Lesson 7 - For Loops

For Loops are great for making a limited number of loops as they will save you some lines of code.

Check out the program below, try to predict what the output will be and then type it up and try it.

There are 4 examples of For Loops listed.

Note that \n causes a return space when you are printing!

Example 1 : for i in range (10):

• This makes a loop of 10 times for anything indented below the code
• You can change the number of loops by just changing the number in the brackets
• This is handy for using one line of code to repeat something a certain number of times
• This is the equivalent of the Repeat block in Scratch
• This prints i, which is the variable it will use to keep track of the count

Example 2 : for i in range (10,0,-1):

• What's important is what is in the bracket.
• The first number = the number that you set the variable "i" to
• The second number = what i equals to exit out of the loop
• The third number = the adjustment to the variable "i" on every loop. In this case, you subtract 1 each time you loop. You can make this -2 to count down by 2's. You can make this + 5 to count up by 5's.

Example 3 : for i in range (0, 10, 2):

• This counts from 0 to 10, up by 2's and uses the variable range to keep track of the count

Example 4 : for i in range (10):

• This is just to show you can have other stuff inside the for loop other than print i. You can have whatever you want in there!

NOTE: The variable you use to count can be any legal variable name. It does not have to be i.

Assignment #7 :

Create a program that gives the EXACT output as shown below.

The program can ONLY use for loops for counting!

BONUS: the program, including your name in comments, is 4 lines!