Question

I have the following Python code:

data  = ['1', '4.6', 'txt']
funcs = [int, float, str]

How to call every function with data in corresponding index as an argument to the function?
Now I’m using the code:

result = []
for i, func in enumerate(funcs):
    result.append(func(data[i]))

map(funcs, data) don’t work with lists of functions ( Is there builtin function to do that simpler?

Answer 1

You could use zip* to combine many sequences together:

zip([a,b,c,...], [x,y,z,...]) == [(a,x), (b,y), (c,z), ...]

then you could iterate on this new sequence and make each function apply on the corresponding data. Since you just want to collect them into a list, list comprehension is much better than a for-loop:

result = [f(x) for f, x in zip(funcs, data)]

_{Note: * Use itertools.izip if you are using Python 2.x and the lists are very long.)}