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who did what

SOLUTION

You were to use your pencil to draw a line matching each BIF to the correct
description. Once you had all your lines drawn, you were to circle the BIF
you think you need to use in the next version of your function.

BIF What the BIF does

list() Creates a numbered list of paired-data, starting
from 0.

range() Returns the unique identification for a Python
data object.
This BIF
looks
interesting. enumerate() A factory function that creates a new, empty list.

int() Returns the next item from a iterable data
structure such as a list.

id() Returns an iterator that generates numbers in a
specified range on demand and as needed.

next() Converts a string or another number to an
integer (if possible).

The range() BIF iterates a fixed number of times

The range() BIF gives you the control you need to iterate a specific
number of times and can be used to generate a list of numbers from zero up-
to-but-not-including some number. Here’s how to use it: Generate numbers up-to-
but-not-including 4.
“num” is the target identifier
and is assigned each of the for num in range(4):
numbers generated by “range()” print(num)
in turn. The numbers 0, 1, 2, and 3 will
appear on screen.

54 Chapter 2