Assuming I have a function that converts a character in a collection of strings like -
from typing import Collection
def replace_in_collection(input_collection: Collection[str]) -> Collection[str]:
return [x.replace('a', 'b') for x in input_collection]
How do I create this function in a generic way, So that it returns the same collection type like the input type (not just a list like in the function example above).
So what I want is something that has the following behavior:
my_set = {'ab','ac'}
my_set_result = replace_in_collection(my_set)
type(my_set_result ) # --> set
my_list = ['ab','ac']
my_list_result = replace_in_collection(my_list)
type(my_list_result) # --> list
Is there a way to create this with a comprehension without using individual type checking?
Assuming that all the types of collections accept iterable as __init__ parameter, that should work:
def replace_in_collection(input_collection):
collection_type = type(input_collection)
return collection_type(x.replace('a', 'b') for x in input_collection)
It does work for set, list and tuple.
And as Chris Rands noted, you should probably check if your input is of supported type:
if not isinstance(input_collection, (set, list, tuple)): # add other types if needed
raise TypeError(f"input_collection must be of type set, list or tuple, not {type(input_collection).__name__}")