python flask 如何修改默认端口号的方法步骤如何修改默认端口号的方法步骤
场景：按照github文档上启动一个flask的app，默认是用5000端口，如果5000端口被占用，启动失败。
样例代码：
from flask import Flask
app = Flask(__name__)
@app.route('/')
def hello():
return 'Hello, World!'
启动的脚本：
$ env FLASK_APP=hello.py flask run
出错信息如下：
renjg@renjg-HP-Compaq-Pro-6380-MT:~/WorkSpace/python/django$ env FLASK_APP=index.py flask run
* Serving Flask app "index.py"
* Environment: production
WARNING: Do not use the development server in a production environment.
Use a production WSGI server instead.
* Debug mode: off
Traceback (most recent call last):
File "/usr/local/bin/flask", line 11, in <module>
sys.exit(main())
File "/usr/local/lib/python2.7/dist-packages/flask/cli.py", line 894, in main
cli.main(args=args, prog_name=name)
File "/usr/local/lib/python2.7/dist-packages/flask/cli.py", line 557, in main
return super(FlaskGroup, self).main(*args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 717, in main
rv = self.invoke(ctx)
File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 956, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 555, in invoke
return callback(*args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/click/decorators.py", line 64, in new_func
return ctx.invoke(f, obj, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 555, in invoke
return callback(*args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/flask/cli.py", line 771, in run_command
threaded=with_threads, ssl_context=cert)
File "/usr/local/lib/python2.7/dist-packages/werkzeug/serving.py", line 814, in run_simple
inner()
File "/usr/local/lib/python2.7/dist-packages/werkzeug/serving.py", line 774, in inner
fd=fd)
File "/usr/local/lib/python2.7/dist-packages/werkzeug/serving.py", line 660, in make_server
passthrough_errors, ssl_context, fd=fd)
File "/usr/local/lib/python2.7/dist-packages/werkzeug/serving.py", line 577, in __init__
self.address_family), handler)
File "/usr/lib/python2.7/SocketServer.py", line 417, in __init__
self.server_bind()
File "/usr/lib/python2.7/BaseHTTPServer.py", line 108, in server_bind
SocketServer.TCPServer.server_bind(self)
File "/usr/lib/python2.7/SocketServer.py", line 431, in server_bind
self.socket.bind(self.server_address)
File "/usr/lib/python2.7/socket.py", line 228, in meth
return getattr(self._sock,name)(*args)
socket.error: [Errno 98] Address already in use
问题：问题：
那么该怎么指定新的端口呢？又如何查看5000端口指定的位置呢？
源码分析，首先clone github上的flask框架，然后直接grep命令查看5000的位置。
renjg@renjg-HP-Compaq-Pro-6380-MT:~/WorkSpace/python/django/flask$ grep 5000 * -nrw
docs/patterns/appdispatch.rst:28: run_simple('localhost', 5000, application, use_reloader=True)
docs/patterns/appdispatch.rst:48: run_simple('localhost', 5000, app,
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