Lowercase in Python | String lower() Method

In Python, there are multiple ways to convert a string to lowercase. Following are a few of the most common methods:

Using the lower() method

The lower() method returns a string in all lowercase characters.

my_string = "Hello World" lowercase_string = my_string.lower() print(lowercase_string) # Output: "hello world"

Using the casefold() method

The casefold() method returns a string in all lowercase characters and is similar to lower(). The difference between them is that casefold() is more aggressive in its conversion and can handle certain characters that lower() cannot.

my_string = "Hello World" lowercase_string = my_string.casefold() print(lowercase_string) # Output: hello world

Using the str.lower() method

This method is similar to using lower() method, but instead of calling the method on the string itself, you can call it as a function of str class.

my_string = "Hello World" lowercase_string = str.lower(my_string) print(lowercase_string) # Output: "hello world"

Using the map() function

The map() function applies a function to each element of an iterable. you can use map() function to apply lower() method to each character of the string.

my_string = "Hello World" lowercase_string = ''.join(map(str.lower, my_string)) print(lowercase_string) # Output: "hello world"

Using a for loop

You can loop over each character in the string and convert it to lowercase.

my_string = "Hello World" lowercase_string = '' for char in my_string: lowercase_string += char.lower() print(lowercase_string) # Output: "hello world"

Using list comprehension

You can use list comprehension to create a new list of lowercase characters and join them together to form the new lowercase string.

my_string = "Hello World" lowercase_string = ''.join([char.lower() for char in my_string]) print(lowercase_string) # Output: "hello world"

All of the above methods will convert the string to lowercase in Python.

Lowercase first character of String in Python

To lowercase the first character of a string in Python, you can use the the lower() method.

my_string = "Hello World" lowercase_first_char = my_string[0].lower() + my_string[1:] print(lowercase_first_char) # Output: "hello world"

In the above example,take the first character of the string using slicing (my_string[:1]), convert it to lowercase using the lower() method, and concatenate it with the rest of the string (my_string[1:]). Note that the second letter of the string remains capitalized in this example.






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