08_pipeline.py

"""
10 min

As part of a data processing pipeline, complete the implementation of
the pipeline method:

* The method should accept a variable number of functions, and it should return
  a new function that accepts one parameter arg.
* The returned function should call the first function in the pipeline with
  the parameter arg, and call the second function with the result of the first function.
* The returned function should continue calling each function in the pipeline
  in order, following the same pattern, and return the value from the last function.

For example, pipeline(lambda x: x * 3, lambda x: x + 1, lambda x: x / 2) then
calling the returned function with 3 should return 5.0.


    def pipeline(*funcs):
        def helper(arg):
            pass
        return helper

    fun = pipeline(lambda x: x * 3, lambda x: x + 1, lambda x: x / 2)
    print(fun(3)) #should print 5.0
"""


def pipeline(*funcs):
    def helper(arg):
        for f in funcs:
            arg = f(arg)
        return arg

    return helper


fun = pipeline(lambda x: x * 3, lambda x: x + 1, lambda x: x / 2)
print(fun(3))  # should print 5.0