#------------------------------------------------------------------------------
#  FormatNumbers1.py
#  Illustrates using the str.format() function to control how numbers and
#  strings are printed.  Read about the string format() function in section 
#  8.16 of the online text.
#------------------------------------------------------------------------------

import random

# Create a random number generator
rng = random.Random(242)  # Using a seed produces the same 'random' numbers
                          # every time you run the program 

# Create two lists A and B of random numbers to format
A = []
for i in range(20):
   A.append(rng.uniform(0,999))
# end for

# here's a shorter, equivalent method for building a list
B = [rng.uniform(0,999) for i in range(20)]

# print them in three columns using format() function, third column are same
# numbers as the first, but formatted differently.
print("{0:<19}{1:<24}{0}".format("List A", "List B"))
format_string = "{0:<19.10f}{1:<23.15f}{0:>10.5f}"
for i in range(20):
   print(format_string.format(A[i],B[i]))
# end for