This probably isn't much help, but I don't think there is a simple way. Perhaps someone will have an alternative method.
There is no attribute for Camera Type so you can't use setAttr like the below.
import maya.cmds as cmds
cmds.setAttr (("cameraShape1._ATTRIBUTE_"), 0)
You can run this MEL to get a list of attributes:
for($at in `listAttr cameraShape1`){
print($at+"\n");
}
Hopefully someone finds a way to help