我对www.example.com中的一个表做了一些更改models.py，并尝试使用“pythonmanage.pymigrate”迁移它，但这需要几个小时。（列）名称，现在已经运行了两个多小时了，运行的很平稳（我想）在今天早上早些时候我创建表的几分钟内。赛季开始是做出改变的模型。
下面是models.py现在的样子：

from django.db import models
from django.contrib.gis.db import models as gismodels
# from django.contrib.gis import admin

# Create your models here.

class Location(models.Model): # table name automatically chirps_location
    locationID = models.IntegerField(default=0, primary_key=True)
    lat = models.FloatField(default=0.0)
    lon = models.FloatField(default=0.0)
    geom = gismodels.PointField(null=True)
    objects = gismodels.GeoManager()
    def __unicode__(self):
        return u"LocationID: " + unicode(self.locationID)

# admin.site.unregister(Location)
# admin.site.register(Location, admin.OSMGeoAdmin)

class Rainfall(models.Model):
    location = models.ForeignKey(Location)
    year = models.IntegerField(default=0)
    pentad_num = models.IntegerField(default=0)        
    pentad_val = models.FloatField(default=0.0)

    class Meta:
        ordering = ['location', 'year', 'pentad_num']

    def __unicode__(self):
        return u"LocationID: " + unicode(self.location.locationID) + u" Year: " + unicode(self.year) + u" Pentad: " + unicode(self.pentad_num)

class Start_of_Season(models.Model):
    location = models.ForeignKey(Location)
    crop = models.CharField(default='', max_length=40)
    year = models.IntegerField(default=0)
    first_rain = models.IntegerField(default=0)
    onset_rain = models.IntegerField(default=0)
    start_season = models.IntegerField(default=0)

    class Meta:
        ordering = ['location', 'crop', 'year']    

    def __unicode__(self):
        return u"LocationID: " + unicode(self.location.locationID) + u" Year: " + unicode(self.year) + u" Start of Season pentad: " + unicode(self.start_season)

还有一些奇怪的行为，我无法解释在此之前发生的事情，所以我会给予一个简短的纲要，所有的情况下，这一切都是相关的。
起初，我的Start_of_Season类看起来是这样的（注意，唯一的区别是最后3个字段的名称）：

class Start_of_Season(models.Model):
    location = models.ForeignKey(Location)
    crop = models.CharField(default='', max_length=40)
    year = models.IntegerField(default=0)
    first_rain_pentad = models.IntegerField(default=0)
    onset_rain_pentad = models.IntegerField(default=0)
    start_season_pentad = models.IntegerField(default=0)

    class Meta:
        ordering = ['location', 'crop', 'year']    

    def __unicode__(self):
        return u"LocationID: " + unicode(self.location.locationID) + u" Year: " + unicode(self.year) + u" Start of Season pentad: " + unicode(self.start_season)

将其迁移为：

python manage.py makemigrations
python manage.py migrate

似乎进展顺利。
但是当我运行一个python脚本（节选）向这个新创建的Start_of_Season表添加行时：

os.environ.setdefault("DJANGO_SETTINGS_MODULE", "access.settings")
from chirps.models import Location, Rainfall, Start_of_Season
django.setup()

try:
    with transaction.atomic():
        for loc in Location.objects.all():
            locID = loc.locationID
            for yr in range(1981, 2014):
                # some computations to find: c1, c2, c3
                start_of_season = Start_of_Season()
                start_of_season.location = Location.objects.get(locationID = locID)
                start_of_season.crop = 'millet'
                start_of_season.year = yr
                start_of_season.first_rain_pentad = c1
                start_of_season.onset_rain_pentad = c2
                start_of_season.start_season_pentad = c3
                start_of_season.save()

起初，这些行从未添加到数据库中（至少根据psql）。然后我得到错误“start_of_season没有属性start_season”，这很奇怪，因为我从未尝试在我的脚本中访问该属性，只访问了“start_of_season.start_season_pentad”
然后我想，好吧，我会改变字段的名称，这样start_of_season does就有了这个属性，于是我编辑了models.py，使其看起来像文章顶部的摘录。
在更新www.example.com之后models.py，

python manage.py makemigrations

运行，无错误：

(access_mw)mwooten@ip-10-159-67-226:~/dev/access$ python manage.py makemigrations
Did you rename start_of_season.first_rain_pentad to start_of_season.first_rain (a IntegerField)? [y/N] y
Did you rename start_of_season.onset_rain_pentad to start_of_season.onset_rain (a IntegerField)? [y/N] y
Did you rename start_of_season.start_season_pentad to start_of_season.start_season (a IntegerField)? [y/N] y
Migrations for 'chirps':
  0010_auto_20150901_1454.py:
    - Rename field first_rain_pentad on start_of_season to first_rain
    - Rename field onset_rain_pentad on start_of_season to onset_rain
    - Rename field start_season_pentad on start_of_season to start_season

，但是：

python manage.py migrate

被困在这里几个小时了

(access_mw)mwooten@ip-10-159-67-226:~/dev/access$ python manage.py migrate
Operations to perform:
  Synchronize unmigrated apps: staticfiles, gis, djgeojson, messages, leaflet
  Apply all migrations: admin, chirps, contenttypes, auth, sessions
Synchronizing apps without migrations:
  Creating tables...
    Running deferred SQL...
  Installing custom SQL...
Running migrations:
  Rendering model states... DONE
  Applying chirps.0010_auto_20150901_1454...

我不明白为什么这要花这么长时间，因为创建实际的表并没有花这么长时间。我也不知道为什么我会得到其他错误。你知道发生了什么吗？
谢谢