Check if string ends with one of the strings from a list

Question

What is the pythonic way of writing the following code   extensions      mp3    avi   file name    test mp3   for extension in extensions      if file name endswith extension            do stuff   I have a vague memory that the explicit declaration of the for loop can be avoided and be written in the if condition  Is this true

User · Answer

There is two ways  regular expressions and string  str  methods    String methods are usually faster    2x     import re  timeit p   re compile      mp3  avi     re IGNORECASE  file name    test mp3  print bool t match file name    timeit bool t match file name    792 ns    1 83 ns per loop  mean    std  dev  of 7 runs  1000000 loops each   file name    test mp3  extensions      mp3    avi   print file name lower   endswith extensions    timeit file name lower   endswith extensions    274 ns    4 22 ns per loop  mean    std  dev  of 7 runs  1000000 loops each

User · Answer

I have this   def has extension filename  extension        ext         extension     if filename endswith ext           return True     else          return False

User · Answer

Just use   if file name endswith tuple extensions

User · Answer

Another possibility could be to make use of IN statement   extensions      mp3    avi   file name     test mp3  if     in file name and file name file name rindex        in extensions      print True

User · Answer

I just came across this  while looking for something else    I would recommend to go with the methods in the os package  This is because you can make it more general  compensating for any weird case    You can do something like    import os  the file    aaaa bbbb ccc ddd   extensions list     ddd    eee    fff    if os path splitext the file  -1  in extensions list        Do your thing

User · Answer

another way which can return the list of matching strings is   sample    alexis has the control  matched strings   filter sample endswith    trol    ol    troll    print matched strings   trol    ol

User · Answer

Take an extension from the file and see if it is in the set of extensions    gt  gt  gt  import os  gt  gt  gt  extensions   set    mp3    avi     gt  gt  gt  file name    test mp3   gt  gt  gt  extension   os path splitext file name  1   gt  gt  gt  extension in extensions True   Using a set because time complexity for lookups in sets is O 1   docs

User · Answer

Though not widely known  str endswith also accepts a tuple  You don t need to loop    gt  gt  gt   test mp3  endswith    mp3     avi    True

[python] Check if string ends with one of the strings from a list

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