python-other

while-else

while condition:
    # loop body
    if some_condition:
        break  # exits the loop early
else:
    # this block executes only if the loop wasn't broken

get_nowait()

get_nowait() is a non-blocking method commonly used with queue-like objects, especially those from the queue module in multithreaded programs or multiprocessing.Queue in multiprocessing contexts.

from multiprocessing import Queue
from queue import Empty

q = Queue()
q.put("data")

try:
    item = q.get_nowait()
    print(item)
except Empty:
    print("Queue is empty")
except BrokenPipeError:
    print("Receiver process has closed.")
except EOFError:
    print("Queue connection broken (EOFError).")
except OSError as e:
    print(f"Other OS error: {e}")

judge whether a value is nan in python?

import numpy as np

x = np.nan
if np.isnan(x):
    print("x is NaN")