""" 在编写GUI界面中，通常用会有一些按钮，点击后触发事件， 比如去下载一个文件或者做一些操作， 这些操作会耗时，如果不能及时结束，主线程将会阻塞， 这样界面就会出现未响应的状态，因此必须使用多线程来解决这个问题。 """
代码实例
from PyQt5.Qt import (QApplication, QWidget, QPushButton,QThread,QMutex,pyqtSignal)
import sys
import time
qmut_1 = QMutex() # 创建线程锁
qmut_2 = QMutex()
qmut_3 = QMutex()
# 继承QThread
class Thread_1(QThread): # 线程1
def __init__(self):
super().__init__()
def run(self):
qmut_1.lock() # 加锁
values = [1, 2, 3, 4, 5,6,7,8,9,10]
print("==== Thread_1 ====")
for i in values:
print("Thread_1:",i)
time.sleep(0.5) # 休眠
qmut_1.unlock() # 解锁
class Thread_2(QThread): # 线程2
_signal =pyqtSignal()
def __init__(self):
super().__init__()
def run(self):
# qmut_2.lock() # 加锁
values = ["a", "b", "c", "d", "e","f","g","h","i","j","k"]
print("==== Thread_2 ====")
for i in values:
print("Thread_2:",i)
time.sleep(0.5)
# qmut_2.unlock() # 解锁
self._signal.emit()
class Thread_3(QThread): # 线程2
_signal =pyqtSignal()
def __init__(self):
super().__init__()
def run(self):
qmut_3.lock() # 加锁
values = ["a", "b", "c", "d", "e","f","g","h","i","j","k"]
print("==== Thread_3 ====")
for i in values:
print("Thread_3:",i)
time.sleep(0.5)
qmut_3.unlock() # 解锁
self._signal.emit() #执行完毕后，释放信号
class Thread_01(QThread): # 线程1
def __init__(self):
super().__init__()
def run(self):
values = [1, 2, 3, 4, 5]
print("==== Thread_01 ====")
for i in values:
print("Thread_01:",i)
time.sleep(0.5) # 休眠
class Thread_02(QThread): # 线程2
def __init__(self):
super().__init__()
def run(self):
values = ["a", "b", "c", "d", "e"]
print("==== Thread_02 ====")
for i in values:
print("Thread_02:",i)
time.sleep(0.5)
class MyWin(QWidget):
def __init__(self):
super().__init__()
# 按钮初始化
self.btn_01 = QPushButton('按钮_每点一次运行一次', self)
self.btn_01.move(80, 40)
self.btn_01.clicked.connect(self.click_01) # 绑定槽函数
self.btn_02 = QPushButton('按钮_每点一次运行一次', self)
self.btn_02.move(80, 80)
self.btn_02.clicked.connect(self.click_02) # 绑定槽函数
self.btn_1 = QPushButton('按钮_线程锁_多次点击，依次执行(滞后感)', self)
self.btn_1.move(80, 120)
self.btn_1.clicked.connect(self.click_1) # 绑定槽函数
self.btn_2 = QPushButton('按钮_线程锁_收到完成信号后才能再次点击', self)
self.btn_2.move(80, 160)
self.btn_2.clicked.connect(self.click_2) # 绑定槽函数
self.btn_3 = QPushButton('按钮_线程锁_收到完成信号后再次执行', self)
self.btn_3.move(80, 200)
self.btn_3.clicked.connect(self.click_3) # 绑定槽函数
def click_01(self):
self.thread_01 = Thread_01() # 创建线程
self.thread_01.start() # 开始线程
def click_02(self):
self.thread_02 = Thread_02() # 创建线程
self.thread_02.start() # 开始线程
def click_1(self):
self.thread_1 = Thread_1() # 创建线程
self.thread_1.start() # 开始线程
def click_2(self):
self.btn_2.setEnabled(False)
self.thread_2 = Thread_2()
self.thread_2._signal.connect(self.set_btn_2) #信号连接，如果收到信号，就执行对应的函数
self.thread_2.start()
def click_3(self):
self.btn_3.setEnabled(False)
self.thread_3 = Thread_3()
self.thread_3._signal.connect(self.set_btn_3) #信号连接，如果收到信号，就执行对应的函数
self.thread_3.start()
def set_btn_2(self):
self.btn_2.setEnabled(True)
def set_btn_3(self):
self.btn_3.setEnabled(True)
if __name__ == "__main__":
app = QApplication(sys.argv)
myshow = MyWin()
myshow.setWindowTitle("多线程演示")
myshow.setMinimumHeight(500)
myshow.setMinimumWidth(500)
myshow.show()
sys.exit(app.exec_())
运行结果
==== Thread_01 ====
Thread_01: 1
Thread_01: 2
Thread_01: 3
Thread_01: 4
Thread_01: 5
==== Thread_02 ====
Thread_02: a
Thread_02: b
Thread_02: c
Thread_02: d
Thread_02: e
==== Thread_1 ====
Thread_1: 1
Thread_1: 2
Thread_1: 3
Thread_1: 4
Thread_1: 5
Thread_1: 6
Thread_1: 7
Thread_1: 8
Thread_1: 9
==== Thread_2 ====
Thread_2: a
Thread_1: 10
Thread_2: b
Thread_2: c
Thread_2: d
==== Thread_3 ====
Thread_3: a
Thread_2: e
Thread_3: b
Thread_2: f
Thread_3: c
Thread_2: g
Thread_3: d
Thread_2: h
Thread_3: e
Thread_2: i
Thread_3: f
Thread_2: j
Thread_3: g
Thread_2: k
Thread_3: h
运行过程