"Python Cookbook" "Data Structure and algorithm" 10. Remove duplicates from the sequence and keep the order between elements unchanged

Problem: Remove duplicate elements from the sequence, but still leave the remaining elements in the same order

Solution:

1. If a value in a sequence can be hashed (hashable), it can be resolved by using the collection and the generator.

2, if the sequence is not hashed, want to remove duplicates, you need to modify the above code slightly:

The function of the key parameter is to specify a function to convert the elements in the sequence into a hash type, so that duplicates can be detected.

"Python Cookbook" "Data Structure and algorithm" 10. Remove duplicates from the sequence and keep the order between elements unchanged