Python String islower() Method

​The islower() function checks if characters in a string are lowercase. If characters in the string are lowercase it will return the boolean value True. Otherwise, it will return the boolean value False.

 string.islower () 

Example:

# Define a variable made up of lowercase letters
string = "learn python with ahmed obaid"
#islower function call
result = string. islower() # returns True
# Print the result
print(result)
# Define a variable composed of lowercase and uppercase letters
string = "Learn Python with Ahmed Obaid"
#islower function call
result = string. islower() # returns False
# Print the result
print(result)
# Define a variable composed of uppercase letters
string = "LEARN PYTHON WITH AHMED OBAID"
#islower function call
result = string. islower() #undefined returns False
 # Print the result
 print(result)

 The output will be:

 True
 False
 False

 The islower() function always returns the boolean value True. If the string contains lowercase letters, numbers and symbols.

 Example:

 # Define a variable consisting of lowercase letters, numbers and symbols
 string = "@Ahmed Obaid 2023"
 #islower function call
 result = string. islower() # returns True
 # Print the result
 print(result)

 The output will be:

 True

 The islower() function always returns a boolean False if the string contains only symbols and numbers. Without lowercase letters.

 Example:

 # Define a variable composed of numbers and symbols
 string = "100$"
 #islower function call
 result = string. islower() # returns False
 # Print the result
 print(result)

 The output will be:

 False

 External sources:

 Built-in functions - official Python documentation

 If you have any questions or concerns, leave them in the comments