a 1 b 2 Common Python for loops. Here are some common objects used in a Python for loop: Lists. The example above shows how a list can be iterated over using a for loop. Note that if you have a ...

Many programs have a need to iterate over a large list of generated data. The conventional way to do this would be to calculate the values for the list and populate it, then loop over the whole thing.

By using the open() function and a simple loop, you can cycle through a list of file names and assign a variable with a reference to that file, storing it for later use. Create a list of file names.