Steven D'Aprano wrote: > If you really wanted to waste CPU cycles, you could do this: > > s = "1579" > for c in s: > if not c.isdigit(): > print "Not an integer string" > break > else: > # if we get here, we didn't break > print "Integer %d" % int(s) > > > but notice that this is wasteful: first you walk the string, checking each > character, and then the int() function has to walk the string again, > checking each character for the second time. > Wasteful enough that there is a specific built-in function to do just this ?
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