Question

我正在阅读Eric Matthes撰写的“Python Crash Course”一书，我似乎在练习8-15时遇到了问题。

8-15说：“将示例print_models.py的函数放在一个名为printing_functions.py的单独文件中。在print_models.py的顶部写一个import语句，并修改该文件以使用导入的函数。< / p>

这是我的printing_functions.py模块的代码：

def print_models(unprinted_designs, completed_models):
    """Simulate printing each design, until none are left.
    Move each design to completed_models after printing."""
    while unprinted_designs:
        current_design = unprinted_designs.pop()

        # Simulate creating a 3D print from the design.
        print("Printing model: " + current_design)
        completed_models.append(current_design)

def show_completed_models(completed_models):
    """Show all the models that were printed."""
    print("\nThe following models have been printed:")
    for completed_model in completed_models:
        print(completed_model)

unprinted_designs = ['iphone case', 'robot pendant', 'dodecahedron']
completed_models = []
print_models(unprinted_designs, completed_models)
show_completed_models(completed_models)

这是我的练习代码8-15

import printing_functions as pf

pf.print_models(unprinted_designs, completed_models)
pf.show_completed_models(completed_models)

unprinted_designs = ['iphone case', 'robot pendant', 'dodecahedron']
completed_models = []
print_models(unprinted_designs, completed_models)
show_completed_models(completed_models)

当我运行此代码时，我能够收到与模块中相同的输出。但是我也收到并在底部显示错误，指出未定义'unprinted_designs'。但我明确将此变量定义在我的代码底部附近作为列表，所以我不明白为什么我收到此错误。

有没有人对我可能做错了什么有任何想法？任何反馈将不胜感激。谢谢你的时间。

Answer 1

您大部分都做了正确的事情，但需要先分配变量才能使用它们。

此外，由于您已将功能分离/移动到模块，因此必须使用那些导入的功能，而变量仍保留在此模块中

import printing_functions as pf

unprinted_designs = ['iphone case', 'robot pendant', 'dodecahedron']
completed_models = []

pf.print_models(unprinted_designs, completed_models)
pf.show_completed_models(completed_models)

然后，删除另一个模块末尾的不必要的行。只有函数定义应该在那里

Python Crash Course 8-15，未定义错误

1 个答案: