名称错误：未定义名称“flask”

Question

我在终端中运行这行代码时遇到问题：

$ sudo python app.py 

回溯是：

Traceback (most recent call last):

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

   APP = flask.Flask(__name__)

NameError: name 'flask' is not defined

sudo pip安装烧瓶

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...

任何帮助都将不胜感激。

Answer 1

如果未安装烧瓶：

pip install flask

那么

import flask

Answer 2

问题的答案是：

1. 如果你的进口声明是这样的-

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

   然后它将给出错误：

   NameError: name 'flask' is not defined

2. 如果你的进口声明是这样的-

   进口烧瓶

   app=烧瓶（名称）

   然后它将给出错误：

   NameError: name 'Flask' is not defined

**上述错误的解决方案-**

1. 如果没有安装，请通过pip install flask安装烧瓶。

2. 下面的代码将解决您的问题。

   from flask import Flask
   app = Flask(name)   
   

   或者

   import flask
   app = flask.Flask(name)