Kaggle Challenge 03 - Functions and Getting Help
0. help()
I saw the abs function in the previous tutorial, but what if you've forgotten what it does?
Example : help(round)
Help on built-in function round in module builtins:
round(number, ndigits=None)
Round a number to a given precision in decimal digits.
The return value is an integer if ndigits is omitted or None. Otherwise
the return value has the same type as the number. ndigits may be negative.1. Question01(round)
Problem
def round_to_two_places(num):
"""Return the given number rounded to two decimal places.
>>> round_to_two_places(3.14159)
3.14
"""
# Replace this body with your own code.
# ("pass" is a keyword that does literally nothing. We used it as a placeholder
# because after we begin a code block, Python requires at least one line of code)
pass
round(3.14)
# Check your answer
q1.check()help(round)
Help on built-in function round in module builtins:
round(number, ndigits=None)
Round a number to a given precision in decimal digits.
The return value is an integer if ndigits is omitted or None. Otherwise
the return value has the same type as the number. ndigits may be negative.Solution
return round(num, 2)2. Question02
Problem
The help for round says that ndigits (the second argument) may be negative. What do you think will happen when it is? Try some examples in the following cell.Solution
Solution: As you've seen, ndigits=-1 rounds to the nearest 10, ndigits=-2 rounds to the nearest 100 and so on. Where might this be useful? Suppose we're dealing with large numbers:
The area of Finland is 338,424 km²
The area of Greenland is 2,166,086 km²
We probably don't care whether it's really 338,424, or 338,425, or 338,177. All those digits of accuracy are just distracting. We can chop them off by calling round() with ndigits=-3:
The area of Finland is 338,000 km²
The area of Greenland is 2,166,000 km²
(We'll talk about how we would get the commas later when we talk about string formatting :))3. Question03
Problem
In the previous exercise, the candy-sharing friends Alice, Bob and Carol tried to split candies evenly. For the sake of their friendship, any candies left over would be smashed. For example, if they collectively bring home 91 candies, they'll take 30 each and smash 1.
Below is a simple function that will calculate the number of candies to smash for any number of total candies.
Modify it so that it optionally takes a second argument representing the number of friends the candies are being split between. If no second argument is provided, it should assume 3 friends, as before.
Update the docstring to reflect this new behaviour.
def to_smash(total_candies):
"""Return the number of leftover candies that must be smashed after distributing
the given number of candies evenly between 3 friends.
>>> to_smash(91)
1
"""
return total_candies % 3
# Check your answer
q3.check()Solution
def to_smash(total_candies, n_friends=3):
return total_candies % n_friends
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