Will McGugan wrote:
> Hi,
>
> Is there a simple way of replacing a large number of substrings in a
> string? I was hoping that str.replace could take a dictionary and use it
> to replace the occurrences of the keys with the dict values, but that
> doesnt seem to be the case.
You can look at the re.sub [1] and try:
d={'a':'x', 'b':'y'}
def repl(match):
return d.get(match.group(0), '')
print re.sub("(a|b)", repl, "a b c")
> >>> dict_replace( "a b c", dict(a="x", b="y") )
> "x y c"
Above, I gave the pattern myself but you can try to have it generated
from the keys:
def dict_replace(s, d):
pattern = '(%s)'%'|'.join(d.keys())
def repl(match):
return d.get(match.group(0), '')
return re.sub(pattern, repl, s)
On your example, I get:
>>> dict_replace('a b c', {'a': 'x', 'b': 'y'})
'x y c'
>>>
[1] http://python.org/doc/2.4.1/lib/node114.html
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