Python string isalnum() function returns True if it’s made of alphanumeric characters only. A character is alphanumeric if it’s either an alpha or a number.
If the string is empty, then isalnum() returns False.
Syntax
string_name.isalnum()
Parameter
isalnum() method takes no parameters
Return Value
True: If all the characters are alphanumeric.
False: If one or more characters are not alphanumeric.
Python String isspace() Method
The isspace() method returns True if there are only whitespace characters in the string. If not, it return False.
Syntax
string.isspace()
Parameters
The isspace() method doesn't take any parameters.
Return Value
True- If all characters in the string are whitespace characters.
False- If the string contains 1 or more non-whitespace characters.
Python String islower() Method
The islower() methods returns “True” if all characters in the string are lowercase, Otherwise, It returns “False”.
This function is used to check if the argument contains any lowercase characters such as : abcdefghijklmnopqrstuvwxyz
Syntax :
string.islower()
Parameters:
islower() does not take any parameters
Returns :
True- If all characters in the string are lower.
False- If the string contains 1 or more non-lowercase characters.
Python String isupper() Method
The isupper() methods returns “True” if all characters in the string are uppercase, Otherwise, It returns “False”.
This function is used to check if the argument contains any uppercase characters such as : ABCDEFGHIJKLMNOPQRSTUVWXYZ
Syntax :
string.isupper()
Parameters:
isupper() does not take any parameters
Returns :
True- If all characters in the string are uppercase.
False- If the string contains 1 or more non-uppercase characters.
