Python: create a variable format string for 2D Array

Question

I am going currently through the book Supercharged Python and there is one problem, that I would like to try to optimize. I want to create a string for.format for a variable size of a 2D array.

def print_2dArray_opt(lst: list):
    width = 1
    row_string = '' 

    for r in lst:
        for c in r:
            temp = len(str(c))
            row_string = row_string + '{:{w}}' + ' ' 
            if temp > width:
                width = temp
        row_string = row_string + '\n'

    print(row_string.format(lst, w = width)) # That of course doesn't work


print_2dArray_opt([[1, 10, 100, 200],
                   [1, 10, 100, 200],
                   [1, 10, 100, 200],
                   [1, 10, 10000, 200]
                   ])

But I can't figure out how to formulate that print statement so that it can work. Any suggestions?

Answer 1

try this format style

f'{c:{width}}'

so fixed_code:

def print_2dArray_opt(lst: list):
    width = 1
    row_string = '' 

    for r in lst:
        for c in r:
            temp = len(str(c))             
            if temp > width:
                width = temp

            row_string = row_string + (f'{c:{width}}').strip() + ' '

        row_string = row_string + "\n"

    print(row_string.strip())


print_2dArray_opt([[1, 10, 100, 200],
                [1, 10, 100, 200],
                [1, 10, 100, 200],
                [1, 10, 10000, 200]
                ])