For Loops

With the for loop we can execute a set of statements, once for each item in a list, tuple, set etc.

Example: Print each fruit in a fruit list:

The for loop does not require an indexing variable to set beforehand.

Even strings are iterable objects, they contain a sequence of characters:

Some Examples: Loop through the letters in the word "Johnny":

With the break statement we can stop the loop before it has looped through all the items:

Some Examples: Exit the loop when x is "cherry":

Some Examples: Exit the loop when x is "cherry", this time the break comes before the print:

With the continue statement we can stop the current iteration of the loop, and continue with the next:

Some Examples: Do not print apple:

To loop through a set of code a specified number of times, we can use the range() function

Some Examples: Using the range() function:

The range() function defaults to 0 as a starting value, however it is possible to specify the starting value by adding a parameter: range(2, 6), which means values from 2 to 6 (but not including 6):

Some Examples: Using the start parameter:

The range() function defaults to increment the sequence by 1, however it is possible to specify the increment value by adding a third parameter: range(2, 30, 3):

Some Examples: Increment the sequence with 3 (default is 1):

The else keyword in a for loop specifies a block of code to be executed when the loop is finished:

Some Examples: Print all numbers from 0 to 5, and print a message when the loop has ended:

The else block will NOT be executed if the loop is stopped by a break statement.

Some Examples: Break the loop when x is 3:

A nested loop is a loop inside a loop.

Some Examples: Print each adjective for every fruit:

You have learned For Loops in simple terms. Let's proceed on to Quiz.