Solution Exercise 53 : python code to transform given a string into lowercase

Exercise 53

Using Exercise 51, create a python program as a function which takes as a parameter a string s and which returns the same string in lowercase without using the lower() method. You can use the chr() and ord() methods.

Solution

def toLowercase(s):
    # by using the exercise 51 we can obtain the lists of all upercase characters and lowercase characters:
    uppercase_characters = [chr(i) for i in range(65 , 91)]
    lowercase_characters =  [chr(i) for i in range(97 , 122)]
    # then we can obtain a lowercase characters from uppercase characters by adding 32 to its ascii code
    
    # initializing the searched string
    s_lower = ""
    for x in s:
        if x in uppercase_characters:
            x = chr(ord(x) + 32)
            s_lower = s_lower + x
        else :
            s_lower = s_lower + x
            
    return s_lower
print(toLowercase("PYTHON COURSES"))
# The output is : python courses