Convert a list to lowercase in Python
Lists can be used to store multiple items in a single variable. In Python, we can create a list of strings by enclosing the different elements in the list in single or double quotes.
This tutorial demonstrates how to convert a list of strings to lowercase in Python.
Convert a list of strings to lowercase in Python using str.lower()the function and loopfor
str.lower()Method is used to simply convert all the uppercase characters in a given string to lowercase characters and provide the result. Similarly, str.upper()method is used to reverse this process.
Apart from str.lower()the function, forloop is also used to iterate over all the elements in a given list of strings.
The following code uses str.lower()the function and fora loop to convert a list of strings to lowercase.
s = ["hEllO", "iNteRneT", "pEopLe"]
for i in range(len(s)):
s[i] = s[i].lower()
print(s)
Output:
['hello', 'internet', 'people']
map()Convert a list of strings to lowercase using the function in Python
Python provides a map()function that can be used to apply a specific process between given elements in any specified iterable object; this function returns an iterator itself as output.
A lambda function can be defined as a compact anonymous function that accepts any number of arguments and contains only one expression. In this method, lambda functions will also mapbe used with functions.
The following code uses map()the function and lambda function to convert a list of strings to lowercase in Python.
s = ["hEllO", "iNteRneT", "pEopLe"]
a = map(lambda x: x.lower(), s)
b = list(a)
print(b)
Output:
['hello', 'internet', 'people']
Convert a list of strings to lowercase using list comprehension in Python
List comprehension is a shorter way to create a list to be formed based on given values of an existing list. This method basically creates a new list where all items are lowercase.
The following code uses list comprehension to convert a list of strings to lowercase.
s = ["hEllO", "iNteRneT", "pEopLe"]
a = [x.lower() for x in s]
print(a)
Output:
['hello', 'internet', 'people']
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