## Lists and Loops

There are two ways to loop over a list. The first way uses the `in` keyword, which can be used to check if a particular value is in a list, or to loop over the elements one at a time:
```numbers = [6, 8, 2, 9, 7]

print(6 in numbers) # True
print(0 in numbers) # False

for number in numbers:
print(number)
# prints 6, 8, 2, 9, 7
```
The second way uses the `range` and `len` functions to loop over the list indexes, which is needed when changing the values in a list:
```numbers = [6, 8, 2, 9, 7]

for i in range(len(numbers)):
numbers[i] = numbers[i] ** 2

print(numbers)
# [36, 64, 4, 81, 49]
```

### Exercise 1 of 6

Write a condition to check if a list called numbers contains the number 5.

### Exercise 2 of 6

Write a condition to check if a list called names contains the value "Jude".

### Exercise 3 of 6

Write the start of the loop to iterate over the list of numbers.
```numbers = [1, 2, 3, 4, 5, 6]
# start of loop here
print(number / 2)
```

### Exercise 4 of 6

Say hello to each person in the list.
```names = ["James", "Nicole", "Helen", "Troy"]
```

### Exercise 5 of 6

Write the start of the loop to replace each element in the list with a number twice its size.
```numbers = [1, 2, 3, 4, 5]
# start of loop here
numbers[i] = numbers[i] * 2
print(numbers)
```

```names = ["James", "Nicole", "Helen", "Troy"]