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flask-script是flask的命令行扩展包，使用它可以通过命令行的形式操作flask项目, 例如，可通过命令启动一个发版本的服务器,设置数据库和定时任务等。
类似django的manage.py提供的命令，不同的是使用flask-script可以自定义更多的命令。
一般在虚拟环境中安装
我要评论(flask_env) mark@ocarina:~/pycharmprojects/flask_one$ pip install flask-script
collecting flask-script
downloading https://files.pythonhosted.org/packages/00/a4/cd587b2b19f043b65bf33ceda2f6e4e6cdbd0ce18d01a52b9559781b1da6/flask-script-2.0.6.tar.gz (43kb)
100% |████████████████████████████████| 51kb 229kb/s
requirement already satisfied: flask in /home/mark/.virtualenvs/flask_env/lib/python3.6/site-packages (from flask-script) (1.0.2)
requirement already satisfied: werkzeug>=0.14 in /home/mark/.virtualenvs/flask_env/lib/python3.6/site-packages (from flask->flask-script) (0.14.1)
requirement already satisfied: itsdangerous>=0.24 in /home/mark/.virtualenvs/flask_env/lib/python3.6/site-packages (from flask->flask-script) (1.1.0)
requirement already satisfied: click>=5.1 in /home/mark/.virtualenvs/flask_env/lib/python3.6/site-packages (from flask->flask-script) (7.0)
requirement already satisfied: jinja2>=2.10 in /home/mark/.virtualenvs/flask_env/lib/python3.6/site-packages (from flask->flask-script) (2.10)
requirement already satisfied: markupsafe>=0.23 in /home/mark/.virtualenvs/flask_env/lib/python3.6/site-packages (from jinja2>=2.10->flask->flask-script) (1.1.0)
building wheels for collected packages: flask-script
running setup.py bdist_wheel for flask-script ... done
stored in directory: /home/mark/.cache/pip/wheels/1c/17/70/4598e6dba4bec58c1b59552c6409272aea31978ab8159f11a1
successfully built flask-script
installing collected packages: flask-script
successfully installed flask-script-2.0.6
(flask_env) mark@ocarina:~/pycharmprojects/flask_one$
安装好了，不会用，怎么办？
在pycharm中点flask_script想进去看看，结果只进入了__init__.py中，看到如下内容：
class manager(object):
"""
controller class for handling a set of commands.
typical usage::
class print(command):
def run(self):
print "hello"
app = flask(__name__)
manager = manager(app)
manager.add_command("print", print())
if __name__ == "__main__":
manager.run()
on command line::
python manage.py print
> hello
:param app: flask instance, or callable returning a flask instance.
:param with_default_commands: load commands **runserver** and **shell**
by default.
:param disable_argcomplete: disable automatic loading of argcomplete.
"""
导入flask_script中的manager,command
自定义的命令需要在command的子类中重写run方法，在此方法中定义命令需要做什么事
实例化manager(可以接收一个flask对象作为参数)，调用manager对象的add_command('命令', 自定义命令类实例)
from flask_script import manager, command
from app import app # flask对象
class testcommand(command):
"""
测试命令
"""
def run(self): # 重写command的run方法
# 使用命令在控制台输出信息
print("server run on xxx:80...")
manager = manager(app) # 将flask_script与flask联系起来
manager.add_command('test', testcommand())
if __name__ == '__main__':
manager.run()
在manage.py中执行manage.run()可以查看这个manage中包含的命令详情
/home/mark/.virtualenvs/flask_env/bin/python3.6 /home/mark/pycharmprojects/flask_one/manage.py
usage: manage.py [-?] {test,shell,runserver} ...
positional arguments:
{test,shell,runserver}
test 测试命令
shell runs a python shell inside flask application context.
runserver runs the flask development server i.e. app.run()
optional arguments:
-?, --help show this help message and exit
process finished with exit code 2
在命令行执行python manage.py test
(flask_env) mark@ocarina:~/pycharmprojects/flask_one$ python manage.py test server run on xxx:80...
导入flask_script中的manager,实例化之后使用@manager.command装饰器装饰一个函数，这样，这个函数名就成为一个命令，函数中的代码会在执行这个命令后执行。
from flask_script import manager
from app import app
manager = manager(app)
@manager.command
def music():
"""
小妞，给爷唱一个
"""
print("客官不可以，不可以摸我那里....")
if __name__ == '__main__':
manager.run()
使用manager.run()查看
/home/mark/pycharmprojects/flask_one/manage.py
usage: manage.py [-?] {music,shell,runserver} ...
positional arguments:
{music,shell,runserver}
music 小妞，给爷唱一个
shell runs a python shell inside flask application context.
runserver runs the flask development server i.e. app.run()
在命令行执行python manage.py music
(flask_env) mark@ocarina:~/pycharmprojects/flask_one$ python manage.py music 客官不可以，不可以摸我那里....
将命令定义在其他模块中，再引入到manage.py，将manage.py作为主命令模块。
from flask_script import manager
# 不作为主命令模块，也就是说命令行是python manage.py xxx..
# 使用manage.py 而不是当前模块，这里的manager()就不用传如flask对象了
db_manager = manager()
@db_manager.command
def migrate():
"""
数据迁移命令
"""
print("执行数据迁移...")
在manage.py中的引入方式：manger.add_command('prefix',manager对象)
from flask_script import manager
from app import app
from db_manager import db_manager
manager = manager(app)
# db是前缀 执行命令方式 python manage.py db migrate
manager.add_command('db', db_manager)
if __name__ == '__main__':
manager.run()
执行结果：
(flask_env) mark@ocarina:~/pycharmprojects/flask_one$ python manage.py db migrate 执行数据迁移...
可以使用manger.option()装饰器
命令函数可以接收参数
弹出确认操作：
@db_manager.command
def drop_data():
if prompt_bool("你真的要删除这些数据吗？后果自负哦..\t\n"
"输入y删除,n取消"):
print('数据已删除...')
else:
print("就知道你不敢")
----------------------------------------
(flask_env) mark@ocarina:~/pycharmprojects/flask_one$ python manage.py db drop_data
你真的要删除这些数据吗？后果自负哦..
输入y删除,n取消 [n]: n
就知道你不敢
(flask_env) mark@ocarina:~/pycharmprojects/flask_one$
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