Argument numbers and types for Python SD Card library

I can get most SD card functions (except text file functions) to operate in C++ Vexcode Pro. However, when I try to use the corresponding functions in Vexcode V5 Python, I get the error:
In TypeError: argument num/types mismatch.
I have used arguments based on those for C++ which do work in V5 Pro. Please provide required Python types and arguments and any restrictions for the arguments passed to brain.sdcard.:
appendfile(), exists(), filesize(), loadfile(), savefile(), and size(), Please also all requirements for file name path descriptors. A working example of Python code for each call would be appreciated.