NameError: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 

跟踪是:

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,将不胜感激.

Answer 1

你的问题的答案是：

1. 如果您的导入语句是这样的 -

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

   那么它会给出错误：

   NameError：未定义名称“烧瓶”

2. 如果您的导入语句是这样的 -

   进口烧瓶

   app = Flask（名称）

   那么它会给出错误：

   NameError: 名称 'Flask' 未定义

* * 以上错误的解决方案 - * *

1. pip install flask如果没有安装，请安装flask 。

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)
   

Answer 2

如果没有安装烧瓶:

pip install flask

然后

import flask