Basic_operations_with_TXT_file(Python)

a= open(r"C:\Users\user\Desktop\myfile.txt")
line1= a.readline()
total_uppercase_letters=0
total_lowercase_letters=0
for i in line1:
    if i.isupper():
        total_uppercase_letters+=1
    elif i.islower():
        total_lowercase_letters+=1

print("total no. of capital letters are :  ",total_uppercase_letters)
print("total no. of lower case letters are :  ",total_lowercase_letters)
a.close()