how do I convert this java 2d array to python

Question

I have this 2d array in java

    String[][] Orders = new String[5000][7];

How do I create this in empty 2d array of strings in python?

I have tried

    Orders = [[]]

But when I go to put a value in it I get an index array out of bounds error

    Orders[0][0] = 'foo'
    Orders[0][1] = 'boo'

Highly likely that you won't need to initialize list if you'll use python in generic way. Pre-initialization is not required in 99% cases. Anyway, orders = [[""] * 7 for _ in range(5000)] — Olvin Roght
– Olvin Roght, Commented May 18, 2022 at 20:31
Orders: list[list[str]] = [] The type hint is not necessary. — Eric Jin
– Eric Jin, Commented May 18, 2022 at 20:31

againstchris · Accepted Answer · 2022-05-18 20:53:43Z

0

my_rows, my_cols = (3, 4)
my_array = [[0]*my_cols]*my_rows
print(my_array)

Link for reference https://pythonguides.com/create-an-empty-array-in-python/#:~:text=Create%20empty%20array%20Python,-In%20python%2C%20we&text=Create%20a%20list%20%5B0%5D%20and,will%20get%20an%20empty%20array.

edit: After further research multidimensional arrays do not seem as feasible in python as they are in Java

Here is a previous post on the topic: Two dimensional array in python

edited May 18, 2022 at 20:53

answered May 18, 2022 at 20:38

againstchris

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2 Comments

Olvin Roght Over a year ago

my_array will contain 4 references to same list of 3 zeros. Try to add my_array[0][0] = 1 and print my_array again and you will see the problem.

Sumit Sharma Over a year ago

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