Merge some list items in a Python List

Question

Say I have a list like this    a  b  c  d  e  f  g    How do modify that list so that it looks like this    a  b  c  def  g    I would much prefer that it modified the existing list directly  not created a new list

User · Answer

On what basis should the merging take place? Your question is rather vague. Also, I assume a, b, ..., f are supposed to be strings, that is, 'a', 'b', ..., 'f'.

>>> x = ['a', 'b', 'c', 'd', 'e', 'f', 'g']
>>> x[3:6] = [''.join(x[3:6])]
>>> x
['a', 'b', 'c', 'def', 'g']

Check out the documentation on sequence types, specifically on mutable sequence types. And perhaps also on string methods.

User · Answer

just a variation  alist   a    b    c    d    e   0   g   alist 3 6        join map str alist 3 6     print alist

User · Answer

my telepathic abilities are not particularly great  but here is what I think you want   def merge list of strings  indices       list of strings indices 0        join list of strings i  for i in indices      list of strings    s for i  s in enumerate list of strings  if i not in indices 1        return list of strings   I should note  since it might be not obvious  that it s not the same as what is proposed in other answers

User · Answer

Of course  Stephan202 has given a really nice answer  I am providing an alternative   def compressx min index   3  max index   6  x     a    b    c    d    e    f    g         x   x  min index        join x min index max index      x max index       return x compressx     gt  gt  gt   a    b    c    def    g     You can also do the following   x   x  min index        join x min index max index      x max index   print x    gt  gt  gt   a    b    c    def    g

User · Answer

That example is pretty vague  but maybe something like this   items     a    b    c    d    e    f    g    h   items 3 6        join items 3 6      It basically does a splice  or assignment to a slice  operation  It removes items 3 to 6 and inserts a new list in their place  in this case a list with one item  which is the concatenation of the three items that were removed    For any type of list  you could do this  using the   operator on all items no matter what their type is    items     a    b    c    d    e    f    g    h   items 3 6     reduce lambda x  y  x   y  items 3 6      This makes use of the reduce function with a lambda function that basically adds the items together using the   operator

[python] Merge some list items in a Python List

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