Question

write a program in python to access a key and value pairs to print it​

Answer 1

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Answer 2

Answer:

Method #1 : Using in operator

Most used method that can possibly get all the keys along with its value, in operator is widely used for this very purpose and highly recommended as offers a concise method to achieve this task.

# Python3 code to demonstrate

# to get key and value

# using in operator

# initializing dictionary

test_dict = {"Geeks" : 1, "for" : 2, "geeks" : 3}

# Printing dictionary

print ("Original dictionary is : " + str(test_dict))

# using in operator to

# get key and value

print ("Dict key-value are : ")

for i in test_dict :

print(i, test_dict[i])

Output:

Original dictionary is : {'geeks': 3, 'for': 2, 'Geeks': 1}

Dict key-value are :

geeks 3

for 2

Geeks 1

Method #2 : Using list comprehension

This method also uses the method similar to above method, just binds the logic into one list and returns the key value pairs of dictionary as tuples of key and value in the list.

# Python3 code to demonstrate

# to get key and value

# using list comprehension

# initializing dictionary

test_dict = {"Geeks" : 1, "for" : 2, "geeks" : 3}

# Printing dictionary

print ("Original dictionary is : " + str(test_dict))

# using list comprehension to

# get key and value

print ("Dict key-value are : ")

print([(k, test_dict[k]) for k in test_dict])

Output:

Original dictionary is : {'Geeks': 1, 'for': 2, 'geeks': 3}

Dict key-value are :

[('Geeks', 1), ('for', 2), ('geeks', 3)]

Method #3 : Using dict.items()

items(), in dictionary iterates over all the keys and helps us to access the key-value pair one after the another in the loop and is also a good method to access dictionary keys with value.

# Python3 code to demonstrate

# to get key and value

# using dict.items()

# initializing dictionary

test_dict = {"Geeks" : 1, "for" : 2, "geeks" : 3}

# Printing dictionary

print ("Original dictionary is : " + str(test_dict))

# using dict.items() to

# get key and value

print ("Dict key-value are : ")

for key, value in test_dict.items():

print (key, value)

Output:

Original dictionary is : {'geeks': 3, 'for': 2, 'Geeks': 1}

Dict key-value are :

geeks 3

for 2

Geeks 1

Method #4 : Using enumerate()

Python also offers enumerate() with helps to iterate over all kinds of containers, be it dictionary or a list. The power of this function can also be utilized to perform this task. It also additionally helps to access the named index of position of the pair in dictionary.

# Python3 code to demonstrate

# to get key and value

# using enumerate()

# Printing dictionary

print ("Original dictionary is : " + str(test_dict))

# using enumerate() to

# get key and value

print ("Dict key-value are : ")

for i in enumerate(test_dict.items()):

print (i)

Output:

Original dictionary is : {'geeks': 3, 'Geeks': 1, 'for': 2}

Dict key-value are :

(0, ('geeks', 3))

(1, ('Geeks', 1))

(2, ('for', 2))