CODEWITHSUNDEEP
pythonnested-loops
coding is hard
coding is hard

Reputation: 1

How to copy all items from a nested list to an empty nested list using for loops

I am currently trying to add all the items in a nested list, such as this one [['apple','orange','banana'],['jaguar','bear','octopus'],['spruce','pine','birch']], to an empty list of the same length, [ [] [] [] ]. For loops would be the best option I believe.

I cannot figure out where to start. I become very confused when working with nested lists and for loops

Upvotes: 0

Views: 37

Answers (2)

ncica
ncica

Reputation: 7206

probably you are searching how to do it with basic for loop:

data = [['apple','orange','banana'],['jaguar','bear','octopus'],['spruce','pine','birch']]
copy_data = [ [],[],[] ]

n = len(data)
for i in range(n):
    copy_data[i] = data[i]

print (copy_data)

output:

[['apple', 'orange', 'banana'], ['jaguar', 'bear', 'octopus'], ['spruce', 'pine', 'birch']]

Iterate over the list using for loop:

-Fist get the size of list

-Then iterate using for loop from 0 to len(data)

-In each iteration access iTh element from list data and add element to iTh element of list copy_data

Upvotes: 1

Error - Syntactical Remorse
Error - Syntactical Remorse

Reputation: 7887

May I recommend deepcopy:

from copy import deepcopy
x = [['apple', 'orange', 'banana'], ['jaguar', 'bear', 'octopus'], ['spruce', 'pine', 'birch']]
y = deepcopy(x)
print(x)
print(y)

These lists (x & y) are now completely different references.

Upvotes: 0

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