Python – Convert Snake case to Pascal case

Sometimes, while working with Python Strings, we have problem in which we need to perform a case conversion of String. This a very common problem. This can have application in many domains such as web development. Lets discuss certain ways in which this task can be performed.

Input : geeks_for_geeks
Output : GeeksforGeeks

Input : left_index
Output : leftIndex

Method #1 : Using title() + replace()
This task can be solved using combination of above functions. In this, we first convert the underscore to empty string and then title case each word.

# Python3 code to demonstrate working of
# Convert Snake case to Pascal case
# Using title() + replace()

# initializing string
test_str = 'geeksforgeeks_is_best'

# printing original string
print("The original string is : " + test_str)

# Convert Snake case to Pascal case
# Using title() + replace()
res = test_str.replace("_", " ").title().replace(" ", "")

# printing result
print("The String after changing case : " + str(res))

Output :

The original string is : geeksforgeeks_is_best
The String after changing case : GeeksforgeeksIsBest

Method #2 : Using capwords()
The task of performing title case is performed using capwords() in this method.

# Python3 code to demonstrate working of
# Convert Snake case to Pascal case
# Using capwords()
import string

# initializing string
test_str = 'geeksforgeeks_is_best'

# printing original string
print("The original string is : " + test_str)

# Convert Snake case to Pascal case
# Using capwords()
res = string.capwords(test_str.replace("_", " ")).replace(" ", "")

# printing result
print("The String after changing case : " + str(res))

Output :

The original string is : geeksforgeeks_is_best
The String after changing case : GeeksforgeeksIsBest