**1.Introduction to For loop**

For loop is used to iterate over a sequence. With the help of for loop all the items present in the sequence are accessed one by one.

**2.Trick to solve nested loop questions in a easy way**

Let first for loop condition to be Days & other loop conditions to be sessions. That basically means that a student has to sit in all sessions everyday.

For example-

```
for i in range(3):
for j in range(6):
print(j, end=' ')
```

**TRICK TO SOLVE ABOVE QUESTION**:

Let i = Days(Monday, Tuesday, etc..) &

j = Sessions(Mathematics, Science, etc..)

range for i = (0,1,2)

range for j = (0,1,2,3,4,5)

Iteration1:

i=0, condition become True and loop will be connected

Day will be Monday. There are 6 sessions in j and a student has to sit in all sessions every day.

So, result will come to be 0 1 2 3 4 5

Iterations3:

i = 2, condition become True and day will be Wednesday. Result = 0 1 2 3 4 5

**Final output**

0 1 2 3 4 5 0 1 2 3 4 5 0 1 2 3 4 5

Example 2:

```
my_string =['Mathematics','Science','History']
for i in range(len(my_string)):
for x in range(4):
print(x, end=(' '))
```

**Explanation:**

Iteration1:

Range for i = (0,1,2)

Range for x = (0,1,2,3)

i = 0,Day 1 i.e Monday ,we have to sit in all sessions So, output become 0 1 2 3

Iteration3:

i = 2, Day 3 is Wednesday and after sitting in all sessions, output comes out to be 0 1 2 3.

**Final output**

0 1 2 3 0 1 2 3 0 1 2 3

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