Python 为什么kivy无法导入kivy_时钟？

根据上述代码，我有以下错误

[INFO   ] [Logger      ] Record log in C:\Users\USER\.kivy\logs\kivy_20-05-09_45.txt
[INFO   ] [deps        ] Successfully imported "kivy_deps.angle" 0.1.10
[INFO   ] [Kivy        ] v1.11.1
[INFO   ] [Kivy        ] Installed at "C:\Users\USER\AppData\Local\Programs\Python\Python38-32\lib\site-packages\kivy\__init__.py"
[INFO   ] [Python      ] v3.8.1 (tags/v3.8.1:1b293b6, Dec 18 2019, 22:39:24) [MSC v.1916 32 bit (Intel)]
[INFO   ] [Python      ] Interpreter at "C:\Users\USER\AppData\Local\Programs\Python\Python38-32\python.exe"
[ERROR  ] [Clock       ] Unable to import kivy._clock. Have you perhaps forgotten to compile kivy? Kivy contains Cython code which needs to be compiled. A missing kivy._clock often indicates the Cython code has not been compiled. Please follow the installation instructions and make sure to compile Kivy
 Traceback (most recent call last):
   File "C:/Users/USER/PycharmProjects/Hello world/pop.py", line 4, in <module>
     from kivy.app import App
   File "C:\Users\USER\AppData\Local\Programs\Python\Python38-32\lib\site-packages\kivy\app.py", line 319, in <module>
     from kivy.base import runTouchApp, stopTouchApp
   File "C:\Users\USER\AppData\Local\Programs\Python\Python38-32\lib\site-packages\kivy\base.py", line 26, in <module>
     from kivy.clock import Clock
   File "C:\Users\USER\AppData\Local\Programs\Python\Python38-32\lib\site-packages\kivy\clock.py", line 363, in <module>
     from kivy._clock import CyClockBase, ClockEvent, FreeClockEvent, \
 ModuleNotFoundError: No module named 'kivy._clock'

[INFO][Logger]在C:\Users\USER\.kivy\logs\kivy_20-05-09_45.txt中记录日志
[信息][部门]已成功导入“kivy_部门角度”0.1.10
[INFO][Kivy]v1.11.1
[INFO][Kivy]安装在“C:\Users\USER\AppData\Local\Programs\Python\Python38-32\lib\site packages\Kivy\\uuu init\uuuu.py”
[INFO][Python]v3.8.1（tags/v3.8.1:1b293b6，2019年12月18日，22:39:24）[MSC v.1916 32位（英特尔）]
位于“C:\Users\USER\AppData\Local\Programs\Python\Python38-32\Python.exe”的[INFO][Python]解释器
[错误][时钟]无法导入kivy.\u时钟。你可能忘记编译kivy了吗？Kivy包含需要编译的Cython代码。缺少kivy.\u时钟通常表示Cython代码尚未编译。请遵循安装说明并确保编译Kivy
回溯（最近一次呼叫最后一次）：
文件“C:/Users/USER/PycharmProjects/Hello world/pop.py”，第4行，在
从kivy.app导入应用程序
文件“C:\Users\USER\AppData\Local\Programs\Python38-32\lib\site packages\kivy\app.py”，第319行，在
从kivy.base导入runTouchApp、stopTouchApp
文件“C:\Users\USER\AppData\Local\Programs\Python38-32\lib\site packages\kivy\base.py”，第26行，在
从kivy.clock导入时钟
文件“C:\Users\USER\AppData\Local\Programs\Python38-32\lib\site packages\kivy\clock.py”，第363行，在
来自kivy.\u时钟导入CyClockBase、ClockEvent、FreeClockEvent、\
ModuleNotFoundError:没有名为'kivy.\u clock'的模块

---

我认为kivy_clock和Cython有问题。

因为无论您如何安装kivy，您都没有编译它或安装预编译版本

---

您是否按照kivy.org上的说明进行了操作？

是的，我已经按照所有说明进行了操作，但仍然存在相同的错误

[INFO   ] [Logger      ] Record log in C:\Users\USER\.kivy\logs\kivy_20-05-09_45.txt
[INFO   ] [deps        ] Successfully imported "kivy_deps.angle" 0.1.10
[INFO   ] [Kivy        ] v1.11.1
[INFO   ] [Kivy        ] Installed at "C:\Users\USER\AppData\Local\Programs\Python\Python38-32\lib\site-packages\kivy\__init__.py"
[INFO   ] [Python      ] v3.8.1 (tags/v3.8.1:1b293b6, Dec 18 2019, 22:39:24) [MSC v.1916 32 bit (Intel)]
[INFO   ] [Python      ] Interpreter at "C:\Users\USER\AppData\Local\Programs\Python\Python38-32\python.exe"
[ERROR  ] [Clock       ] Unable to import kivy._clock. Have you perhaps forgotten to compile kivy? Kivy contains Cython code which needs to be compiled. A missing kivy._clock often indicates the Cython code has not been compiled. Please follow the installation instructions and make sure to compile Kivy
 Traceback (most recent call last):
   File "C:/Users/USER/PycharmProjects/Hello world/pop.py", line 4, in <module>
     from kivy.app import App
   File "C:\Users\USER\AppData\Local\Programs\Python\Python38-32\lib\site-packages\kivy\app.py", line 319, in <module>
     from kivy.base import runTouchApp, stopTouchApp
   File "C:\Users\USER\AppData\Local\Programs\Python\Python38-32\lib\site-packages\kivy\base.py", line 26, in <module>
     from kivy.clock import Clock
   File "C:\Users\USER\AppData\Local\Programs\Python\Python38-32\lib\site-packages\kivy\clock.py", line 363, in <module>
     from kivy._clock import CyClockBase, ClockEvent, FreeClockEvent, \
 ModuleNotFoundError: No module named 'kivy._clock'