# How to add a number to each element of a list in python ?

Published: April 04, 2019

Examples of how to add a number to each element of a list in python:

### Add a number to a list of integers

Add +10 to each integer of a list using a "list comprehension":

````>>> l2 = [i+10 for i in l]`
`>>> l2`
`[13, 11, 15, 18, 14]`
```

Increment a list of integer numbers:

````>>> l = [3,1,5,8,4]`
`>>> l2 = [i+1 for i in l]`
`>>> l2`
`[4, 2, 6, 9, 5]`
```

### Add a number to a list of reals

Increment a list of real numbers:

````>>> import numpy as np`
`>>> l = [i for i in np.arange(0,2,0.5)]`
`>>> l`
`[0.0, 0.5, 1.0, 1.5]`
`>>> [i+1 for i in l]`
`[1.0, 1.5, 2.0, 2.5]`
```

### Add a number to a list of strings

Add a number to a list of strings:

````>>> s2 = [i+str(10) for i in s]`
`>>> s2`
`['coucou10', 'hi10', 'hello10']`
```

Note: it is also possible to add a string to a list of strings:

````>>> s = ['coucou', 'hi', 'hello']`
`>>> s2 = [i+' aaa' for i in s]`
`>>> s2`
`['coucou aaa', 'hi aaa', 'hello aaa']`
```