Change language

Python String | islower () method

| |

Python has many helper functions in its libraries that always help us with some day to day tasks. Let’s see how the string islower () method works which actually checks if all characters in the string are lowercase.

Syntax: string .islower ()

Parameters: None

Returns: True if all the letters in the string are in lower case and False if even one of them is in upper case.

Code # 1: Demonstration of islower ()

# Python3 demo code
# islower () working

 
# initialization string

islow_str = " pythonengineering "

not_islow = "Geeksforgeeks"

 
# check which line
# completely below

print ( "Is pythonengineering full lower? : " + str (islow_str.islower ()))

print ( "Is Geeksforgeeks full lower?: " + str (not_islow.islower ()))

Exit:

 Is pythonengineering full lower?: True Is Geeksforgeeks full lower?: False 

Practical use: This function can be used in many ways and has many practical uses. such applications are lowercase validation, proper name validation, sentence validation, which requires all lowercase letters. Below is a small example demonstrating the use of the islower () method.

Code # 2: Practical Demonstration islower () method

# Python3 demo code
# using the islower () method

 
# check proper names.
# capitalized nouns

 

test_str = " Geeksforgeeks is most rated Computer

Science portal and is highly recommended "

  
# line splitting

list_str = test_str.split ()

 

count = 0

 
# counting lowercase

for i in list_str:

if (i.islower ()):

  count = count + 1

 
# print proper nouns

print ( "Number of proper nouns in this sentence is:"

+ str ( len (list_str) - count))

Output:

 Number of proper nouns in this sentence is: 3 

Shop

Learn programming in R: courses

$

Best Python online courses for 2022

$

Best laptop for Fortnite

$

Best laptop for Excel

$

Best laptop for Solidworks

$

Best laptop for Roblox

$

Best computer for crypto mining

$

Best laptop for Sims 4

$

Latest questions

NUMPYNUMPY

Common xlabel/ylabel for matplotlib subplots

12 answers

NUMPYNUMPY

How to specify multiple return types using type-hints

12 answers

NUMPYNUMPY

Why do I get "Pickle - EOFError: Ran out of input" reading an empty file?

12 answers

NUMPYNUMPY

Flake8: Ignore specific warning for entire file

12 answers

NUMPYNUMPY

glob exclude pattern

12 answers

NUMPYNUMPY

How to avoid HTTP error 429 (Too Many Requests) python

12 answers

NUMPYNUMPY

Python CSV error: line contains NULL byte

12 answers

NUMPYNUMPY

csv.Error: iterator should return strings, not bytes

12 answers

News


Wiki

Python | How to copy data from one Excel sheet to another

Common xlabel/ylabel for matplotlib subplots

Check if one list is a subset of another in Python

sin

How to specify multiple return types using type-hints

exp

Printing words vertically in Python

exp

Python Extract words from a given string

Cyclic redundancy check in Python

Finding mean, median, mode in Python without libraries

cos

Python add suffix / add prefix to strings in a list

Why do I get "Pickle - EOFError: Ran out of input" reading an empty file?

Python - Move item to the end of the list

Python - Print list vertically