Question

以下是代码：

    from django.db import models

import datetime
from django.utils import timezone

class data_model(models.Field):
    description = "return and create data objects for visulaizations"

    def __init__(self, days, action):
        self.days = days
        self.action = action

        if(self.action == ""):
            self.action = "inspections"

        getVioPoints(self.action, self.days)
    #end init

    def getVioPoints(self):
        #get points 
        if(self.action == "violations"):
            apendQuery = "where osha_violation_indicator is true"
        elif(self.action == "inspections"):
            apendQuery = "where osha_violation_indicator is false"
        else:
            apendQuery = ""

        from django.db import connections           
        conn = connections['opengov_db'].cursor()

        conn.execute("""
            select distinct a.estab_name, b.latitude, b.longitude, a.site_address, a.site_city, a.site_state, a.site_zip
            from osha_inspection a
            join latitude_longitude_lookup b on cast(a.activity_nr as text)= b.source_data_id
            """,apendQuery,"""
            and close_case_date >= now() - interval """,self.days,""" days'
            and b.latitude is not null; """)

        row = conn.fetchone()
        print row

我收到此错误：

Unhandled exception in thread started by <function wrapper at 0x9d9656c>
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/django/utils/autoreload.py", line 93, in wrapper
    fn(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/commands/runserver.py", line 101, in inner_run
    self.validate(display_num_errors=True)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 310, in validate
    num_errors = get_validation_errors(s, app)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/validation.py", line 34, in get_validation_errors
    for (app_name, error) in get_app_errors().items():
  File "/usr/local/lib/python2.7/dist-packages/django/db/models/loading.py", line 196, in get_app_errors
    self._populate()
  File "/usr/local/lib/python2.7/dist-packages/django/db/models/loading.py", line 75, in _populate
    self.load_app(app_name, True)
  File "/usr/local/lib/python2.7/dist-packages/django/db/models/loading.py", line 99, in load_app
    models = import_module('%s.models' % app_name)
  File "/usr/local/lib/python2.7/dist-packages/django/utils/importlib.py", line 40, in import_module
    __import__(name)
  File "/var/www/opengov/mapPrototypePY/opengov/map/models.py", line 6, in <module>
    class data_model(models.Field):
  File "/var/www/opengov/mapPrototypePY/opengov/map/models.py", line 39, in data_model
    row = conn.fetchone()
NameError: name 'conn' is not defined

我不知道为什么。我知道查询正在运行。但是，这似乎忽略了包含row = conn.fetchone（）的conn。我用谷歌搜索过，没有发现任何注意事项。有任何想法吗？感谢

Answer 1

如评论中所述，这是一个缩进错误。

你在运行时没有得到实际的IndentationError的原因是因为代码在语法上仍然有效。可能发生的事情是代码在类级别被解释为与方法定义处于同一级别：完全可能拥有该级别的代码，例如设置类级变量和编译器（IndentationError是一个编译器） -time exception）不知道此时conn不在范围内。

尝试访问数据时Django NameError

1 个答案: