How To Create A Set Of Parametrized Functions In Python?

I am trying to create a family of functions, parametrized by a 'shift' parameter. Consider the code below. I want the for loop to create a set of functions, each of which shifts th

Solution 1:

The difference in output in both the loops in because of the difference in the value of idx.

In your first for loop, you stored the reference of function f() in fns list. Here, value of idx is not stored as part of your function f() inside fnx.

for idx inrange(N):
    deff(x): # shift input by idxreturn x+idx
    fns.append(f)

Once you executed this loop, idx is holding the value as 4 (N-1 from the for loop).

Hence, your second loop print the values using idx as 4. i.e. f() printed the value 4+1

for i in range(N):
  print(fns[i](1))

However in your 3rd loop, you are re-initializing the the value of idx as part of for loop and your fns is getting the value in range 0 to 4 with each iteration.

for idx in range(N):
  print(fns[idx](1))

That's why you see the value ranging from 1 to N here (because of idx ranging from 0 to N-1).