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

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

User · Answer

mylist     a    ab    abc   assert  ab  in mylist

User · Answer

x for x in L if  ab  in x

User · Answer

Tried this out quickly in the interactive shell    gt  gt  gt  l     a    ab    abc    bac    gt  gt  gt   x for x in l if  ab  in x    ab    abc    gt  gt  gt    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

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

[python] Filtering a list of strings based on contents

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