Python 局部变量可能在赋值之前被引用

嗨，我有两本字典1。小学，2。次要的

需要检查两个字典的第一个字段

primary = {"Latest":[
  {
    "name": "Employee",
    "field": "employee",
    "values": [
      {
        "title": "A",
        "paragraph": "null",
        "count": "1"
      }
    ]
  },
  {
    "name": "Project",
    "field": "project",
    "values": [
      {
        "title": "NEW_York",
        "paragraph": "null",
        "count": "3"
      }
    ]
  },
  {
    "name": "Designation",
    "field": "designation",
    "values": [
      {
        "title": "Developer",
        "paragraph": "null",
        "count": "1"
      }
    ]
}
]}
secondary = [
  {
    "name": "Employee",
    "field": "employee",
    "values": [
      {
        "title": "A",
        "paragraph": "Test",
        "count": "null"
      },
      {
        "title": "B",
        "paragraph": "B",
        "count": "null"
      }
    ]
  },
  {
    "name": "Project",
    "field": "project",
    "values": [
      {
        "title": "NEW_York",
        "paragraph": "test",
        "count": "null"
      }
    ]
  },
  {
    "name": "Designation",
    "field": "designation",
    "values": [
      {
        "title": "Developer",
        "paragraph": "null",
        "count": "null"
      }
    ]
}
]

如果字段相同，则将标题与主标题和次标题进行比较

*若字段和标题相同，则从主字典向辅助字典添加计数

primary = {"Latest":[
  {
    "name": "Employee",
    "field": "employee",
    "values": [
      {
        "title": "A",
        "paragraph": "null",
        "count": "1"
      }
    ]
  },
  {
    "name": "Project",
    "field": "project",
    "values": [
      {
        "title": "NEW_York",
        "paragraph": "null",
        "count": "3"
      }
    ]
  },
  {
    "name": "Designation",
    "field": "designation",
    "values": [
      {
        "title": "Developer",
        "paragraph": "null",
        "count": "1"
      }
    ]
}
]}
secondary = [
  {
    "name": "Employee",
    "field": "employee",
    "values": [
      {
        "title": "A",
        "paragraph": "Test",
        "count": "null"
      },
      {
        "title": "B",
        "paragraph": "B",
        "count": "null"
      }
    ]
  },
  {
    "name": "Project",
    "field": "project",
    "values": [
      {
        "title": "NEW_York",
        "paragraph": "test",
        "count": "null"
      }
    ]
  },
  {
    "name": "Designation",
    "field": "designation",
    "values": [
      {
        "title": "Developer",
        "paragraph": "null",
        "count": "null"
      }
    ]
}
]

初级词典

primary = {"Latest":[
  {
    "name": "Employee",
    "field": "employee",
    "values": [
      {
        "title": "A",
        "paragraph": "null",
        "count": "1"
      }
    ]
  },
  {
    "name": "Project",
    "field": "project",
    "values": [
      {
        "title": "NEW_York",
        "paragraph": "null",
        "count": "3"
      }
    ]
  },
  {
    "name": "Designation",
    "field": "designation",
    "values": [
      {
        "title": "Developer",
        "paragraph": "null",
        "count": "1"
      }
    ]
}
]}
secondary = [
  {
    "name": "Employee",
    "field": "employee",
    "values": [
      {
        "title": "A",
        "paragraph": "Test",
        "count": "null"
      },
      {
        "title": "B",
        "paragraph": "B",
        "count": "null"
      }
    ]
  },
  {
    "name": "Project",
    "field": "project",
    "values": [
      {
        "title": "NEW_York",
        "paragraph": "test",
        "count": "null"
      }
    ]
  },
  {
    "name": "Designation",
    "field": "designation",
    "values": [
      {
        "title": "Developer",
        "paragraph": "null",
        "count": "null"
      }
    ]
}
]

代码如下

def test(second,primary):
    for secondary_value in second:
        for value in primary:
            if secondary_value['title'] ==  value['title']:
                secondary_value['count'] = value['count']
     return secondary_value

for primary in primary['Latest']:
    for secondary_elem in secondary:
        if secondary_elem['field'] == primary['field']:
            test(secondary_elem['values'],primary['values'])
secondary

---

上面的代码工作正常，但它在ide中显示了逻辑错误。在分配如何修复此问题之前，可能会引用局部变量

IDE不应使用此代码向您发出此警告。您使用哪个IDE？pycharm是一个IDE。我将您的代码复制到pycharm 2020.2.3，但没有收到这样的消息。（我甚至用一个额外的变量修改了代码，以查看此消息在我的配置中是否没有被抑制，并且工作正常）return second修复了我的问题为什么

test

会返回任何东西？修改其参数/所有者的函数/方法通常不返回任何值/

None

（例如

list.sort

）或非参数/所有者值（例如

dict.pop

）。如果

second

为空，则会生成原始代码中的警告，然后，

secondary\u value

将是一个未定义的名称，因为不会执行任何循环。

def test(second,primary):
    for secondary_value in second:
        for value in primary:
            if secondary_value['title'] ==  value['title']:
                secondary_value['count'] = value['count']
     return second

for primary in primary['Latest']:
    for secondary_elem in secondary:
        if secondary_elem['field'] == primary['field']:
            test(secondary_elem['values'],primary['values'])
secondary