python-shell-exec-path

python-shell-exec-path is a variable defined in `python.el'.
Its value is

nil

• This variable is safe as a file local variable if its value
  satisfies the predicate `listp'.

Documentation:
List of path to search for binaries.
This variable follows the same rules as `exec-path' since it
merges with it before the process creation routines are called.
When this variable is nil, the Python shell is run with the
default `exec-path'.

You can customize this variable.