Building a list from the commands arguments ensures that it is iterable and keeps a local copy of the command references in each MacroCommand instance.

MacroCommand.py

class MacroCommand:
 """A command that executes a list of commands"""
 def __init__(self, commands):
 self.commands = list(commands) # 
 def __call__(self):
 for command in self.commands: # 
 command()