On 21/11/2015 13:20, Cai Gengyang wrote:
This is a piece of code that calculates tax and tip :
def tax(bill):
"""Adds 8% tax to a restaurant bill."""
bill *= 1.08
print "With tax: %f" % bill
return bill
def tip(bill):
"""Adds 15% tip to a restaurant bill."""
bill *= 1.15
print "With tip: %f" % bill
return bill
meal_cost = 100
meal_with_tax = tax(meal_cost)
meal_with_tip = tip(meal_with_tax)
Does bill *= 1.08 mean bill = bill * 1.15 ?
bill *= 1.08 would mean bill = bill*1.08 (not 1.15; I assume that's a typo).
Although you can never be 100% sure in Python (as * or *= could have
been redefined to do something else), there's no reason to suspect that
here.
Also, there's probably some technical difference that someone could up
with (*= doing in-place modification for example), but that shouldn't
matter when bill is just a number.
--
Bartc
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