Program purpose: determine whether the input value is an integer or a floating point number or a string
I wrote 3 solutions myself, but in the third solution, I used chatGBT to check, and it kept reminding me that substituting “-5” would be an error in judging it as float, but after I executed it myself, the result was always judged to be int, which is correct.??
(Environment IDE Spyder+ Python 3.12.4)
Please kindly give me some advice
ChatGPT doesn’t know Python. It’s just really good at talking.
Your code doesn’t do what you think it does. Try a few other examples on your third function and see what they do. Can you find a pattern? Try these inputs:
1
10
-1
1.5
a
q
spam
spam1
1spam
Do you notice how consistent your code is? Maybe that’s a clue.
First – in this forum, you want to make your code look like code, you do that by putting itside “fences” (or click the </> button in the UI: That will preserve theindentation which is critical – and make it look better …
First, the question is a bit unclear – input() always returns a string.
So what you want: is the input string a valid integer, or a valid float or another non-numeric string.
Second – there are essentially two ways to determine if a string contains an number:
examine the string, loook for valid characters (e.g. isdigit())
fairly easy for integers, more complex for floats
use the machinery built in to Python: try to make it a number, and see if that works.
You have actually done both of these in your code, but you only need to do one – you’ve realized that the minus sign (hyphen) is not a digit, so that has to be done separately anyway – in that case, you are using the "try to turn it into an int"approach – great – but then there’s no need for the isdigit call at all.
You’re close – but make it a simpler and more consistent (which is pretty much simply removing some code and you’ll have it.
/…/ Digits include decimal characters and digits that need special handling, such as the compatibility superscript digits. This covers digits which cannot be used to form numbers in base 10 /…/
This means that not all strings which pass .isdigit are convertible to int:
>>> "123".isdigit()
True
>>> "1²".isdigit()
True
>>> int("1²")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: invalid literal for int() with base 10: '1²'