The `isdigit()` function in Python is a string method that checks if all the characters in a string are digits. It returns `True` if all characters are digits and there is at least one character, otherwise it returns `False`.
Syntax
string.isdigit()Example Here's an example to demonstrate how to use the `isdigit()` function:
```python # Example 1: All characters are digits s1 = "12345" print(s1.isdigit()) # Output: True # Example 2: Contains non-digit characters s2 = "12345a" print(s2.isdigit()) # Output: False # Example 3: Empty string s3 = "" print(s3.isdigit()) # Output: False # Example 4: String with spaces s4 = "123 456" print(s4.isdigit()) # Output: False # Example 5: Negative number (not considered a digit string) s5 = "-12345" print(s5.isdigit()) # Output: False ```Explanation 1. Example 1: The string `"12345"` contains only digit characters, so `s1.isdigit()` returns `True`. 2. Example 2: The string `"12345a"` contains a non-digit character (`'a'`), so `s2.isdigit()` returns `False`. 3. Example 3: The empty string `""` does not contain any characters, so `s3.isdigit()` returns `False`. 4. Example 4: The string `"123 456"` contains spaces, which are not digits, so `s4.isdigit()` returns `False`. 5. Example 5: The string `"-12345"` contains a minus sign, so `s5.isdigit()` returns `False`. Use Cases The `isdigit()` method is useful when you want to validate that a string consists solely of digit characters before performing operations that require numeric input.