For loop in python

Question

The for loop is too confusing it assigns checks and increase without stating any code. Can someone explain.

Answer 1

It just counts through each item in an iterable (lists, tuples, range objects, strings):
for item in [4, 8, 2]:
"run"

- item = 4
- "run"
- item = 8
- "run"
- item = 2
- "run"
- break

Other programming languages also have a similar for loop (foreach loop), that is used to count through arrays similarly.

Answer 2

You can also use the range function.
Range function takes three arguments. Third argument is optional.

First argument is the starting value of a loop.
Second argument is the ending value of a loop.
Third argument is the step count.

for i in range(0, 6):
print i

Output:
0
1
2
3
4
5

Remember that the first argument is inclusive but the second argument is exclusive. That's why it started from 0 and ended at 5.
By default, third argument has a value 1.

for i in range(0, 7, 2):
print i

Output:
0
2
4
6

Now we passed third argument with value of 2.
So after each iteration, 2 will be added to the value of i.