Table Printer excercise I'm new to Python and I came to the following excercise:


  Write a function named printTable() that takes a list of lists of
  strings and displays it in a well-organized table with each column
  right-justified. Assume that all the inner lists will contain the same
  number of strings. For example, the value could look like this:

tableData = [['apples', 'oranges', 'cherries', 'banana'],
             ['Alice', 'Bob', 'Carol', 'David'],
             ['dogs', 'cats', 'moose', 'goose']]

  
  Your printTable() function would print the following:

  apples Alice  dogs
 oranges   Bob  cats
cherries Carol moose
  banana David goose



My solution is this:

table_printer.py

tableData = [['apples', 'oranges', 'cherries', 'banana'],
             ['Alice', 'Bob', 'Carol', 'David'],
             ['dogs', 'cats', 'moose', 'goose']]

def printTable(tableData):
    """
    Print table neatly formatted:
    e.g:

    [['apples', 'oranges', 'cherries', 'banana'],
    ['Alice', 'Bob', 'Carol', 'David'],
    ['dogs', 'cats', 'moose', 'goose']]

    becomes:

      apples Alice  dogs
     oranges   Bob  cats
    cherries Carol moose
      banana David goose
    """
    # make list of ints to store later max len element of each list
    colWidths = [0] * len(tableData)

    # Store maxlen of each list
    i = 0
    while i &lt; len(tableData):
        colWidths[i] = len(max(tableData[i], key=len))
        i = i + 1

    # Print formatted
    for x in range(len(tableData[0])):
        for y in range(len(colWidths)):
            print(tableData[y][x].rjust(colWidths[y]), end=' ')
        print(end='\n')

printTable(tableData)


I wonder if this is a good solution or if there is an easier/better way. It took me quite some time to come up with a solution. Still I feel its probaly not very elegant. Maybe I'm overcomplicating it because I came from C/C++ where you oftenly have to do stuff by hand.

I read that it's often not a good idea in python to write loops like in other languages with explicit indices (what I basically did here). Are there any alternatives?
Here is my proposal. It is shorter than OP's solution, specially to compute the length of each word to be used in the format procedure while printing.

In a single line, we obtain a 1D array with maximal lengths.

import numpy as np

tableData = [['apples', 'oranges', 'cherries', 'banana'],
             ['Alice', 'Bob', 'Carol', 'David'],
             ['dogs', 'cats', 'moose', 'goose']]

max_len = np.array([np.array(max([len(xii) for xii in xi])) for xi in tableData])

for col in range(len(tableData[0])):
    for i in range(len(tableData)):
        print ("{:&gt;%d}" % max_len[i]).format(tableData[i][col]),
    print ""


Output

  apples Alice  dogs 
 oranges   Bob  cats 
cherries Carol moose 
  banana David goose