For questions asking you to figure out what is printed when certain code is evaluated, please write down your solution to the problem before trying to run the provided code on your computer.
- Complete the function below with a single line of code.
def squared_list(list_of_integers):
"""Returns a list corresponding to the input list of integers, with all elements squared.
>>> squared_list([1, 2, 3])
[1, 4, 9]
"""
return _________________________- Complete the function below.
def square_elements(list_of_integers):
"""Mutates the input list of integers, squaring all elements.
>>> ints = [1, 2, 3]
>>> square_elements(ints)
>>> ints
[1, 4, 9]
"""
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__________________________- Complete the function below.
def reverse(a_list):
"""Mutates the input list, reversing the elements.
>>> ints = [1, 2, 3]
>>> reverse(ints)
>>> ints
[3, 2, 1]
"""
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__________________________- There is a built-in function
zip, which takes two lists and 'zips' them together. An example is
>>> for tuple in zip([1, 2], ['a', 'b']):
... print tuple
(1, 'a')
(2, 'b')The documentation for zip is
zip(...)
zip(seq1 [, seq2 [...]]) -> [(seq1[0], seq2[0] ...), (...)]
Return a list of tuples, where each tuple contains the i-th element
from each of the argument sequences. The returned list is truncated
in length to the length of the shortest argument sequence.
Write function my_zip that mimics the behavior of zip.
def my_zip(a, b):
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__________________________- Fill in the blanks in the following function definition for adding a to the absolute value of b, without calling
abs.
from operator import add, sub
def a_plus_positive_b(a, b):
"""Returns the sum of a and the positive value of b, without calling the abs() built-in.
>>> a_plus_abs_b(3, 4)
7
>>> a_plus_abs_b(3, -4)
7
"""
if b < 0:
f = _____
else:
f = _____
return f(a, b)- Write what is printed when the following code is evaluated.
def boom():
return 1 / 0
boom
boom()- Write what is printed when the following code is evaluated.
def hmm(a=[]):
a.append(1)
return a
print(hmm())
print(hmm())
print(hmm())- Write what is printed when the following code is evaluated.
def magic_print(a, b):
print(print(a), print(b))
magic_print(1, 2)- Write what is printed when the following code is evaluated.
from operator import add, mul
def f(x, y):
print('batman ', y)
return add(add(x, y), 1)
def g(x, y):
print('robin ', x)
return mul(mul(x, y), 2)
f(2, g(2, f(500, 2)))- These steps give the hailstore sequence, as written in Douglas Hofstadter's book Gödel, Escher, Bach.
Pick a positive integer n as the start.
If n is even, divide it by 2.
If n is odd, multiply it by 3 and add 1.
Continue this process until n is 1.
Write function hailstone(n) to print the hailstone sequence starting at n, and return its length.
def hailstone(n):
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__________________________- Write what is printed when the following code is evaluated.
class Song(object):
def __init__(self, lyrics):
self.lyrics = lyrics
def print_song(self):
for line in self.lyrics:
print line
roses_song = Song([
"Roses are red"
, "Violets are blue"
, "Carnations can also be red..."
, "Woohoo!"
])
roses_song.print_song()- Write what is printed when the following code is evaluated.
o = min
o = max
g, h = (min, max)
max = g
goo = max(o(3, g(2, h(1, 5), 3)), 4)
print(goo)You've completed this lab!