Hi,
I'd like to know what is the best way to subclass str
I need to add some new methods and that each method (both new and str
ones) return my new type
For instance I've seen I can do:
class mystr(str):
def between(self, start, end):
i = self.index(start) + len(start)
j = self.index(end, i) + len(end)
return self[i:j], self[j:]
def replace(self, old, new='', count=-1):
return mystr(str.replace(self, old, new, count))
if __name__ == '__main__':
s = mystr('one two <three> four')
print s
print type(s)
b,r = s.between('<', '>')
print b
print r
print type(b)
print type(r)
c = s.replace('three', 'five')
print c
print type(c)
when I ran it I get:
one two <three> four
<class '__main__.mystr'>
three>
four
<type 'str'>
<type 'str'>
one two <five> four
<class '__main__.mystr'>
I guess that if I had redefined the slice method even 'between' would
have returned <class '__main__.mystr'>
I wonder if I have to redefine all methods one by one or if there is a
sort of hook to intercept all methods calls and just change the return
type
thanks
--
bye
!(!1|1)
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