Program to Check if all Characters of String are Alphanumeric or Not

Check if alphanumeric python – Python Program to Check if all Characters of String are Alphanumeric or Not

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Check if alphanumeric python: In the previous article, we have discussed Python Program to Calculate EMI

isalnum() Method:

Check if alphanumeric python: The isalnum() Method is a String Class pre-defined method that can be used on any String Object. It returns Boolean Values based on the following criteria.

  • If all of the characters in the given string are Alphanumerical, it returns True.
  • If any of the characters in the given string are not Alphanumerical, this function returns False.

For Example:

Given string = “Hellobtechgeeks123”

Output: returns true since all the characters are alphabets and numbers.

Given string = “good morning@ #btechgeeks12345”

Output: returns False since all the given String contains some special symbols like #,@, and spaces.

Examples:

Example1:

Input:

Given string = "Hellobtechgeeks123"

Output:

The Given string { Hellobtechgeeks123 } is Alpha Numeric

Example 2:

Input:

Given string = "good morning@ #btechgeeks12345"

Output:

The Given string { good morning@ #btechgeeks12345 } is not Alpha Numeric

Program to Check if all Characters of String are Alphanumeric or Not

Check if string is alphanumeric python: Below are the ways to Check if all Characters of String are Alphanumeric or Not.

Method #1: Using isalnum() Method (Static input)

Approach:

  • Give the string as static input and store it in a variable.
  • Check whether the Given string is alphanumeric using the built-in alnum() method and store it in another variable.
  • Check whether the above result is True or not using the if conditional statement.
  • If it is True, Print the given string is alphanumeric.
  • If it is False, Print the given string that is not alphanumeric.
  • The Exit of the program.

Below is the implementation:

# Give the string as static input and store it in a variable.
gvn_strng = "Hellobtechgeeks123"
# Check whether the Given string is alphanumeric using built-in alnum() method
# and store it in another variable.
Bol_val = gvn_strng.isalnum()
# Check whether the above result is True or not using the if conditional statement.
if(Bol_val == True):
 # If it is True, Print the given string is  alphanumeric.
    print("The Given string {", gvn_strng, "} is Alpha Numeric")
else:
  # If it is False, Print the given string is not alphanumeric.
    print("The Given string {", gvn_strng, "} is not Alpha Numeric")

Output:

The Given string { Hellobtechgeeks123 } is Alpha Numeric

Method #2: Using isalnum() Method (User input)

Approach:

  • Give the string as user input using the input() function and store it in a variable.
  • Check whether the Given string is alphanumeric using the built-in alnum() method and store it in another variable.
  • Check whether the above result is True or not using the if conditional statement.
  • If it is True, Print the given string is alphanumeric.
  • If it is False, Print the given string that is not alphanumeric.
  • The Exit of the program.

Below is the implementation:

# Give the string as user input using the input()function and store it in a variable.
gvn_strng = input('Enter some random string = ')
# Check whether the Given string is alphanumeric using built-in alnum() method
# and store it in another variable.
Bol_val = gvn_strng.isalnum()
# Check whether the above result is True or not using the if conditional statement.
if(Bol_val == True):
 # If it is True, Print the given string is  alphanumeric.
    print("The Given string {", gvn_strng, "} is Alpha Numeric")
else:
  # If it is False, Print the given string is not alphanumeric.
    print("The Given string {", gvn_strng, "} is not Alpha Numeric")

Output:

Enter some random string = good morning @btechgeeks #123456
The Given string { good morning @btechgeeks #123456 } is not Alpha Numeric

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