We have string.isdigit(), why not string.isNumber()?
N00b question alert! I did a search for isdigit() in the group discussion, and it didn't look like the question had been asked in the first 2 pages, so sorry if it was... The manual documentation says: isdigit( ) Return true if all characters in the string are digits and there is at least one character, false otherwise. For 8-bit strings, this method is locale-dependent. So it makes sense that something like 5.6 would return false. But what if we want to make sure that our string is a valid number, ie decimals included? I know how to write a regexp or method or whatever to do this, my main question is *why* something like an isNumber() method is not baked into the class. Does such functionality exist somewhere else in the standard library that I'm just missing? -- http://mail.python.org/mailman/listinfo/python-list
Re: We have string.isdigit(), why not string.isNumber()?
In article [EMAIL PROTECTED], MooMaster [EMAIL PROTECTED] wrote: So it makes sense that something like 5.6 would return false. But what if we want to make sure that our string is a valid number, ie decimals included? Just call int(x) or float(x) inside a try block and see if if it raises an exception. -- http://mail.python.org/mailman/listinfo/python-list
Re: We have string.isdigit(), why not string.isNumber()?
On Apr 30, 7:56 pm, MooMaster [EMAIL PROTECTED] wrote: N00b question alert! I did a search for isdigit() in the group discussion, and it didn't look like the question had been asked in the first 2 pages, so sorry if it was... The manual documentation says: isdigit( ) Return true if all characters in the string are digits and there is at least one character, false otherwise. For 8-bit strings, this method is locale-dependent. So it makes sense that something like 5.6 would return false. But what if we want to make sure that our string is a valid number, ie decimals included? I know how to write a regexp or method or whatever to do this, my main question is *why* something like an isNumber() method is not baked into the class. Does such functionality exist somewhere else in the standard library that I'm just missing? A string s is a valid number if float(s) does not raise a ValueError. -- http://mail.python.org/mailman/listinfo/python-list
Re: We have string.isdigit(), why not string.isNumber()?
MooMaster [EMAIL PROTECTED] writes: I know how to write a regexp or method or whatever to do this, my main question is *why* something like an isNumber() method is not baked into the class. Because that name wouldn't conform to PEP 8. (Also, and more importantly, because it's more correct to use it as input to creating a new object of the type you want, and catch the exception if it fails.) -- \ Courage is resistance to fear, mastery of fear — not absence | `\ of fear. —Mark Twain, _Pudd'n'head Wilson_ | _o__) | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
