When it is required to sort the tuple based on the occurrence of the first element, the dict.fromkeys method can be used.
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.fromkeys' method will return a dictionary with a specific key and a value.
Below is a demonstration for the same −
Example
def sort_on_occurence(my_lst):
my_dict = {}
for i, j in my_lst:
my_dict.setdefault(i, []).append(j)
return([(i, *dict.fromkeys(j), len(j))
for i, j in my_dict.items()])
my_list = [(1, 'Harold'), (12, 'Jane'), (4, 'Paul'), (7, 'Will')]
print("The list of tuples is")
print(my_list)
print("The list after sorting by occurence is")
print(sort_on_occurence(my_list))Output
The list of tuples is [(1, 'Harold'), (12, 'Jane'), (4, 'Paul'), (7, 'Will')] The list after sorting by occurence is [(1, 'Harold', 1), (12, 'Jane', 1), (4, 'Paul', 1), (7, 'Will', 1)]
Explanation
- A method named 'sort_on_occurence' is defined, that takes a list of tuple as parameter.
- A new dictionary is created.
- The list of tuple is iterated over, and default values are set inside the empty dictionary.
- A list of tuple is defined, and is displayed on the console.
- The function is called by passing the above defined list of tuple.
- This is the output that is displayed on the console.