Updated for-loop

[cyborglaksh]

Description of For-loop in python , the syntax and the cases in which we can use different stances

1. This pull request resolves #???

12

2. Description

Update the for-loop.py and added challenges regarding the tutorial

3. Fill in checklist by marking [x]

• [x] I've read the CONTRIBUTING.md
• [ ] I was assigned to this issue
• [x] My code is formatted using required linting
• [x] I've run my code locally and checked it works

[funbeedev]

@L-crypt looks good!