#!/usr/bin/env python3

import random

def get_int(msg, minimum, default):

while True:

try:

line = input(msg)

if not line and default is not None:

return default

i = int(line)

if i < minimum:

print("must be >=", minimum)

else:

return i

except ValueError as err:

print(err)

rows = get_int("rows: ", 1, None)

columns = get_int("columns: ", 1, None)

minimum = get_int("minimum (or Enter for 0): ", -1000000, 0)

default = 1000

if default < minimum:

default = 2 * minimum

maximum = get_int("maximum (or Enter for " + str(default) + "): ",

minimum, default)

row = 0

while row < rows:

line = ""

column = 0

while column < columns:

i = random.randint(minimum, maximum)

s = str(i)

while len(s) < 10:

s = " " + s

line += s

column += 1

print(line)

row += 1