Filtering a list of strings based on contents

Question

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

User · Answer

Tried this out quickly in the interactive shell:

>>> l = ['a', 'ab', 'abc', 'bac']
>>> [x for x in l if 'ab' in x]
['ab', 'abc']
>>>

Why does this work? Because the in operator is defined for strings to mean: "is substring of".

Also, you might want to consider writing out the loop as opposed to using the list comprehension syntax used above:

l = ['a', 'ab', 'abc', 'bac']
result = []
for s in l:
   if 'ab' in s:
       result.append(s)

User · Answer

x for x in L if  ab  in x

User · Answer

This simple filtering can be achieved in many ways with Python  The best approach is to use  list comprehensions  as follows    gt  gt  gt  lst     a    ab    abc    bac    gt  gt  gt   k for k in lst if  ab  in k    ab    abc     Another way is to use the filter function  In Python 2    gt  gt  gt  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    gt  gt  gt  list filter lambda k   ab  in k  lst     ab    abc     Though it s better practice to use a comprehension

User · Answer

mylist     a    ab    abc   assert  ab  in mylist

User · Answer

To support matches from the beginning  not any matches   items     a    ab    abc    bac   prefix    ab   filter lambda x  x startswith prefix   items

[python] Filtering a list of strings based on contents

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