Added example answers for chapters 13 and 14 to fix #1

CH_14_multithreading_and_multiprocessing/exercise_03/multiprocessing_solution_00.py

@@ -0,0 +1,35 @@
+# Read all files in a directory and sum the size of the files by
+# reading each file using `multiprocessing`
+
+import logging
+import multiprocessing
+import pathlib
+
+# Directory to process
+PATH = pathlib.Path(__file__).parent.parent
+
+# We need to setup the logging outside of the
+# `if __name__ == '__main__'` block because the
+# `multiprocessing` module will not execute that section.
+logging.basicConfig(level=logging.INFO)
+
+
+def get_size(path: pathlib.Path):
+    size = path.stat().st_size
+    logging.info(
+        '%s is %d bytes',
+        path.relative_to(PATH),
+        size,
+    )
+    return size
+
+
+def main(path: pathlib.Path):
+    with multiprocessing.Pool() as pool:
+        total_size = sum(pool.map(get_size, path.iterdir()))
+
+        print(f'Total size for {path} is: {total_size}')
+
+
+if __name__ == '__main__':
+    main(PATH)

CH_14_multithreading_and_multiprocessing/exercise_03/threading_solution_00.py

@@ -0,0 +1,45 @@
+# Read all files in a directory and sum the size of the files by
+# reading each file using `threading`
+
+import logging
+import pathlib
+import threading
+
+# Directory to process
+PATH = pathlib.Path(__file__).parent.parent
+
+
+class FileSizeThread(threading.Thread):
+
+    def __init__(self, path: pathlib.Path):
+        super().__init__()
+        self.path = path
+        self.size = 0
+
+    def run(self):
+        self.size = self.path.stat().st_size
+        logging.info(
+            '%s is %d bytes',
+            self.path.relative_to(PATH),
+            self.size,
+        )
+
+
+def main(path: pathlib.Path):
+    threads = []
+    for child in path.iterdir():
+        thread = FileSizeThread(child)
+        thread.start()
+        threads.append(thread)
+
+    total_size = 0
+    for thread in threads:
+        thread.join()
+        total_size += thread.size
+
+    print(f'Total size for {path} is: {total_size}')
+
+
+if __name__ == '__main__':
+    logging.basicConfig(level=logging.INFO)
+    main(PATH)