By using a `for`

construct with an `in`

operator we can iterate over a list, one value at a time. `number`

is an individual value referenced by a volatile variable.

```
from random import randint
>>> for i in range(11):
j = i * 10
k = (j + randint(0, 9)) % 10
print (j + k)
3
19
24
30
44
53
62
75
81
99
102
>>>
```

What we have effectively done is generate a random list of numbers, in a specified range for each. By using the initial range as a control then adding a random second digit.

The `in`

operator did all the work on the loop. It selected one value from the range at a time and let the computation revolve around that value.

Even more succinctly,

```
>>> for i in range(11):
print (i * 10 + randint(0, 9))
0
13
26
39
45
55
65
78
80
94
104
>>>
```

```
>>> def place_values(x):
for i in range(x):
print (i * 10 + randint(0, 9))
>>> place_values(10)
1
14
27
38
46
55
61
78
80
98
>>>
```