed (starting from the left). If omitted, removes all instances.  sep: Optionally, the separators to be removed. If the separator appears  on both sides of a removed substring, one of the separators is removed.  >>> remove('test,blah,blah,blah,this', 'blah')  'test,,,,this'  >>> remove('test,blah,blah,blah,this', 'blah', maxremove=2)  'test,,,blah,this'  >>> remove('test,blah,blah,blah,this', 'blah', sep=',')  'test,this'  >>> remove('test,blah,blah,blah,this', 'blah', maxremove=2, sep=',')  'test,blah,this'  >>> remove('foo(1)blah(2)blah(3)bar', 'blah', 1)  'foo(1)(2)blah(3)bar'  """

Could be written as

def remove(string, sub, max_remove=-1, sep=None): if sep: sub = sub + sep return string.replace(sub, '', max_remove)

t = 'test,blah,blah,blah,this' print(remove(t, 'blah')) print(remove(t, 'blah', 2)) print(remove(t, 'blah', sep=',')) print(remove(t, 'blah', 2, ',')) print(remove('foo(1)blah(2)blah(3)bar', 'blah', 1))

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