小编Sap*_*aka的帖子

import time

def taym():
    time.sleep(5)

def getprice():
    myfile = open('C:\\Users\\DELL\\Desktop\\Python\\html1.html')
    txt = myfile.read()
    t = txt.find("$")
    it = float(txt[t-4:t])

it=8
while it != 1000:
    getprice()
    if it <= 4.74:
        print("Price is Ok!")
        taym()
    else: 
        print("The price of the coffee beans is "+txt[t-4:t+1])
        taym()

当我在python3中运行此代码时,我收到如下错误消息:

"print("The price of the coffee beans is "+txt[t-4:t+1])
NameError: name 'txt' is not defined."

我知道我可以使用getprice()循环内部的原始代码,但是当我有一个我调用的函数时,我需要知道为什么它不起作用.