I am used to working in python 2.7 so there was some new things like the print function being different. So excuse my ignorance. I am also pretty new to programming.
Backslashes (used by you as Windows path separators) signal escape sequences in Python strings. Double the backslashes or use a raw string literal:
"F:\\Pro_Projects\\NAIP2013\\raster.sde"
or
r"F:\Pro_Projects\NAIP2013\raster.sde"
Windows also accepts forward slashes in paths, avoiding the issue altogether:
"F:/Pro_Projects/NAIP2013/raster.sde"