Finding a substring within a list in Python

Question

Background  Example list  mylist     abc123    def456    ghi789   I want to retrieve an element if there s a match for a substring  like abc Code  sub    abc  print any sub in mystring for mystring in mylist   above prints True if any of the elements in the list contain the pattern  I would like to print the element which matches the substring  So if I m checking  abc  I only want to print  abc123  from list

User · Accepted Answer

print  s for s in list if sub in s    If you want them separated by newlines   print   n  join s for s in list if sub in s    Full example  with case insensitivity   mylist     abc123    def456    ghi789    ABC987    aBc654   sub    abc   print   n  join s for s in mylist if sub lower   in s lower

User · Answer

All the answers work but they always traverse the whole list  If I understand your question  you only need the first match  So you don t have to consider the rest of the list if you found your first match   mylist     abc123    def456    ghi789   sub    abc  next  s for s in mylist if sub in s   None    returns  abc123    If the match is at the end of the list or for very small lists  it doesn t make a difference  but consider this example   import timeit  mylist     abc123       xyz123   1000 sub    abc   timeit timeit   s for s in mylist if sub in s    setup  from   main   import mylist  sub   number 100000    for me 7 949463844299316 with Python 2 7  8 568840944994008 with Python 3 4 timeit timeit  next  s for s in mylist if sub in s   None    setup  from   main   import mylist  sub   number 100000     for me 0 12696599960327148 with Python 2 7  0 09955992100003641 with Python 3 4

User · Answer

I d just use a simple regex  you can do something like this  import re old list     abc123    def456    ghi789   new list    x for x in old list if re search  abc   x   for item in new list      print item

User · Answer

Use a simple for loop   seq     abc123    def456    ghi789   sub    abc   for text in seq      if sub in text          print text    yields  abc123

User · Answer

This prints all elements that contain sub   for s in filter  lambda x  sub in x  list   print  s

[python] Finding a substring within a list in Python

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