python+kivy小程序出错，代码如下：
import os
os.environ['KIVY_IMAGE'] = 'pil,sdl2'
from kivy.app import App
from kivy.uix.floatlayout import FloatLayout
class SizeFloat(FloatLayout):
def __init__(self, **kwargs):
super().__init__(**kwargs)
class SizeApp(App):
def build(self):
return SizeFloat()
if __name__ == '__main__':
SizeApp().run()
运行后出错信息如下：
[CRITICAL] [Window ] Unable to find any valuable Window provider. Please enable debug logging (e.g. add -d if running from the command line, or change the log level in the config) and re-run your app to identify potential causes
sdl2 - Exception: SDL2: Unable to load image
File "D:vs2017SharedPython37_86libsite-packageskivycore__init__.py", line 70, in core_select_lib
cls = cls()
File "D:vs2017SharedPython37_86libsite-packageskivycorewindowwindow_sdl2.py", line 152, in __init__
super(WindowSDL, self).__init__()
File "D:vs2017SharedPython37_86libsite-packageskivycorewindow__init__.py", line 982, in __init__
self.create_window()
File "D:vs2017SharedPython37_86libsite-packageskivycorewindowwindow_sdl2.py", line 311, in create_window
super(WindowSDL, self).create_window()
File "D:vs2017SharedPython37_86libsite-packageskivycorewindow__init__.py", line 1268, in create_window
self.render_context = RenderContext()
File "kivygraphicsinstructions.pyx", line 783, in kivy.graphics.instructions.RenderContext.__init__
File "D:vs2017SharedPython37_86libsite-packageskivycoreimage__init__.py", line 561, in __init__
self.filename = arg
File "D:vs2017SharedPython37_86libsite-packageskivycoreimage__init__.py", line 756, in _set_filename
mipmap=self._mipmap, nocache=self._nocache)
File "D:vs2017SharedPython37_86libsite-packageskivycoreimage__init__.py", line 460, in load
im = loader(filename, **kwargs)
File "D:vs2017SharedPython37_86libsite-packageskivycoreimage__init__.py", line 223, in __init__
self._data = self.load(filename)
File "D:vs2017SharedPython37_86libsite-packageskivycoreimageimg_sdl2.py", line 47, in load
raise Exception('SDL2: Unable to load image')
[CRITICAL] [App ] Unable to get a Window, abort.
Process finished with exit code 1
经查阅大家解决方案，发现是pcCharm的环境未配置正确，解决方案如下：
在pcCharm中按下“ctrl+alt+s”，调出如下Settings界面：
找到Project:xxxx（xxxx为当前的项目名称）
并点击“Python Interpreter”
单击“Python Interpreter”，显示“Python Interpreter:框”在右侧有一个“齿轮”按钮，单击，如图所示：
单击“齿轮”，显示出“add...”，“Show all”，单击“add...”，如下所示：
单击"virtualenv environment”，右侧中选择"existing environment",勾选"make available to all projects”，并单击最右侧“...”图标，如下所示：
弹出“select python interpreter”中，选中“*****kv-demon-envscriptspython.exe”，单击“OK”，如下所示：
返回界面，确认interpreter右侧的路径框中，已经变更为“*****kv-demon-envscriptspython.exe”，再单击ok，如下所示：
回到上一界面，pcCharm会自动更新安装对应的包，稍等一会儿，会形成一下清单，可以看到，python interpreter右侧的框是“*****kv-demon-envscriptspython.exe”，下面列出了package清单，现有的版本，最新的版本，如下所示，再单击“ok"
再运行程序代码，成功解决！
