Check if all letter is uppercase or lowercase python, if there is one word in string is different print none

Question

For input string S, print UPPER if string S contains only uppercase characters (may contain spaces), LOWER if string S contains only lowercase characters (may contain spaces), otherwise print out NONE.

so here is my code

test_str = input()

  
res = "LOWER"
for ele in test_str:
  
    # checking for uppercase character and flagging
    if ele.isupper():
        res = "UPPER"
        break

print(str(res))

But if a word is neither lowercase nor uppercase, it doesn't None. How can I solve this?

Answer 1

No need for loops here. Just simply use the functions isupper() and islower() in an if-elif block, and add an else block to take care of mixed case (i.e., print out None or NONE), like so:

test_str = input()
    
if test_str.isupper():
    print('UPPER')
elif test_str.islower():
    print('LOWER')
else:
    print(None) # or print('NONE')

Example input/output:

HELLO USER
UPPER

HELLO UsER    
None 

hello user  
LOWER

hello User
None 

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