Writing a function to merge 2 lists...maybe more

Question

New to python... I am trying to write a function merge() to take two lists and combine them, and then I would like to expand that to an n number of lists.

The output I get from this code is only the grapes list and not concatenated with the apples list.

Failed Attempt with my fuction:

grapes = ['purple', 'red']
apples = ['green', 'yellow', 'orange']

def merge():
    ''' merge the lists '''
    for i in apples:
        grapes.append(i)
print("Concatenated list: " + str(grapes))

merge()

Output :

Concatenated list: ['purple', 'red']

Thank you for the read...

Well in your current case, you are outputting `grapes` before you're calling `merge` — Wondercricket, May 02 '22 at 20:01
Does this answer your question? [How do I concatenate two lists in Python?](https://stackoverflow.com/questions/1720421/how-do-i-concatenate-two-lists-in-python) — Stuart, May 02 '22 at 20:04
That's also worth checking https://stackoverflow.com/questions/11574195/how-to-merge-multiple-lists-into-one-list-in-python — Okroshiashvili, May 02 '22 at 20:04

score 0 · Answer 1 · answered May 02 '22 at 20:06

0

You should first call merge() before outputing grapes

I mean :

grapes = ['purple', 'red']
apples = ['green', 'yellow', 'orange']

def merge():
    ''' merge the lists '''
    for i in apples:
        grapes.append(i)

merge()
print("Concatenated list: " + str(grapes))

Or you could just do:

fruits = grapes + apples
print(fruits)

answered May 02 '22 at 20:06

MN.

67
7

I was specifically trying to write a function for this than manual concatenation, Thankyou for your answer! – Dead Musik May 02 '22 at 21:28
Please read [answer], and don't answer questions that boil down to simple typos or which are common duplicates. – Karl Knechtel Sep 07 '22 at 07:28

score -1 · Answer 2 · answered May 02 '22 at 20:07

Use this

array1 = ["a" , "b" , "c" , "d"]
array = [1 , 2 , 3 , 4 , 5]

def merge(*array_list):
  output_array = []
  for array in array_list:
    output_array = output_array + array
  return output_array

merged_array = merge(array1 , array2)

Hope it helps :)

Writing a function to merge 2 lists...maybe more

2 Answers2