How to convert a list of strings to lowercase

How to convert a list of strings to lowercase.

Here is a detailed step-by-step tutorial on how to convert a list of strings to lowercase:

Start by creating a list of strings that you want to convert to lowercase. Let's assume the list is called string_list and contains the following strings: "HELLO", "WORLD", "PYTHON".
Iterate through each string in the list. You can use a for loop to achieve this. Here's an example:
```
for i in range(len(string_list)):
```
Inside the loop, use the lower() method to convert each string to lowercase. The lower() method is a built-in function in Python that returns a lowercase version of a string. Assign the lowercase string back to the same index in the list. Here's the code to do this:
```
string_list[i] = string_list[i].lower()
```
This code accesses the string at the current index (i) in the list, applies the lower() method to convert it to lowercase, and assigns the lowercase version back to the same index in the list.
After the loop completes, the string_list will contain all the strings converted to lowercase.

Here's the complete code example:

string_list = ["HELLO", "WORLD", "PYTHON"]

for i in range(len(string_list)):
    string_list[i] = string_list[i].lower()

print(string_list)

Output:

['hello', 'world', 'python']

In this example, the original list string_list is modified in place to store the lowercase versions of the strings.

Alternatively, you can also use a list comprehension to achieve the same result in a more concise way:

string_list = ["HELLO", "WORLD", "PYTHON"]
string_list = [s.lower() for s in string_list]

print(string_list)

Output:

['hello', 'world', 'python']

Here, the list comprehension iterates over each string in string_list, applies the lower() method to convert it to lowercase, and creates a new list with the lowercase strings. The new list is then assigned back to string_list.

That's it! You now know how to convert a list of strings to lowercase using Python.