#!/usr/bin/env python

"""

String formatting lab:

This version using the format() method

"""

#####

# Write a format string that will take the tuple:

# (2, 123.4567, 10000, 12345.67)

# and produce:

# 'file_002 : 123.46, 1.00e+04, 1.23e+04'

#####

print("file_{:03d} : {:10.2f}, {:.2e}, {:.3g}".format(2, 123.4567, 10000, 12345.67))

print()

# Note the subtle differnce between the 'e' and 'g' formatting strings.

# I like 'g' -- it does significant figures.

#######################

# Rewrite: "the 3 numbers are: %i, %i, %i"%(1,2,3)

# for an arbitrary number of numbers...

# solution 1

# the goal was to demonstrate dynamic building of format strings:

def formatter(t):

# The static part of the string

fstring = "the {:d} numbers are: ".format(len(t))

# This add the correct number of format specifiers:

fstring += ", ".join(['{:d}'] * len(t))

# The created string can be now applied to the tuple of numbers

# * unpacks a sequence into the arguments of a function -- we'll get to that!

return fstring.format(*t)

# call it with a couple different tuples of numbers:

print(formatter((2, 3, 5)))

print(formatter((2, 3, 5, 7, 9)))

# solution 2

# You may have realized that str() would make a nice string from

# a list or tuple

# perfectly OK to use that -- though it doesn't demonstrate how you can

# dynamically build up format strings, and then use them later...

numbers = (34, 12, 3, 56)

numbers_str = str(numbers)[1:-1] # make a string, remove the brackets

# put it together with the rest of the string

print("the first {:d} numbers are: {}".format(len(numbers), numbers_str))