This If statement wont cooperate with my variable [duplicate]

This question already has an answer here:

• How to test multiple variables against a value? 14 answers
• Why does `a == b or c or d` always evaluate to True? [duplicate] 1 answer

Somehow, it always print out 'Yes'. Even if the input is 'Hello'. It will never go to the elif.

def commandFunction():
global command
while True:
    command = input(">>> ")
    commands(command)

def Action(c):
global command
if command == 'help' or 'Help' or 'HELP':
    print("Yes!")
elif command == 'hello':
    print("No!")