42.1.1. Introduction to Dictionaries
(c) A dictionary is a collection of unordered elements and each element will in the form a key: value pair.
(e) The dict() function is used to construct a dictionary.
42.1.2. Overview of Operations
(c) A value in a dictionary can be updated using the indexing operator along with the key.
(d) A for loop can be used to iterate through the elements of a dictionary.
42.2.1. Understand conversion of lists into a dictionary
(a) In Python 3 zip() function returns an iterator of tuples true or false?
(b) If there are no arguments, zip() function returns an empty outcome.
(d) sorted(dict.items()) function prints the arguments in sorted order.
42.2.2. Understand conversion of lists into dictionary
data1 = input("data1: ")
data2 = input("data2: ")
list1 = data1.split(",")
list2 = data2.split(",")
#print list1 and list2
print("list1:", list1 )
print("list2:", list2 )
#convert the two lists into a dictionary
mydict = dict(zip(list1,list2))
#print the sorted dictionary
print("dictionary:", sorted(mydict.items()))
42.2.3. Write a program to create a Dictionary using two Lists
#write your code here
d1 = input("data1: ").split(",")
d2 = input("data2: ").split(",")
if len(d1) == len(d2):
t = dict(zip(d1,d2))
print(sorted(t.items()))
else:
print("length should be equal")
42.2.4. Accessing elements in Dictionary
data1 = input("data1: ")
data2 = input("data2: ")
list1 = data1.split(",")
list2 = data2.split(",")
#convert the two lists into a dictionary
mydict = dict(zip(list1,list2))
#take input for key to print the value
key = input("key: ")
#write your logic to print the corresponding value
if key in mydict:
print("value:",mydict[key])
else:
print("value: None")
42.2.5. Membership Test in a Dictionary
#write your code here
d1 = input("data1: ").split(",")
d2 = input("data2: ").split(",")
d = dict(zip(d1,d2))
k = input("key: ")
if k in d:
print(True)
else:
print(False)
42.2.6. Iteration in dictionary
data1 = input("data1: ")
data2 = input("data2: ")
list1 = data1.split(",")
list2 = data2.split(",")
#create a dictionary with the list1 and list2
dict1 = dict(zip(list1,list2))
#complete the code to iterate over all the elements and print
for key, value in sorted(dict1.items()):
print(key,value)
42.2.7. Write a program to print elements of a dictionary using 'for clause'
#write your code here
d1 = input("data1: ").split(",")
d2 = input("data2: ").split(",")
d = dict(zip(d1,d2))
for key,value in sorted(d.items()):
print(f"{key} -> {value}")
42.2.8. Delete or Remove Elements from a Dictionary
data1 = input("data1: ")
data2 = input("data2: ")
list1 = data1.split(",")
list2 = data2.split(",")
#create a dictionary using the lists
dict1 = dict(zip(list1,list2))
#take key input to pop it
key = input("key: ")
if key in dict1:
print("value:", dict1.pop(key)) #correct the syntax of pop
sorted_dict = sorted(dict1.items())
print("dictionary:", sorted_dict)
else:
print("key does not exist")
42.2.9. Write a program to find value of a dictionary which are maximum and minimum using list methods min() and max()
data1 = input("data1: ")
data2 = input("data2: ")
list1 = data1.split(",")
list2 = data2.split(",")
dict1 = dict(zip(list1, list2))
#write your code here
print("max:",max(dict1.values()))
print("min:", min(dict1.values()))
42.2.10. Changing Existing Value of Key with user given Value in Dictionary
#write your code here
d1 = input("data1: ").split(",")
d2 = input("data2: ").split(",")
l = dict(sorted(zip(d1,d2)))
k = input("key: ")
if k in l:
v = input("value: ")
l[k] = v
l = list(l.items())
print("sorted dictionary:", l)
else:
print("key does not exist")
