提交文章 fake thread

Author: alisx

taiyangxue/README.md

@@ -1,5 +1,6 @@
 # Python 代码实例
 
+- [fake-thread](https://github.com/JustDoPython/python-examples/tree/master/taiyangxue/fake-thread) : Python 多线程居然是 —— 假的？
 - [logging-train](https://github.com/JustDoPython/python-examples/tree/master/taiyangxue/logging-train) : 神器 logging，你真的了解吗？
 - [split-video](https://github.com/JustDoPython/python-examples/tree/master/taiyangxue/split-video) : 神器 ffmpeg —— 实现短视频批量化操作
 - [pypandoc](https://github.com/JustDoPython/python-examples/tree/master/taiyangxue/pypandoc) : 神器 Pypandoc —— 实现电子书自由

taiyangxue/fake-thread/main.py

@@ -0,0 +1,51 @@
+import time
+from concurrent.futures import ThreadPoolExecutor, ProcessPoolExecutor
+
+def gcd(pair):
+    '''
+    求解最大公约数
+    '''
+    a, b = pair
+    low = min(a, b)
+    for i in range(low, 0, -1):
+        if a % i == 0 and b % i == 0:
+            return i
+    
+    assert False, "Not reachable"
+
+# 待求解的数据
+NUMBERS = [
+    (1963309, 2265973), (5948475, 2734765),
+    (1876435, 4765849), (7654637, 3458496),
+    (1823712, 1924928), (2387454, 5873948),
+    (1239876, 2987473), (3487248, 2098437),
+    (1963309, 2265973), (5948475, 2734765),
+    (1876435, 4765849), (7654637, 3458496),
+    (1823712, 1924928), (2387454, 5873948),
+    (1239876, 2987473), (3487248, 2098437),
+    (3498747, 4563758), (1298737, 2129874)
+]
+
+if __name__ == '__main__':
+    ## 顺序求解
+    start = time.time()
+    results = list(map(gcd, NUMBERS))
+    end = time.time()
+    delta = end - start
+    print(f'顺序执行时间: {delta:.3f} 秒')
+
+    ## 多线程求解
+    start = time.time()
+    pool1 = ThreadPoolExecutor(max_workers=4)
+    results = list(pool1.map(gcd, NUMBERS))
+    end = time.time()
+    delta = end - start
+    print(f'并发执行时间: {delta:.3f} 秒')
+    
+    ## 并行求解
+    start = time.time()
+    pool2 = ProcessPoolExecutor(max_workers=4)
+    results = list(pool2.map(gcd, NUMBERS))
+    end = time.time()
+    delta = end - start
+    print(f'并行执行时间: {delta:.3f} 秒')