python_execfile.py

#In Python3.x this is the closest thing I could come up with to executing a file directly, that matches running python /path/to/somefile.py.

#Notes:

#Uses binary reading to avoid encoding issues
#Garenteed to close the file (Python3.x warns about this)
#defines __main__, some scripts depend on this to check if they are loading as a module or not for eg. if __name__ == "__main__"
#setting __file__ is nicer for exception messages and some scripts use __file__ to get the paths of other files relative to them.
def exec_full(filepath):
    import os
    global_namespace = {
        "__file__": filepath,
        "__name__": "__main__",
    }
    with open(filepath, 'rb') as file:
        exec(compile(file.read(), filepath, 'exec'), global_namespace)

# execute the file
exec_full("/path/to/somefile.py")