CODEWITHSUNDEEP
pythonalgorithmmapping
user7811364
user7811364

Reputation:

Mapping list of functions to list of items element-wise

I have 3 functions (f1, f2 and f3) that each take an input and return a str.

These functions are stored in a list in an order that is determined by settings in a program prior to receiving inputs. Their ordering may be different each time a program is run:

# User A's run:
funcs = [f1, f1, f2, f1, f3]

# User B's run:
funcs = [f3, f3, f2]

During program execution, a list of inputs will be generated that correspond the to ordering of funcs. That is to say, the item type of each index in the list inputs will be the correct type expected by the function at the corresponding index of funcs:

# f1 expects int
# f2 expects float
# f3 expects str

funcs = [f1, f1, f2, f1, f3]
inputs = [0, 1, 3.14, 10, 'abc']

I need to map funcs to inputs element-wise and concatenate the resulting string. Currently I solve this by using zip:

result = ''.join(f(i) for f, i in zip(func, inputs))

Is there another way to achieve this type of mapping or is zip the ideal way?

Upvotes: 2

Views: 103

Answers (1)

DDD1
DDD1

Reputation: 450

I think you can import FunctionType and map each function to each input directly (tried it with a list of lambdas and it does work):

from types import FunctionType
funcs = [f1,f1,f2,f1,f3]
inputs = [0, 1, 3.14, 10, 'abc']
"".join(map(FunctionType.__call__, funcs, inputs))

Upvotes: 1

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