Malcolm Greene wrote:
> What is the Pythonic way to remove specific chars from a string? The
> .translate( table[, deletechars]) method seems the most 'politically
> correct' and also the most complicated.
Most 'correct' and also by far the fastest. This recipe makes it a bit
easier to use:
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/303342
Just a couple of days ago I needed a function to determine the number of significant digits in a real number. It also involves the removal of specific chars from a string, but not all at once. (It ignores the implicit assumption that the digits at the end of the remaining string are actually significant.) This is what I came up with. It works, but could it be improved?
def sigDigits(n):
"""
Strips any real decimal (as string) to just its significant digits,
then returns its length, the number of significant digits.
Examples: "-345" -> "345" -> 3;
"3.000" -> "3000" -> 4
"0.0001234" -> "1234" -> 4;
"10.0001234" -> "100001234" -> 9
"7.2345e+543" -> "72345" -> 5
"""
s = str(n).lstrip("-+0")
s = s.lstrip(".")
s = s.lstrip("0")
s = s.lstrip(".")
s = s.replace(".", "")
if "e" in s:
s = s.rstrip("+-0123456789")
s = s.rstrip("e")
return len(s)
Thanks,
Dick Moores
UliPad <<The Python Editor>>: http://code.google.com/p/ulipad/
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