Something clear solution for Is String a Number? (Part II) by U.V - python coding challenges

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Something solution in Clear category for Is String a Number? (Part II) by U.V

def is_number(val: str) -> bool:
    if 'e' in val:
        return False
    try:
        float(val)
        return True
    except:
        return False

print("Example:")
print(is_number("10"))

# These "asserts" are used for self-checking
assert is_number("34") == True
assert is_number("df") == False
assert is_number("") == False
assert is_number("+10.0") == True
assert is_number("1OOO") == False
assert is_number("1.") == True
assert is_number("+.l") == False
assert is_number("++1+.2-") == False
assert is_number("3e4") == False

print("The mission is done! Click 'Check Solution' to earn rewards!")

Dec. 24, 2022

Comments:

kdim on Dec. 25, 2022, 2:32 a.m.
I think its extra code or not? <pre class='brush: python'> if 'e' in val: return False </pre>

U.V on Dec. 26, 2022, 8:38 a.m.
And what about math notation? "3e4" is a valid number . Try <h1>assert is_number("3e4") == False</h1>

oduvan on Jan. 2, 2023, 2:25 p.m.
`float("3e4")` doesn't raise an exception

U.V on Jan. 2, 2023, 2:42 p.m.
float("3e4") doesn’t raise an exception, but gives invalid result

oduvan on Jan. 2, 2023, 6:38 p.m.
in line 5 we don't use the result of the function

entreoutros on July 22, 2024, 2:01 a.m.
Nice idea to check if 'e' is in val! That's the only way a string can be converted to float without complying with the problem's rules. You can still make the code simpler, though. What do you think of this? <a href="https://py.checkio.org/mission/is-string-a-number-part-ii/publications/entreoutros/python-3/try-except-e-not-in-val/">https://py.checkio.org/mission/is-string-a-number-part-ii/publications/entreoutros/python-3/try-except-e-not-in-val/</a>

Strings Theory

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