In Python, strings are a sequence of characters. The isnumeric() method is a built-in method that can be used to check whether a given string contains only numeric characters or not. A numeric character can be a digit from 0-9, or a character from other number systems like Arabic, Roman numerals, and others.
Syntax
The syntax of the isnumeric() method is as follows:
string.isnumeric()
Here, string is the string that we want to check for numeric characters.
Return Value
The isnumeric() method returns True if all the characters in the string are numeric. Otherwise, it returns False.
Examples
Here are three different examples of how to use the isnumeric() method in Python:
Example 1: Checking if a String is Numeric
The following example demonstrates how to use the isnumeric() method to check if a given string contains only numeric characters:
string = "12345" result = string.isnumeric() print(result)
Output:
True
In this example, we define a string “12345” and use the isnumeric() method to check whether it contains only numeric characters. Since all the characters in the string are numeric, the method returns True.
Example 2: Checking if a String is Not Numeric
The following example demonstrates how to use the isnumeric() method to check if a given string contains non-numeric characters:
string = "1234abc" result = string.isnumeric() print(result)
Output:
False
In this example, we define a string “1234abc” and use the isnumeric() method to check whether it contains only numeric characters. Since the string contains non-numeric characters, the method returns False.
Example 3: Checking if a String is Numeric in a Different Number System
The following example demonstrates how to use the isnumeric() method to check if a given string contains only numeric characters in a different number system, such as Arabic or Roman numerals:
string = "ⅤⅠⅠ" result = string.isnumeric() print(result)
Output:
True
In this example, we define a string “ⅤⅠⅠ” which represents the Roman numeral “7”, and use the isnumeric() method to check whether it contains only numeric characters. Since the string contains only numeric characters, the method returns True.
Use Cases
The isnumeric() method can be useful in a variety of scenarios, such as:
- Validating user input to ensure that it only contains numeric characters
- Checking if a given string represents a numeric value before converting it to a number
- Extracting numeric data from textual data sources, such as web pages or log files
- Filtering out non-numeric characters from a string
Overall, the isnumeric() method provides a convenient and easy way to check whether a given string contains only numeric characters or not.
