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Python Program to Convert String to Uppercase

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In this article, we will show you, How to write a Python program to Convert String to Uppercase using upper(), For Loop, while loop, and ASCII with example.

TIP: Please refer String article to understand everything about Strings.

Python Program to Convert String to Uppercase using upper() Function

This python program allows the user to enter a string. Next, we used built-in string function called upper() to convert lowercase characters in a string to uppercase.

# Python Program to Convert String to Uppercase
 
string = input("Please Enter your Own String : ")

string1 = string.upper()
 
print("\nOriginal String in Lowercase  =  ", string)
print("The Given String in Uppercase =  ", string1)

OUTPUT

Python Program to Convert String to Uppercase 1

Python Program to Convert String to Uppercase using For Loop

This python program allows the user to enter a string. Next, it will find lowercase letters and covert them to uppercase.

First, we used For Loop to iterate characters in a String. Inside the For Loop, we are using If Else Statement to check whether the character is between a and z or not. If true, we are subtracting 32 from its ASCII value otherwise, we are coping that character to string 1.

TIP: Please refer ASCII Value of Total Characters article, and ASCII table to understand the ASCII values.

# Python Program to Convert String to Uppercase
 
string = input("Please Enter your Own String : ")
string1 = ''

for i in range(len(string)):
    if(string[i] >= 'a' and string[i] <= 'z'):
        string1 = string1 + chr((ord(string[i]) - 32))
    else:
        string1 = string1 + string[i]
 
print("\nOriginal String in Lowercase  =  ", string)
print("The Given String in Uppercase =  ", string1)

OUTPUT

Python Program to Convert String to Uppercase 2

Python Program to Convert String to Uppercase using While Loop

This python lowercase to uppercase conversion program is same as above. However, we just replaced the For Loop with While Loop.

# Python Program to Convert String to Uppercase
 
string = input("Please Enter your Own String : ")
string1 = ''
i = 0

while(i < len(string)): if(string[i] >= 'a' and string[i] <= 'z'):
        string1 = string1 + chr((ord(string[i]) - 32))
    else:
        string1 = string1 + string[i]
    i = i + 1
 
print("\nOriginal String in Lowercase  =  ", string)
print("The Given String in Uppercase =  ", string1)

OUTPUT

Python Program to Convert String to Uppercase 3

Python Program to Convert Lowercase String to Uppercase Example 4

This python string uppercase program is same as second example. However, we are using For Loop with Object

# Python Program to Convert String to Uppercase
 
string = input("Please Enter your Own String : ")
string1 = ''

for i in string:
    if(i >= 'a' and i <= 'z'):
        string1 = string1 + chr((ord(i) - 32))
    else:
        string1 = string1 + i
 
print("\nOriginal String in Lowercase  =  ", string)
print("The Given String in Uppercase =  ", string1)

OUTPUT

Python Program to Convert String to Uppercase 4

Python Program to Convert String to Uppercase using ASCII Values

In this program we are comparing the ASCII values to check whether there are any lowercase characters in this string. If true, we are converting them to uppercase.

# Python Program to Convert String to Uppercase
 
string = input("Please Enter your Own String : ")
string1 = ''

for i in string:
    if(ord(i) >= 97 and ord(i) <= 122):
        string1 = string1 + chr((ord(i) - 32))
    else:
        string1 = string1 + i
 
print("\nOriginal String in Lowercase  =  ", string)
print("The Given String in Uppercase =  ", string1)

OUTPUT

Python Program to Convert String to Uppercase 5