from functools import wraps

installed_packages = []


def install_package(pkg):
    if pkg not in installed_packages:
        installed_packages.append(pkg)
        print(f"Installed: {pkg}")
    else:
        print(f"Already installed: {pkg}")


def needs_packages(packages):
    def inner_decorator(function):
        @wraps(function)
        def execution_wrapper(*args, **kwargs):
            [install_package(package) for package in packages]
            return function(*args, **kwargs)

        return execution_wrapper

    return inner_decorator


@needs_packages(['vim', 'calc'])
def add(z1, z2):
    return z1 + z2


@needs_packages(['calc', 'sed'])
def sub(z1, z2):
    return z1 - z2


@needs_packages(['calc'])
def bla(z1, z2):
    return z1 / z2


print(add(1, 2))
print(sub(1, 2))
print(bla(1, 2))