ch08, 09, 10: example files

09-closure-deco/clockdeco_cls.py

@@ -0,0 +1,44 @@
+# clockdeco_class.py
+
+"""
+>>> snooze(.1)  # doctest: +ELLIPSIS
+[0.101...s] snooze(0.1) -> None
+>>> clock('{name}: {elapsed}')(time.sleep)(.2)  # doctest: +ELLIPSIS
+sleep: 0.20...
+>>> clock('{name}({args}) dt={elapsed:0.3f}s')(time.sleep)(.2)
+sleep(0.2) dt=0.201s
+"""
+
+# tag::CLOCKDECO_CLS[]
+import time
+
+DEFAULT_FMT = '[{elapsed:0.8f}s] {name}({args}) -> {result}'
+
+class clock:  # <1>
+
+    def __init__(self, fmt=DEFAULT_FMT):  # <2>
+        self.fmt = fmt
+
+    def __call__(self, func):  # <3>
+        def clocked(*_args):
+            t0 = time.perf_counter()
+            _result = func(*_args)  # <4>
+            elapsed = time.perf_counter() - t0
+            name = func.__name__
+            args = ', '.join(repr(arg) for arg in _args)
+            result = repr(_result)
+            print(self.fmt.format(**locals()))
+            return _result
+        return clocked
+# end::CLOCKDECO_CLS[]
+
+if __name__ == '__main__':
+
+    @clock()
+    def snooze(seconds):
+        time.sleep(seconds)
+
+    for i in range(3):
+        snooze(.123)
+
+