TypeError: list.append() takes exactly one argument (3 given)

This error occurs when you try to pass more than one argument to the `append()` method of a list. The `append()` method only takes one argument, which is the item you want to add to the end of the list.

For example, if you have a list called `my_list` and you want to add the integers 1, 2, and 3 to the end of the list, you might try to do it like this:

my_list = []
my_list.append(1, 2, 3)

However, this will result in a `TypeError` because you are passing three arguments to the `append()` method instead of just one.

To fix this error, you need to call the `append()` method once for each item you want to add to the list:

my_list = []
my_list.append(1)
my_list.append(2)
my_list.append(3)

Now the integers 1, 2, and 3 will be added to the end of the `my_list` list, and you will not get a `TypeError`.