Execute the code at the named filesystem location and return the resulting
module globals dictionary. As with a script name supplied to the CPython
command line, the supplied path may refer to a Python source file, a
compiled bytecode file or a valid sys.path entry containing a __main__
module (e.g. a zipfile containing a top-level __main__.py file).
For a simple script, the specified code is simply executed in a fresh
module namespace. For a valid sys.path entry (typically a zipfile or
directory), the entry is first added to the beginning of sys.path. The
function then looks for and executes a __main__ module using the
updated path. Note that there is no special protection against invoking
an existing __main__ entry located elsewhere on sys.path if
there is no such module at the specified location.
The optional dictionary argument init_globals may be used to pre-populate
the module’s globals dictionary before the code is executed. The supplied
dictionary will not be modified. If any of the special global variables
below are defined in the supplied dictionary, those definitions are
overridden by run_path().
The special global variables __name__, __spec__, __file__,
__cached__, __loader__ and __package__ are set in the globals
dictionary before the module code is executed (Note that this is a
minimal set of variables - other variables may be set implicitly as an
interpreter implementation detail).
__name__ is set to run_name if this optional argument is not
None and to '<run_path>' otherwise.
If the supplied path directly references a script file (whether as source
or as precompiled byte code), then __file__ will be set to the
supplied path, and __spec__, __cached__, __loader__ and
__package__ will all be set to None.
If the supplied path is a reference to a valid sys.path entry, then
__spec__ will be set appropriately for the imported __main__
module (that is, __spec__.name will always be __main__).
__file__, __cached__, __loader__ and __package__ will be
set as normal based on the module spec.
A number of alterations are also made to the sys module. Firstly,
sys.path may be altered as described above. sys.argv[0] is updated
with the value of file_path and sys.modules[__name__] is updated
with a temporary module object for the module being executed. All
modifications to items in sys are reverted before the function
returns.
Note that, unlike run_module(), the alterations made to sys
are not optional in this function as these adjustments are essential to
allowing the execution of sys.path entries. As the thread-safety
limitations still apply, use of this function in threaded code should be
either serialised with the import lock or delegated to a separate process.
See also
Interface options for equivalent functionality on the
command line (python path/to/script).
Changed in version 3.4: Updated to take advantage of the module spec feature added by
PEP 451. This allows __cached__ to be set correctly in the
case where __main__ is imported from a valid sys.path entry rather
than being executed directly.