Python Append item to list N times

Question

This seems like something Python would have a shortcut for  I want to append an item to a list N times  effectively doing this   l      x   0 for i in range 100       l append x    It would seem to me that there should be an  optimized  method for that  something like   l append multiple x  100    Is there

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I had to go another route for an assignment but this is what I ended up with   my array      x    repeated times

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l      x   0 l extend  x  100

User · Answer

You could do this with a list comprehension  l    x for i in range 10

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Itertools repeat combined with list extend   from itertools import repeat l      l extend repeat x  100

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For immutable data types   l    0    100    0  0  0  0  0        l     foo     100     foo    foo    foo    foo          For values that are stored by reference and you may wish to modify later  like sub-lists  or dicts    l       for x in range 100      The reason why the first method is only a good idea for constant values  like ints or strings  is because only a shallow copy is does when using the  lt list gt   lt number gt  syntax  and thus if you did something like      100  you d end up with 100 references to the same dictionary - so changing one of them would change them all  Since ints and strings are immutable  this isn t a problem for them    If you want to add to an existing list  you can use the extend   method of that list  in conjunction with the generation of a list of things to add via the above techniques    a    1 2 3  b    4 5 6  a extend b    a is now  1 2 3 4 5 6

User · Answer

Use extend to add a list comprehension to the end   l extend  x for i in range 100      See the Python docs for more information

[python] Python: Append item to list N times

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