How would you implement a for loop

Question

How does it work

Answer 1

The for loop is another while loop essentially. You'd traditionally use it for a definite number of actions, eg calling a function (though this can be achieved through recursion, it's much simpler to read and Py focuses on readability). Say you wanted to do something a specific number of times and access an array(list) element, for is a very simple way to iterate through a list.

Answer 2

for loops are VERY useful once you understand them.

for i in range(5):
print(i)

output:
0
1
2
3
4

What's happening is

for ............ Declare the start of a for loop

i ................ This is just a variable name. Like variables, it can be named anything. i is typical.

in range() . Just one of many ways to choose the number of times to run the loop. Unlike a while loop that runs indefinitely, for loops generally run a set amount of times.

myList=["A","B","C"]

for i in myList:
print(i)

output:
A
B
C

Another typical use of for loops is to iterate thru a list. Like above.

for i in range(5):
print("*"*i)

output:
*
**
***
****

They are fun