Execute functions in a list as a chain
composition, function, python
Solution
def execu(lst, seq, raw_para):
return reduce(lambda x, y: y(x), reversed(operator.itemgetter(*seq)(lst)), raw_para)
Problem
In Python I defined these functions: ``` def foo_1(p): return p + 1 def foo_2(p): return p + 1 def foo_3(p): return p + 1 def foo_4(p): return p + 1 def foo_5(p): return p + 1 ``` I want to execute these functions in a chain like this: ``` foo_1(foo_2(foo_3(foo_4(foo_5(1))))) ``` I'd like to specify these functions as a list, executing those functions in a chain with a precise sequence. This is what I've tried: ``` lf = [Null,foo_1,foo_2,foo_3,foo_4,foo_5] # Null is for +1 issue here def execu(lst, seq, raw_para): # in some way execu(lf,(1,2,3,4,5), 1) # = foo_1(foo_2(foo_3(foo_4(foo_5(1))))) execu(lf,(1,2,3), 1) # = foo_1(foo_2(foo_3(1))) execu(lf,(3,3,3), 1) # = foo_3(foo_3(foo_3(1))) ```