CODEWITHSUNDEEP
pythonmultidimensional-array
MaxCoder63
MaxCoder63

Reputation: 25

What is the best way for me to print out a 2d array in python

I'm fairly new to coding, so this may seem like a bit of a silly question, however I am trying to print a 2d array grid and I'm not sure how I am supposed to do it. This is my code so far:

colA = [" ", " ", " ", " ", " "]
colB = [" ", " ", " ", " ", " "]
colC = [" ", " ", " ", " ", " "]
colD = [" ", " ", " ", " ", " "]
colE = [" ", " ", " ", " ", " "]

grid = [colA, colB, colC, colD, colE]

print("|"+[4,0]+"|"+[4,1]+"|"+[4,2]+"|"+[4,3]+"|"+[4,4]+"|")
print("|"+[3,0]+"|"+[3,1]+"|"+[3,2]+"|"+[3,3]+"|"+[3,4]+"|")
print("|"+[2,0]+"|"+[2,1]+"|"+[2,2]+"|"+[2,3]+"|"+[2,4]+"|")
print("|"+[1,0]+"|"+[1,1]+"|"+[1,2]+"|"+[1,3]+"|"+[1,4]+"|")
print("|"+[0,0]+"|"+[0,1]+"|"+[0,2]+"|"+[0,3]+"|"+[0,4]+"|")

It's basic, I know, but I just don't get it. When I try to print the grid, it comes up with this error message:

print("|"+[4,0]+"|"+[4,1]+"|"+[4,2]+"|"+[4,3]+"|"+[4,4]+"|")
TypeError: can only concatenate str (not "list") to str

What does this error message mean? Can I convert the 2d arrays into the strings they are in their respective lists without the console displaying something like: |[0,0]|[0,1]|[0,2]| etc.

Upvotes: 1

Views: 76

Answers (1)

Kavin Dsouza
Kavin Dsouza

Reputation: 979

Here's a simple code snippet to display a 2-D matrix in a 'pretty' way:

arr = [[1,2,'3'], [4,5,'trampoline'], ['rf', 'th', 8.7]]
print("\n".join(str(row) for row in arr))

Output:

[1, 2, '3']
[4, 5, 'trampoline']
['rf', 'th', 8.7]

It's essentially doing the following - [1, 2, '3'] + "\n" + [4, 5, 'trampoline'] + "\n" + ['rf', 'th', 8.7]

if you execute the above line, you'll get a similar error to the one you mentioned. (TypeError: must be str, not list)

Notice the str(row) in the code. By typecasting the list to a string, I am ensuring that concatenation happens between two string types only.

Upvotes: 1

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