initial creation

py3interm/EXAMPLES/thr_locking.py

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+#!/usr/bin/env python
+import threading  # <1>
+import random
+import time
+
+WORDS = 'apple banana mango peach papaya cherry lemon watermelon fig elderberry'.split()
+
+MAX_SLEEP_TIME = 3
+WORD_LIST = []  # <2>
+WORD_LIST_LOCK = threading.Lock()  # <3>
+STDOUT_LOCK = threading.Lock()  # <3>
+
+class SimpleThread(threading.Thread):
+    def __init__(self, num, word):  # <4>
+        super().__init__()  # <5>
+        self._word = word
+        self._num = num
+
+    def run(self):  # <6>
+        time.sleep(random.randint(1, MAX_SLEEP_TIME))
+        with STDOUT_LOCK:  # <7>
+            print("Hello from thread {} ({})".format(self._num, self._word))
+
+        with WORD_LIST_LOCK:  # <7>
+            WORD_LIST.append(self._word.upper())
+
+all_threads = []  # <8>
+for i, random_word in enumerate(WORDS, 1):
+    t = SimpleThread(i, random_word)  # <9>
+    all_threads.append(t)  # <10>
+    t.start()  # <11>
+
+print("All threads launched...")
+
+for t in all_threads:
+    t.join()  # <12>
+
+print(WORD_LIST)