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Accessing Key-value in a Python Dictionary
While analyzing data using Python data structures we will eventually come across the need for accessing key and value in a dictionary. There are various ways to do it in this article we will see some of the ways.
With for loop
Using a for loop we can access both the key and value at each of the index position in dictionary as soon in the below program.
Example
dictA = {1:'Mon',2:'Tue',3:'Wed',4:'Thu',5:'Fri'} #Given dictionary print("Given Dictionary: ",dictA) # Print all keys and values print("Keys and Values: ") for i in dictA : print(i, dictA[i])
Output
Running the above code gives us the following result −
Given Dictionary: {1: 'Mon', 2: 'Tue', 3: 'Wed', 4: 'Thu', 5: 'Fri'} Keys and Values: 1 Mon 2 Tue 3 Wed 4 Thu 5 Fri
With list comprehension
In this approach we consider the key similar to an index in a list. So in the print statement we represent the keys and the values as a pair along with the for loop.
Example
dictA = {1:'Mon',2:'Tue',3:'Wed',4:'Thu',5:'Fri'} #Given dictionary print("Given Dictionary: ",dictA) # Print all keys and values print("Keys and Values: ") print([(k, dictA[k]) for k in dictA])
Output
Running the above code gives us the following result −
Given Dictionary: {1: 'Mon', 2: 'Tue', 3: 'Wed', 4: 'Thu', 5: 'Fri'} Keys and Values: [(1, 'Mon'), (2, 'Tue'), (3, 'Wed'), (4, 'Thu'), (5, 'Fri')]
With dict.items
The dictionary class has a method named items. We can access the items method and iterate over it getting each pair of key and value.
Example
dictA = {1:'Mon',2:'Tue',3:'Wed',4:'Thu',5:'Fri'} #Given dictionary print("Given Dictionary: ",dictA) # Print all keys and values print("Keys and Values: ") for key, value in dictA.items(): print (key, value)
Output
Running the above code gives us the following result −
Given Dictionary: {1: 'Mon', 2: 'Tue', 3: 'Wed', 4: 'Thu', 5: 'Fri'} Keys and Values: 1 Mon 2 Tue 3 Wed 4 Thu 5 Fri