Engellemeyen, çok iş parçacıklı örnek:
(Beri klavye girişi engelleme gibi input()
sık olduğu işlev blokları) değil bizim yapmak istediğimiz (reklamlarımızın sıkça gibi diğer şeyler yapıyor tutmak için), burada bir çok-sadeleştirilmiş çok dişli örnek göstermek için çalışmasını sağlamak için nasıl senin Ana uygulama, her geldiğinde klavye girişlerini okurken hala .
Bu, arka planda çalışacak bir iş parçacığı oluşturarak, sürekli olarak çağırarak input()
ve aldığı tüm verileri bir kuyruğa geçirerek çalışır.
Bu şekilde, ana iş parçacığınız istediği her şeyi yapmak için bırakılır, kuyrukta bir şey olduğunda ilk iş parçacığından klavye giriş verilerini alır.
1. Çıplak Python 3 kod örneği (yorum yok):
import threading
import queue
import time
def read_kbd_input(inputQueue):
print('Ready for keyboard input:')
while (True):
input_str = input()
inputQueue.put(input_str)
def main():
EXIT_COMMAND = "exit"
inputQueue = queue.Queue()
inputThread = threading.Thread(target=read_kbd_input, args=(inputQueue,), daemon=True)
inputThread.start()
while (True):
if (inputQueue.qsize() > 0):
input_str = inputQueue.get()
print("input_str = {}".format(input_str))
if (input_str == EXIT_COMMAND):
print("Exiting serial terminal.")
break
# Insert your code here to do whatever you want with the input_str.
# The rest of your program goes here.
time.sleep(0.01)
print("End.")
if (__name__ == '__main__'):
main()
2. Yukarıdaki ile aynı Python 3 kodu, ancak kapsamlı açıklayıcı yorumlarla:
"""
read_keyboard_input.py
Gabriel Staples
www.ElectricRCAircraftGuy.com
14 Nov. 2018
References:
- https://pyserial.readthedocs.io/en/latest/pyserial_api.html
- *****https://www.tutorialspoint.com/python/python_multithreading.htm
- *****https://en.wikibooks.org/wiki/Python_Programming/Threading
- /programming/1607612/python-how-do-i-make-a-subclass-from-a-superclass
- https://docs.python.org/3/library/queue.html
- https://docs.python.org/3.7/library/threading.html
To install PySerial: `sudo python3 -m pip install pyserial`
To run this program: `python3 this_filename.py`
"""
import threading
import queue
import time
def read_kbd_input(inputQueue):
print('Ready for keyboard input:')
while (True):
# Receive keyboard input from user.
input_str = input()
# Enqueue this input string.
# Note: Lock not required here since we are only calling a single Queue method, not a sequence of them
# which would otherwise need to be treated as one atomic operation.
inputQueue.put(input_str)
def main():
EXIT_COMMAND = "exit" # Command to exit this program
# The following threading lock is required only if you need to enforce atomic access to a chunk of multiple queue
# method calls in a row. Use this if you have such a need, as follows:
# 1. Pass queueLock as an input parameter to whichever function requires it.
# 2. Call queueLock.acquire() to obtain the lock.
# 3. Do your series of queue calls which need to be treated as one big atomic operation, such as calling
# inputQueue.qsize(), followed by inputQueue.put(), for example.
# 4. Call queueLock.release() to release the lock.
# queueLock = threading.Lock()
#Keyboard input queue to pass data from the thread reading the keyboard inputs to the main thread.
inputQueue = queue.Queue()
# Create & start a thread to read keyboard inputs.
# Set daemon to True to auto-kill this thread when all other non-daemonic threads are exited. This is desired since
# this thread has no cleanup to do, which would otherwise require a more graceful approach to clean up then exit.
inputThread = threading.Thread(target=read_kbd_input, args=(inputQueue,), daemon=True)
inputThread.start()
# Main loop
while (True):
# Read keyboard inputs
# Note: if this queue were being read in multiple places we would need to use the queueLock above to ensure
# multi-method-call atomic access. Since this is the only place we are removing from the queue, however, in this
# example program, no locks are required.
if (inputQueue.qsize() > 0):
input_str = inputQueue.get()
print("input_str = {}".format(input_str))
if (input_str == EXIT_COMMAND):
print("Exiting serial terminal.")
break # exit the while loop
# Insert your code here to do whatever you want with the input_str.
# The rest of your program goes here.
# Sleep for a short time to prevent this thread from sucking up all of your CPU resources on your PC.
time.sleep(0.01)
print("End.")
# If you run this Python file directly (ex: via `python3 this_filename.py`), do the following:
if (__name__ == '__main__'):
main()
Örnek çıktı:
$ python3 read_keyboard_input.py
Klavye girişi için hazır:
hey
input_str = hey
merhaba
input_str = merhaba
7000
input_str = 7000
çıkış
input_str = çıkış
Seri terminalden çıkılıyor.
Son.
Referanslar:
- https://pyserial.readthedocs.io/en/latest/pyserial_api.html
- ***** https://www.tutorialspoint.com/python/python_multithreading.htm
- ***** https://en.wikibooks.org/wiki/Python_Programming/Threading
- Python: Bir üst sınıftan nasıl alt sınıf oluşturabilirim?
- https://docs.python.org/3/library/queue.html
- https://docs.python.org/3.7/library/threading.html
İlgili / Çapraz Bağlı:
- PySerial engellemesiz okuma döngüsü