How to add elements to a sub list in Python?

Question

Consider a list inside a list

list1 = ["element1","element2",["subelement1","subelement2"]]

subelement1 can be accessed by index [2][0]

print (list1[2][0])

But how can I insert elements at [2][x] position if only two parameters can be passed to insert function.

list.insert(index, element)

Lets say i want to insert "subelement0" at [2],[0]. That makes the list :

list1 = ["element1","element2",["subelement0","subelement1","subelement2"]]

you mean ["element1", "subelement1", "element2", "subelement2"]? — DirtyBit
– DirtyBit, Commented Dec 20, 2018 at 11:55

Andersson · Accepted Answer · 2018-12-20 11:55:59Z

2

Try to insert element to sublist as below:

list1[2].insert(0, 'subelement0') 
print(list1)
#  ['element1', 'element2', ['subelement0', 'subelement1', 'subelement2']]

answered Dec 20, 2018 at 11:55

Andersson

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Comments

Aybars · Accepted Answer · 2018-12-20 12:06:38Z

0

I would like to extend the answer posted by @Andersson. It would be nice to checking the type of the list element, then insert a new value.

def list_modify(element_to_add):
  list1 = ["element1", "element2", ["subelement1", "subelement2"]]
  for index, value in enumerate(list1):
      if isinstance(value, list):
          list1[index].insert(0, element_to_add)
  print(list1)
  #  ['element1', 'element2', ['subelement0', 'subelement1', 'subelement2']]
if __name__ == "__main__":
  list_modify('subelement0')

answered Dec 20, 2018 at 12:06

Aybars

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