导入错误:无法导入名称'opentype‘

Question

我正在尝试遵循在Raspberry Pi 2 B+上运行的py代码中使用Firebase的说明。在python 3上运行时，会发生一些不好的事情。

我已经在我的脚本中包含了pyrebase，但是当我使用python3运行它时，我得到了下面的结果(请参见下面的内容)。我一直在从事各种其他语言的工作，但我只是选择了python和Raspberry Pi作为我心目中的项目。

这篇文章将包含我的代码和我在运行代码时得到的终端输出

我的代码：

#import Libraries
import RPi.GPIO as GPIO
import time
import pyrebase
import os

#Firebase Configuration
config = {
          "apiKey": "apiKey",
          "authDomain": "rpitest-xxxxx.firebaseapp.com",
          "databaseURL": "rpitest-xxxxx.firebaseio.com",
          "storageBucket": "rpitest-xxxxx.appspot.com"
}

firebase = pyrebase.initialize_app(config)

#GPIO Setup
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(22, GPIO.OUT)

#Firebase Database Intialization
db = firebase.database()

#While loop to run until user kills program
while(True):
    #Get value of LED 
    led = db.child("led").get()

    #Sort through children of LED(we only have one)
    for user in led.each():
    #Check value of child(which is 'state')
      if(user.val() == "OFF"):
          #If value is off, turn LED off
          GPIO.output(22, False)
      else:
          #If value is not off(implies it's on), turn LED on
          GPIO.output(22, True)

      #0.1 Second Delay
      time.sleep(0.1) 

命令：

    pi@raspberrypi:~/Desktop/LearnPython $ sudo python3 IoTLED.py

输出：

    pi@raspberrypi:~/Desktop/LearnPython $ sudo python3 IoTLED.py
    Traceback (most recent call last):
      File "IoTLED.py", line 4, in <module>
        import pyrebase
      File "/usr/local/lib/python3.5/distpackages/pyrebase/__init__.py", line 1, in <module>
        from .pyrebase import initialize_app
      File "/usr/local/lib/python3.5/distpackages/pyrebase/pyrebase.py", line 17, in <module>
        from oauth2client.service_account import ServiceAccountCredentials
      File "/usr/local/lib/python3.5/dist-packages/oauth2client/service_account.py", line 26, in <module>
        from oauth2client import crypt
      File "/usr/local/lib/python3.5/dist-packages/oauth2client/crypt.py", line 23, in <module>
        from oauth2client import _pure_python_crypt
      File "/usr/local/lib/python3.5/dist-packages/oauth2client/_pure_python_crypt.py", line 24, in <module>
        from pyasn1_modules.rfc2459 import Certificate
      File "/usr/local/lib/python3.5/dist-packages/pyasn1_modules/rfc2459.py", line 20, in <module>
        from pyasn1.type import opentype
      ImportError: cannot import name 'opentype'

我的怀疑是：

我怀疑opentype库丢失了。

结尾备注：

我真的被困在这一点上一天多了。我需要帮助。非常感谢你，我真的很感谢你的帮助。

Answer 1

我也遇到了类似的问题，下面的代码帮我解决了这个问题：

pip install --upgrade google-auth-oauthlib

在我的设置中，google-auth-oauthlib依赖项似乎已过期。requirements.txt (https://github.com/google/aiyprojects-raspbian/blob/voicekit/requirements.txt)中的版本为0.1.0。我正在使用语音工具包，但同样的情况也适用于您的设置。

有关更多详细信息，请参阅此问题：ImportError: cannot import name 'opentype' on new installation

也可以在树莓派论坛上看到这个：https://www.raspberrypi.org/forums/viewtopic.php?f=114&t=198933&p=1241439#p1241439

Answer 2

你也可以试试这个。这对我很管用。

pip install --upgrade pyasn1-modules