Check if a file or path exists using GHPython

Hello,

I'm exporting ViewCaptures from a GHPython script, and would like to check if a picture with the same name already exists so as not to overwrite anything.

I'm looking for something like "rs.IsFile()". If "picture" exists, it should try "picture_1", if not "picture_2" and so on:

path = "C:\Users\MyName\Desktop\MyFolder\"

filename = "picture"

if rs.IsFile(path+filename): newname = filename+"_1"

else: newname = filename

count = 0

while rs.IsFile(path+newname):