kopia lustrzana https://github.com/micropython/micropython
34 wiersze
1.3 KiB
Plaintext
34 wiersze
1.3 KiB
Plaintext
.. Preamble section inserted into generated output
|
|
|
|
Positional-only Parameters
|
|
--------------------------
|
|
|
|
To save code size, many functions that accept keyword arguments in CPython only accept positional arguments in MicroPython.
|
|
|
|
MicroPython marks positional-only parameters in the same way as CPython, by inserting a ``/`` to mark the end of the positional parameters. Any function whose signature ends in ``/`` takes *only* positional arguments. For more details, see `PEP 570 <https://peps.python.org/pep-0570/>`_.
|
|
|
|
Example
|
|
~~~~~~~
|
|
|
|
For example, in CPython 3.4 this is the signature of the constructor ``socket.socket``::
|
|
|
|
socket.socket(family=AF_INET, type=SOCK_STREAM, proto=0, fileno=None)
|
|
|
|
However, the signature documented in :func:`MicroPython<socket.socket>` is::
|
|
|
|
socket(af=AF_INET, type=SOCK_STREAM, proto=IPPROTO_TCP, /)
|
|
|
|
The ``/`` at the end of the parameters indicates that they are all positional-only in MicroPython. The following code works in CPython but not in most MicroPython ports::
|
|
|
|
import socket
|
|
s = socket.socket(type=socket.SOCK_DGRAM)
|
|
|
|
MicroPython will raise an exception::
|
|
|
|
TypeError: function doesn't take keyword arguments
|
|
|
|
The following code will work in both CPython and MicroPython::
|
|
|
|
import socket
|
|
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
|