from enum import Enum

GLOBAL_VAR = "Hello, World!"


def global_function():
    print('This is a global function.')


class GlobalClass:
    def __init__(self):
        self.value = 'This is a global class instance.'

    def display(self):
        print(self.value)


class ModeSelect(Enum):
    MODE_A = 'mode_a'
    MODE_B = 'mode_b'
    MODE_C = 'mode_c'


GLOBAL_MODE = ModeSelect.MODE_C