序言1：当同一个主机上有多个项目并且出现项目名字一致时，进行python manage.py crontab add会出现异常：
序言2：当服务器存在原来的定时任务，如果对原来的定时任务的日志路径进行修改，进行python manage.py crontab add也会出现如下异常，解决方法：在代码pull之前先将任务去除python manage.py crontab remove，如果已经pull下来了，可以执行 crontab -e 对定时任务进行修改成新的一致，然后进行任务创建
'Run "python manage.py crontab add" again to resolve this issue!' % job_hash
RuntimeError: No job with hash 93db807d32a4da67c4524a4b25422208 found. It seems the crontab is out of sync with your settings.CRONJOBS. Run "python manage.py crontab add" again to resolve this issue!
CRONTAB_COMMENT
- used for marking the added contab-lines for removing, default value includes project name to distinguish multiple projects on the same host and user
- default: ‘django-crontabs for ‘ + CRONTAB_DJANGO_PROJECT_NAME
- 用于标记添加的和要删除的contab行，默认值包括项目名称，以区分同一主机和用户上的多个项目
- 默认值：'django-crontabs for'+ CRONTAB_DJANGO_PROJECT_NAME
如果两个项目名字一致会导致无法区别
CRONTAB_COMMENT = '新的自己命名'
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CRONTAB_LOCK_JOBS
- prevent starting a job if an old instance of the same job is still running
- default: False
- since 0.5.0
- 如果同一作业的旧实例仍在运行，则阻止启动该作业
- 默认值：False
- 自0.5.0
CRONTAB_EXECUTABLE
- path to the crontab executable of your os
- default: ‘/usr/bin/crontab’
- 操作系统的crontab可执行文件的路径
- 默认值：'/ usr / bin / crontab'
CRONTAB_DJANGO_PROJECT_NAME
- the name of your django project, used to build path path to manage.py and to mark the jobs in contrab via comment for later removing
- default is read from DJANGO_SETTINGS_MODULE environment variable
- django项目的名称，用于建立路径manage.py的路径，并通过注释将工作标记为禁忌，以便以后删除
- 默认是从DJANGO_SETTINGS_MODULE环境变量读取的
CRONTAB_DJANGO_MANAGE_PATH
- path to manage.py file (including the manage.py itself, i.e. ‘/home/john/web/manage.py’)
- default is build using DJANGO_PROJECT_NAME
- manage.py文件的路径（包括manage.py本身，即'/home/john/web/manage.py'）
- 默认为使用DJANGO_PROJECT_NAME构建
CRONTAB_DJANGO_SETTINGS_MODULE
- dotted python path to the settings module to run the command with
- default is the common one from the environment variable and will not be overwritten
- since 0.6.0
- 设置模块的点分python路径，以运行命令
- 默认是环境变量中的通用变量，不会被覆盖
- 自0.6.0
CRONTAB_PYTHON_EXECUTABLE
- path to the python interpreter executable used to run the scheduled job
- default uses the interpreter executable used to add the jobs (via ‘python manage.py crontab add’)
- 用于运行计划作业的python解释器可执行文件的路径
- 默认使用用于添加作业的解释器可执行文件（通过“ python manage.py crontab add”）
CRONTAB_COMMAND_PREFIX
something you wanne do or declare before each job gets executed. A good point for environment variables.
default: ‘’ (empty string)
example: ‘STAGE=production’
您希望在执行每个作业之前执行或声明的操作。环境变量的一个好地方。
默认值：''（空字符串）
示例：“ STAGE = production”
CRONTAB_COMMAND_SUFFIX
- something you wanne do after each job was executed.
- default: ‘’ (empty string)
- example: ‘2>&1’
- 每个工作执行完后您想做的事情。
- 默认值：''（空字符串）
- 例如：“ 2>＆1”
