Find and replace string values in list

Question

I got this list   words     how    much    is br     the    fish br     no    really     What I would like is to replace  br  with some fantastic value similar to  amp lt br   amp gt  and thus getting a new list   words     how    much    is lt br   gt     the    fish lt br   gt     no    really

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You can use  for example   words    word replace   br     lt br   gt    for word in words

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An example with for loop  I prefer List Comprehensions    a  b     br      lt br   gt   for i  v in enumerate words       if a in v          words i    v replace a  b  print words      how    much    is lt br  gt     the    fish lt br  gt     no    really

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In case you re wondering about the performance of the different approaches  here are some timings   In  1   words    str i  for i in range 10000    In  2    timeit replaced    w replace  1     lt 1 gt    for w in words  100 loops  best of 3  2 98 ms per loop  In  3    timeit replaced   map lambda x  str replace x   1     lt 1 gt     words  100 loops  best of 3  5 09 ms per loop  In  4    timeit replaced   map lambda x  x replace  1     lt 1 gt     words  100 loops  best of 3  4 39 ms per loop  In  5   import re  In  6   r   re compile  1    In  7    timeit replaced    r sub   lt 1 gt    w  for w in words  100 loops  best of 3  6 15 ms per loop   as you can see for such simple patterns the accepted list comprehension is the fastest  but look at the following   In  8    timeit replaced    w replace  1     lt 1 gt    replace  324     lt 324 gt    replace  567     lt 567 gt    for w in words  100 loops  best of 3  8 25 ms per loop  In  9   r   re compile   1 324 567     In  10    timeit replaced    r sub   lt  1 gt    w  for w in words  100 loops  best of 3  7 87 ms per loop   This shows that for more complicated substitutions a pre-compiled reg-exp  as in 9-10  can be  much  faster  It really depends on your problem and the shortest part of the reg-exp

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words    w replace   br      lt br   gt    for w in words    These are called List Comprehensions

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Beside list comprehension  you can try map   gt  gt  gt  map lambda x  str replace x    br      lt br  gt     words    how    much    is lt br  gt     the    fish lt br  gt     no    really

[python] Find and replace string values in list

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