micropython/tests/extmod/usocket_udp_nonblock.py

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# test non-blocking UDP sockets
try:
import usocket as socket, uerrno as errno
except ImportError:
try:
import socket, errno
except ImportError:
print("SKIP")
raise SystemExit
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.bind(socket.getaddrinfo("127.0.0.1", 8000)[0][-1])
s.settimeout(0)
try:
s.recv(1)
except OSError as er:
print("EAGAIN:", er.errno == errno.EAGAIN)