command_example.py

# ----------------
# Command Pattern.
# ----------------
# Encapsulate a request as an object, thereby allowing for the parameterization of clients with different requests, 
# and the queuing or logging of requests. It also allows for the support of undoable operations.

classInstaller:
def__init__(self, source, dir):
self.options= []
self.dir=dir
self.source=source

defadd_preferences(self, cmd):
self.options.append(cmd)

definstall(self):
foroptioninself.options:
value= [vfork, vinoption.items()]

if (value[0]):
print("installing files -- ", [kfork, vinoption.items()], self.source, " to ", self.dir)
else:
print('Not installed: ', [kfork, vinoption.items()])

installer=Installer('C++ binaries', 'c:\\c++\\binaries')
installer.add_preferences({'c++':True})
installer.add_preferences({'c#': False})
installer.install()