先看例子：
def get_early_stopping(monitor=5, patience=6): return get_model_path(a=monitor, b=patience) def get_model_checkpoint(model_path = 'Python'): return print('Why ' + model_path + ' is so difficult for newbies to learn ?') def get_model_path(a=1,b=2): return a + b def get_callbacks(): stopping = get_early_stopping(monitor=7, patience=8) model_path = get_model_path(3, 4) checkpointer = get_model_checkpoint(model_path = 'Perl') return [stopping, model_path, checkpointer] [x, y, z] = get_callbacks() print(get_callbacks()) print(y) d = get_model_path(3,7) print(d)assert Why Perl is so difficult for newbies to learn ? Why Perl is so difficult for newbies to learn ? [15, 7, None] 7 10
