### https://theweeklychallenge.org/blog/perl-weekly-challenge-287/
"""

Task 2: Valid Number

Submitted by: [43]Mohammad Sajid Anwar
     __________________________________________________________________

   You are given a string, $str.

   Write a script to find if it is a valid number.

   Conditions for a valid number:
- An integer number followed by an optional exponent.
- A decimal number followed by an optional exponent.
- An integer number is defined with an optional sign '-' or '+' followed by digi
ts.

   Decimal Number:
A decimal number is defined with an optional sign '-' or '+' followed by one of
the following definitions:
- Digits followed by a dot '.'.
- Digits followed by a dot '.' followed by digits.
- A dot '.' followed by digits.

   Exponent:
An exponent is defined with an exponent notation 'e' or 'E' followed by an integ
er number.

Example 1

Input: $str = "1"
Output: true

Example 2

Input: $str = "a"
Output: false

Example 3

Input: $str = "."
Output: false

Example 4

Input: $str = "1.2e4.2"
Output: false

Example 5

Input: $str = "-1."
Output: true

Example 6

Input: $str = "+1E-8"
Output: true

Example 7

Input: $str = ".44"
Output: true
     __________________________________________________________________

   Last date to submit the solution 23:59 (UK Time) Sunday 22nd September
   2024.
     __________________________________________________________________

SO WHAT DO YOU THINK ?
"""
### solution by pokgopun@gmail.com

def validNumber(string: str):
    try:
        assert float(string)
    except:
        return False
    return True

import unittest

class TestValidNumber(unittest.TestCase):
    def test(self):
        for inpt, otpt in {
                "1": True,
                "a": False,
                ".": False,
                "1.2e4.2": False,
                "-1.": True,
                "+1E-8": True,
                ".44": True,
                }.items():
            self.assertEqual(validNumber(inpt),otpt)

unittest.main()