Question

The following works in python2 for calling the list of function objects stored in the functions list:

for f in functions:
    map(f, data)

What is the equivalent for python3 as the above doesn’t seem to work

Answer 1

map in Python 3 returns an iterator, that’s why nothing happens when you just call it.

Since you apparently don’t care about returned values, I think it’s best to use an explicit loop:

for f in functions:
    for d in data:
       f(d)

If you actually do store the results in Python2:

for f in functions:
    a = map(f, data)

then you could to change it to

for f in functions:
    a = list(map(f, data))

But I’d advise against using a list if you don’t actually need the return values. It takes extra time and memory to build them and discard them right away.