## Question

Asked By – Chris.Jie

Given the list `['a','ab','abc','bac']`

, I want to compute a list with strings that have `'ab'`

in them. I.e. the result is `['ab','abc']`

. How can this be done in Python?

**Now we will see solution for issue: Filtering a list of strings based on contents **

## Answer

This simple filtering can be achieved in many ways with Python. The best approach is to use “list comprehensions” as follows:

```
>>> lst = ['a', 'ab', 'abc', 'bac']
>>> [k for k in lst if 'ab' in k]
['ab', 'abc']
```

Another way is to use the `filter`

function. In Python 2:

```
>>> filter(lambda k: 'ab' in k, lst)
['ab', 'abc']
```

In Python 3, it returns an iterator instead of a list, but you can cast it:

```
>>> list(filter(lambda k: 'ab' in k, lst))
['ab', 'abc']
```

Though it’s better practice to use a comprehension.

This question is answered By – Eli Bendersky

**This answer is collected from stackoverflow and reviewed by FixPython community admins, is licensed under cc by-sa 2.5 , cc by-sa 3.0 and cc by-sa 4.0 **