Python String islower() method
Python String islower() method checks if all characters in the string are lowercase. This method returns True if all alphabets in a string are lowercase alphabets. If the string contains at least one uppercase alphabet, it returns False.
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.
Example 1: Demonstrating the working of islower()
Python3
# Python3 code to demonstrate# working of islower()# initializing stringislow_str = "geeksforgeeks"not_islow = "Geeksforgeeks"# checking which string is# completely lowerprint ("Is geeksforgeeks full lower ? : " + str(islow_str.islower()))print ("Is Geeksforgeeks full lower ? : " + str(not_islow.islower())) |
Output:
Is geeksforgeeks full lower ? : True Is Geeksforgeeks full lower ? : False
Example 2: Practical Application
This function can be used in many ways and has many practical applications. One such application is checking for lower cases, checking proper nouns, checking for correctness of sentences that requires all lower cases. Demonstrated below is a small example showing the application of islower() method.
Python3
# Python3 code to demonstrate# application of islower() method# checking for proper nouns.# nouns which start with capital lettertest_str = "Geeksforgeeks is most rated Computer \ Science portal and is highly recommended"# splitting stringlist_str = test_str.split()count = 0# counting lower casesfor i in list_str: if (i.islower()): count = count + 1# printing proper nouns countprint ("Number of proper nouns in this sentence is : " + str(len(list_str)-count)) |
Output:
Number of proper nouns in this sentence is : 3
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