my pyhon code if [P2, P3, P4, P5] is [not None, None, None, None] it should work but isnt

Question

why it doesn't work? it should work here

def say_hi(P1, P2 = None, P3 = None, P4 = None, P5 = None):
    if [P2, P3, P4, P5] is [not None, None, None, None]:
        print(f'hi {P1}')
        print(f'hi {P2}')

say_hi('Jack', 'Rose')

why my code doesn't work? it execute nothing

Answer 1

Is meaning that these two object's is the same object. Not the equal. You need "==". https://dbader.org/blog/difference-between-is-and-equals-in-python

Try this.

def say_hi(*P):                                                             
     for p in P:
         print(f'hi {p}')

say_hi('Jack', 'Rose')

You can call function with number of parameters you need. All this parameters will be element of array "P".

You can read this about python function and parameters.