NameError: name 'flask' is not defined

Question

我在 运行 终端中的这行代码时遇到问题：

$ sudo python app.py 

追溯是：

Traceback (most recent call last):

  File "app.py", line 7, in <module>

   APP = flask.Flask(__name__)

NameError: name 'flask' is not defined

sudo pip install flask

Requirement already satisfied (use --upgrade to upgrade): flask in 

/usr/local/lib/python2.7/dist-packages

Requirement already satisfied (use --upgrade to upgrade): Werkzeug>=0.7 in 

/usr/local/lib/python2.7/dist-packages (from flask)

Requirement already satisfied (use --upgrade to upgrade): Jinja2>=2.4 in 

/usr/local/lib/python2.7/dist-packages (from flask)

Requirement already satisfied (use --upgrade to upgrade): 

itsdangerous>=0.21 in /usr/local/lib/python2.7/dist-packages (from flask)

Requirement already satisfied (use --upgrade to upgrade): markupsafe in 

/usr/lib/python2.7/dist-packages (from Jinja2>=2.4->flask)

Cleaning up...

如有任何帮助，我们将不胜感激。

Answer 1

如果没有安装 flask:

pip install flask

然后

import flask

Answer 2

您问题的答案是：

1. 如果你的导入语句是这样的-

   from flask import Flask
   
   app = flask.Flask(name)
   

   然后会报错：

   NameError: name 'flask' is not defined

2. 如果你的导入语句是这样的 -

   进口烧瓶

   app = Flask(名称)

   然后会报错：

   NameError: name 'Flask' is not defined

* * 以上错误的解决方案 - * *

1. 如果没有安装请通过pip install flask安装flask。

2. 下面的代码将解决您的问题。

   from flask import Flask
   app = Flask(name)   
   

   或

   import flask
   app = flask.Flask(name)
   

Answer 3

就我而言，我已经安装了烧瓶。 我遇到了同样的错误，但这对我有用：

import flask
from flask import Flask