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+### 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()