String Boolean functions in Python

Boolean methods – String validation methods:

String is an Object
String object is providing pre-defined methods to validate the string.
These methods are called Boolean methods, these methods always return a Boolean value (True or False)

Some of the methods :

s1 = "abc"
print(s1,"is alpha :", s1.isalpha())
print(s1,"is alpha numeric :", s1.isalnum())
print(s1,"is digit :", s1.isdigit())

Validate numerical string:

s1 = "1234"
print(s1,"is alpha :", s1.isalpha())
print(s1,"is alpha numeric :", s1.isalnum())
print(s1,"is digit :", s1.isdigit())

Validate Alpha Numeric String:

s1 = "abc123"
print(s1,"is alpha :", s1.isalpha())
print(s1,"is alpha numeric :", s1.isalnum())
print(s1,"is digit :", s1.isdigit())

s1 = "abc123$#"
print(s1,"is alpha numeric :", s1.isalnum())
print(s1,"is lower :", s1.islower())

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