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我很困惑。我正在尝试学习使用 pytest-bdd 和 gherkin，但我收到一个 TypeError 说 NoneType 不可迭代。我认为这意味着我试图从中获取值的 dict 不知何故成为了这里某处的 NoneType 对象，但我不知道何时、如何或为什么。发生了什么？如何修复此代码？（请假设此代码引用的程序按预期工作，因为它确实如此。）

这是我遇到很多次的错误（每个测试用例一次）：

________________________ test_verify_correct_returns_for_retirement_time[2021-11-January-2099] ________________________

request = <FixtureRequest for <Function test_verify_correct_returns_for_retirement_time[2021-11-January-2099]>>
_pytest_bdd_example = {'month': '11', 'month_name': 'January', 'retire_year': '2099', 'year': '2021'}

    @pytest.mark.usefixtures(*args)
    def scenario_wrapper(request, _pytest_bdd_example):
        scenario = templated_scenario.render(_pytest_bdd_example)
>       _execute_scenario(feature, scenario, request)

..\..\..\..\appdata\local\programs\python\python39\lib\site-packages\pytest_bdd\scenario.py:174:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
..\..\..\..\appdata\local\programs\python\python39\lib\site-packages\pytest_bdd\scenario.py:144: in _execute_scenario
    _execute_step_function(request, scenario, step, step_func)
..\..\..\..\appdata\local\programs\python\python39\lib\site-packages\pytest_bdd\scenario.py:114: in _execute_step_function
    return_value = step_func(**kwargs)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

user_inputs = {'user_birthmonth': '11', 'user_birthyear': '2021'}, retire_year = '2099', month_name = 'January'

    @then(parsers.parse("the text the program returns should include 'This will be in {month_name} of {retire_year}.'"), converters=CONVERTERS)
    def check_return(user_inputs, retire_year, month_name):
>       assert f'This will be in {month_name} of {retire_year}.' in main(user_inputs["user_birthyear"], user_inputs["user_birthmonth"])
E       TypeError: argument of type 'NoneType' is not iterable

test_basic_functionality_steps.py:36: TypeError

from pytest_bdd import scenarios, parsers, given, when, then
import pytest
from .full_retirement_age import main

CONVERTERS = {
    'year': str,
    'month': str,
    'retire_years': str,
    'retire_months': str,
    'retire_year': str,
    'month_name': str
}

scenarios("basic_functionality.feature")

@pytest.fixture
@given("the user is using the full_retirement_age.py program")
def user_inputs():
    return dict(user_birthyear="", user_birthmonth="")

@when(parsers.parse('the user enters {year} when prompted for their year of birth'), converters=CONVERTERS)
def input_year(user_inputs, year):
    user_inputs["user_birthyear"] = year

@when(parsers.parse('the user enters {month} when prompted for their month of birth'), converters=CONVERTERS)
def input_month(user_inputs, month):
    user_inputs["user_birthmonth"] = month


@then(parsers.parse("the text the program returns should include 'Your full retirement age is {retire_years} and {retire_months} months.'"), converters=CONVERTERS)
def check_return(user_inputs, retire_years, retire_months):
    assert f'Your full retirement age is {retire_years} and {retire_months} months.' in main(user_inputs["user_birthyear"], user_inputs["user_birthmonth"])

@then(parsers.parse("the text the program returns should include 'This will be in {month_name} of {retire_year}.'"), converters=CONVERTERS)
def check_return(user_inputs, retire_year, month_name):
    assert f'This will be in {month_name} of {retire_year}.' in main(user_inputs["user_birthyear"], user_inputs["user_birthmonth"])

Feature: Shows Retirement Age and Time
  A user will be able to enter their birth year and month,
  and get back a string of text printed to the console
  that tells them their retirement age as well as the
  year and month that they will retire


  Scenario Outline: Verify Correct Returns for Retirement Age
    Given the user is using the full_retirement_age.py program
    When the user enters <year> when prompted for their year of birth
    And the user enters <month> when prompted for their month of birth
    Then the text the program returns should include 'Your full retirement age is <retire_years> and <retire_months> months.'
    
    # month should not effect the output of retirement age (but should for retirement time)
    Examples:
      | year | month | retire_years | retire_months |
      | 1943 | 7     | 66           | 0             |
      | 1954 | 12    | 66           | 0             |
      | 1942 | 6     | 65           | 10            |
      | 1920 | 4     | 62           | 2             |
      | 1900 | 8     | 58           | 10            |
      | 1955 | 9     | 66           | 2             |
      | 1980 | 1     | 70           | 4             |
      | 2021 | 11    | 77           | 2             |
    
  Scenario Outline: Verify Correct Returns for Retirement Time
    Given the user is using the full_retirement_age.py program
    When the user enters <year> when prompted for their year of birth
    And the user enters <month> when prompted for their month of birth
    Then the text the program returns should include 'This will be in <month_name> of <retire_year>.'
    
    # In order for these examples to return the correct date, the last scenario
    # must work in its entirety as this scenario depends on the function the
    # last scenario was testing
    Examples:
      | year | month | month_name | retire_year |
      | 1943 | 7     | July       | 2009        |
      | 1954 | 12    | December   | 2020        |
      | 1942 | 6     | April      | 2008        |
      | 1920 | 4     | June       | 1982        |
      | 1900 | 8     | June       | 1959        |
      | 1955 | 9     | November   | 2021        |
      | 1980 | 1     | May        | 2050        |
      | 2021 | 11    | January    | 2099        |
4

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