Task: Learning Journal

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Iteration Using definite count loops

There are two major types of loops in Python, for loops and while loops. If you want to repeat a certain number of times (definite count), you will normally use a for loop.

For example, a for loop can be used to print all student records since the computer knows exactly how many students there are.

For Loop Syntax

for variable in range(number):
    indented code goes here...

Using the range function

For loops will iterate through a sequence of numbers using the "range" function. The range function allows you to specify up to three values

range(start value, stop value, step value)

• The 'start value' is the value the for loop will start at (default value is 0)
• The 'stop value' is the value the for loop will stop at ( it will never include the stop value so if 5 is used it will stop when it gets to 5 )
• The 'stop value' is the only value that must always be delcared
• The 'step value' is the size of the increments for each loop, for example if the step value was 2 then the loop variable(iterator) would increase in value each time by 2 - (default value is 1)

Below is an example of a for loop using the range function with the start value set to stop value set to and the step value set to 1 (it increases by 1 each time).

Printing a range of numbers

You can use the range function in a for loop to print out numbers within a range you decide by setting both the start value and the stop value.

For example:

Why 8 and not 7? Well because our range will stop when it gets to the stop value

Python example:

Summing it all up

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Tick the one you feel is closest to your level