On Fri, Sep 30, 2016 at 5:07 AM, Steven D'Aprano <st...@pearwood.info> wrote:
[snip]
> and preferably three:
>
> (1) function that does the calculation;
> (2) function that does the output;
> (3) function that calls (1) and then (2)
>
>
> If (1) and (2) are well-designed, then (3) is so trivial it needs no
> tests:
>
> def main():
> x = calculate(stuff)
> report(x)
>
> but of course it's not always that simple. Nevertheless, that's the
> ideal you should aim for.
OK, I want to make sure I have this thoroughly comprehended. I have
rewritten my once simple program into the following:
===============================================================================
'''Exerise 3.1 from "Think Python 2" by Allen Downey.
This module will take a string and right justify it so that the last character
of the line will fall in column 70 of the display. The results will be
printed to stdout.'''
def right_justify(a_string):
'''This fucntion will take the string, "a_string", and right justify it by
padding it with spaces until its last character falls in column 70 of the
display. If "a_string" has more than 70 characters, then "a_string" will
be truncated to 70 characters. The padded or truncated string will be
returned along with a message if "a_string" is truncated.'''
if len(a_string) <= 70:
num_pad_spcs = 70 - len(a_string)
return ((' ' * num_pad_spcs) + a_string), # Note trailing comma.
else:
msg = ("The string has too many characters (> 70)!\n" +
"Only a partial, 70 character line will be returned.")
return msg, a_string[:70]
def print_msgs(*msgs):
'''Prints messages to stdout.'''
for msg in msgs:
print(msg)
def main(input_strings):
'''Run main program.'''
print('0123456789' * 7) # Print a number guide to check length of line.
for input_string in input_strings:
print_msgs(*right_justify(input_string))
if __name__ == '__main__':
input_strings = [
"Monty Python",
"She's a witch!",
"Beware of the rabbit!!! She is a vicious beast who will rip"
" your throat out!",
""]
main(input_strings)
=============================================================================
Does this meet the criteria of each function doing its specific thing?
Or is there something else I need to decouple/improve?
--
boB
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