TypeError: GetSize()缺少一个必需的位置参数：'self‘

Question

如果代码如下所示，我将得到以下错误：

TypeError: GetSize()缺少一个必需的位置参数：'self‘

import PySpin

system = PySpin.System.GetInstance()
cam_list = system.GetCameras()

# This works:

numCams  = cam_list.GetSize()

# this fails:

numCams  = PySpin.CameraList.GetSize()

print ("No. of cams: ", numCams)

为什么？

编辑：

class myMain(object):
    def main(self):
        numCams  = PySpin.CameraList.GetSize()
        print ("No. of cams: ", numCams)

Answer 1

尝试在调用它之前初始化它。

cams = PySpin.CameraList()
numCams = cams.GetSize()
print ("No. of cams: ", numCams)