DAT4/code/02_python_quiz_solution.py at master · justmarkham/DAT4 · GitHub

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'''

Python quiz: SOLUTION

'''

## SECTION 1:

# 1. How do you create an empty list named mylist?

# Answer: mylist = []

# Alternative: mylist = list()

# 2. Without running the code, what will this return?

5 == 5.0

# Answer: True

# 3. Without running the code, what will this return?

5 > 3 or 5 < 3

# Answer: True

# 4. How do I return the number 50 from this list?

numlist = range(1, 101)

# Answer: numlist[49]

# 5. Without running the code, what will these return?

len(numlist)

# Answer: 100

type(numlist)

# Answer: list

## SECTION 2:

# 6. Divide 3 by 2 and get a result of 1.5

# Answer: 3/float(2)

# Alternative: 3/2.0

# Alternative: from __future__ import division

# 7. Import the math module, and use the sqrt() function to take the square root of 1089.

# Answer: import math

# math.sqrt(1089)

# Alternative: from math import sqrt

# sqrt(1089)

# 8. Slice newlist to return a list with the numbers 2, 3, 4:

newlist = [0, 1, 2, 3, 4, 5, 6]

# Answer: newlist[2:5]

# 9. From this dictionary, return the 10, and then change the 30 to a 40.

d = {'a':10, 'b':20, 'c':30}

# Answer part 1: d['a']

# Answer part 2: d['c'] = 40

# 10. Convert this for loop into a "better" for loop that doesn't use the i variable:

fruits = ['apple', 'banana', 'cherry']

for i in range(len(fruits)):

print fruits[i].upper()

# Answer: for fruit in fruits:

# print fruit.upper()

## SECTION 3:

# 11. Define a function "calc" that takes two variables, a and b, and returns their sum.

# Answer: def calc(a, b):

# return a + b

# 12. Join these two lists to make a single list [1, 2, 3, 4]:

list1 = [1, 2]

list2 = [3, 4]

# Answer: list1.append(list2)

# Alternative: list1 + list2

# Note: The first answer modifies list1, whereas the second doesn't modify either list

# 13. Return Brandon's state only:

locations = {'Sinan': ['Baltimore', 'MD'], 'Brandon': ['Arlington', 'VA']}

# Answer: locations['Brandon'][1]

# 14. Without running the code, what will the second line return?

nums = [1, 2, 3]

[num*2 for num in nums]

# Answer: [2, 4, 6]

# 15. Turn this for loop into a list comprehension:

upperfruits = []

for fruit in fruits:

upperfruits.append(fruit.upper())

# Answer: upperfruits = [fruit.upper() for fruit in fruits]

DAT4/code/02_python_quiz_solution.py at master · justmarkham/DAT4 · GitHub

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