python - flask 不打印到控制台

Question

我是 flask 的新手，我正在尝试添加打印信息来调试服务器端代码。当使用 debug=True 启动我的 flask 应用程序时，我无法将任何信息打印到控制台

我尝试改用日志记录，但没有成功。那么如何用控制台调试flask程序呢。

@app.route('/getJSONResult', methods=['GET', 'POST'])
def getJSONResult():

    if request.method == 'POST':
        uut = request.form['uut']
        notes = request.form['notes']
        temperature = request.form['temperature']

        logging.info("enter getJSONReuslt")
        print('enter getJSONReuslt')
        filter_by_query = {k: v for k, v in {
            'uut': uut, 'notes': notes, 'temperature': temperature}.items() if v != ""}
        s = session.query(UUT_TEST_INFO).filter_by(**filter_by_query).first()
        return jsonify(s.serialize)

if __name__ == '__main__':
    app.secret_key = ''.join(random.choice(
        string.ascii_uppercase + string.digits) for x in range(32))
    app.debug = True
    app.run(host='127.0.0.1', port=5000)


> 127.0.0.1 - - [07/Jun/2017 15:20:48] "GET /qyer HTTP/1.1" 200 -
> 127.0.0.1 - - [07/Jun/2017 15:20:48] "GET /static/css/bootstrap.min.css HTTP/1.1" 200 -
> 127.0.0.1 - - [07/Jun/2017 15:20:48] "GET /static/js/bootstrap.min.js HTTP/1.1" 200 -
> 127.0.0.1 - - [07/Jun/2017 15:20:51] "GET /static/css/bootstrap.min.css.map HTTP/1.1" 200 -
> 127.0.0.1 - - [07/Jun/2017 15:21:58] "POST /getJSONResult HTTP/1.1" 500 -

我修复了服务器端 500 错误问题，现在请求获取 200 代码，控制台显示以下信息

$ python project.py
INFO:werkzeug: * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
INFO:werkzeug: * Restarting with stat
WARNING:werkzeug: * Debugger is active!
INFO:werkzeug: * Debugger pin code: 158-624-607
INFO:werkzeug:127.0.0.1 - - [08/Jun/2017 11:33:33] "GET /qyer HTTP/1.1" 200 -
INFO:root:Enter getJSONResult
INFO:werkzeug:127.0.0.1 - - [08/Jun/2017 11:33:43] "POST /getJSONResult HTTP/1.1" 200 -

仍然没有来自打印命令的信息

Answer 1

试试这个，看看是否有帮助:

对于python2:

from __future__ import print_function
import sys

print('This is error output', file=sys.stderr)
print('This is standard output', file=sys.stdout)

对于python3，您不需要从future print_function 导入:

import sys

print('This is error output', file=sys.stderr)
print('This is standard output', file=sys.stdout)

看看它是否有助于打印到控制台。