未定义全局变量-Python

我对全局变量有疑问.返回错误

search = Search.Search(pattern,b)
NameError: global name 'b' is not defined   

但是我已经定义了这个全局变量.我试图将其甚至放入搜索功能.我认为Windows上没有问题.我正在尝试在Linux / Unix上运行该程序.

您对如何避免此错误有任何建议？

# -*- coding: utf-8 -*-
from flask import Flask
from flask import request
from flask import render_template


import Search
import B

app = Flask(__name__)

global b

@app.route('/')
def my_form():
    return render_template('my-form.html')

def setup():
    global b
    b = B.B()  

@app.route('/', methods=['POST'])
def search():
    global b
    from time import time

    pattern = request.form['text']
    ...
    se = Search.Search(pattern,b)
    ...
    ...
    ...

app.debug=True
if __name__ == '__main__':
    setup()
    app.run()

解决方法:

app = Flask(__name__)

global b

此处的全局b语句实际上并未为您创建变量.您需要自己分配一些东西.

app = Flask(__name__)

b = None #or whatever you want the starting value to be

标签：python,error-handling,global-variables
来源： https://codeday.me/bug/20191012/1896757.html