Write a Python function that accepts a string and calculate the number of upper case letters and lower case letters

example 1:- 

def string_test(str):
    d={"UPPER_CASE":0, "LOWER_CASE":0}
    for c in str:
        if c.isupper():
           d["UPPER_CASE"]+=1
        elif c.islower():
           d["LOWER_CASE"]+=1
        else:
           pass
    print ("Original String : ", str)
    print ("No. of Upper case characters : ", d["UPPER_CASE"])
    print ("No. of Lower case Characters : ", d["LOWER_CASE"])
 
string_test('BlockChain')

output:-

Original String :  BlockChain
No. of Upper case characters :  2
No. of Lower case Characters :  8
>>> 

example 2:-

def up_low(s):      
    u = sum(1 for i in s if i.isupper())
    l = sum(1 for i in s if i.islower())
    print( "No. of Upper case characters : %s,No. of Lower case characters : %s" % (u,l))

up_low("Hello Mr. Rogers, how are you this fine Tuesday?")

output:-

No. of Upper case characters : 2,No. of Lower case characters : 8
>>> 

example 3:-

string = input ("Enter String : ")

upp = low = 0

for letter in string :

   if ord(letter) in range (65,91):

       upp = upp + 1

   elif ord(letter) in range (97,123):

       low = low + 1

print("upper-case letter are : ",upp,"\nlower-case letter are : ",low)

output:-

Enter String : BlockChain
upper-case letter are :  2 
lower-case letter are :  8
>>>