NameError:名称

问题描述：

我有以下代码，并在尝试运行它时收到以下错误消息:

I have the following code and get the following error message when trying to run it:

NameError: name 'true' is not defined

我试图让Raspberry Pi在端口17上收到输入时运行HTML脚本:

I am trying to make the Raspberry Pi run a HTML script when it receives input on port 17:

import RPi.GPIO as GPIO
import time
import os

inputSignal = 17
GPIO.setmode(GPIO.BCM)
GPIO.setup(inputSignal,GPIO.IN)
while true:
    if (GPIO.input(inputSignal)):
        os.system("html /home/pi/index.html")
    else:
        print("No Input")

答

Python的布尔常量大写: True 和 False 分别使用大写字母T和F.

Python’s boolean constants are capitalized: True and False with upper case T and F respectively.

小写变体只是变量的有效免费名称，因此您可以将它们用于任何所需的变量，例如true = False(不推荐； P).

The lower-case variants are just valid free names for variables, so you could use them for whatever you want, e.g. true = False (not recommended ;P).

NameError:名称"true"未定义

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