On Sat, Oct 02, 2021 at 02:53:03AM -0000, Debashish Palit wrote:
> There is no need of a three_way_flag - just use a conditional
> expression instead of an if-elif-else block,
Of course you need a three way flag if your function returns a three way
flag. It returns False for ints, True for floats, and None for anything
else.
So the caller needs to handle three cases:
- your function returns True, so call float(s)
- your function returns False, so call int(s)
- your function returns None, so handle the string some other way.
How else could you do it?
> str.isfloat uses the int() and float() functions,
Correct, which is why your function is wasteful and inefficient. If I
call `isfloat('123')`, the function calls float, and throws the result
away, so I have to call float *again*. So if people use this function,
they are effectively doing:
s = '123.0' # input is a string, from somewhere else
float(s) # throw away the result
num = float(s)
> If int() raises overflow error
int() never raises OverflowError.
--
Steve
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