Dictonary_Assignment

Question

1. Give three examples of real-world objects that behave like a dictionary.

2. Assume that the variable data refers to the dictionary {“b”:20, “a”:35}.

  Write the values of the following expressions(ie results)

  a. data[“a”]

  b. data.get(“c”, None)

  c. len(data)

  d. data.keys()

  e. data.values()

  f. data.pop(“b”)

  g. data # After the pop above

3. Assume that the variable data refers to the dictionary {“b”:20, “a”:35}.

  Write the expressions that perform the following tasks (ie python code):

  a. Replace the value at the key “b” in data with that value’s negation.

  b. Add the key/value pair “c”:40 to data.

  c. Remove the value at key “b” in data, safely.

  d. Print the keys in data in alphabetical order.

Answer 1

1)

Telephone book: relates name and phone #

barcode # : price

account # : balance

license plate # : vin #

student # : name

social security # : tax amount

2)

a) 35

b) None

c) 2

d) ['b','a']

e) [20,35]

f) 20

g) {"a":35)

3)

a) x = data.get("b")

data["b"]=-x

print(data)

(b) data.update({"c":40})

print(data)

(c) data.pop("b")

print(data)

(d) dict_keys = data.keys()

keyList = []

for key in dict_keys:

#print(key)

keyList.append(key)

keyList.sort()

print(keyList)