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Selective value selection in list of tuples in Python
When it is required to find the selective value in a list of tuples, the 'dict' method, the 'get' method and the list comprehension can be used.
The list comprehension is a shorthand to iterate through the list and perform operations on it. A list can be used to store heterogeneous values (i.e data of any data type like integer, floating point, strings, and so on).
A list of tuple basically contains tuples enclosed in a list.
The 'dict' method creates a dictionary. It contains key value pairs, which are unordered, and indexed.
The 'get' method returns the value of a specific key when the key is present in a dictionary.
Below is a demonstration for the same −
my_list_1 = [('Jane', 11), ('Nick', 12), ('Will', 33), ('Paul', 14)] my_list_2 = ['Nick', 'Paul'] print ("The list of tuple is : ") print(my_list_1) print ("The second list is : ") print(my_list_2) temp_val = dict(my_list_1) my_result = [temp_val.get(i, 0) for i in my_list_2] print ("The selective values of the keys are : ") print(my_result)
The list of tuple is : [('Jane', 11), ('Nick', 12), ('Will', 33), ('Paul', 14)] The second list is : ['Nick', 'Paul'] The selective values of the keys are : [12, 14]
- A list of tuple is defined, and is displayed on the console.
- Another list is defined.
- A dictionary is created from the list of tuple.
- This is used to iterate over the other list.
- This value is assigned to another variable.
- This variable is displayed as output on the console.
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