Chapter folders renamed

Chapter06/decorator/decorator0-extra.py

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+# decorator1.py
+
+def add_hello(myfunc):
+    def _add_hello():
+        print("inside add hello")
+        myfunc()
+    return _add_hello
+
+@add_hello
+def hello_world():
+    print("hello world")
+
+hello_world()

Chapter06/decorator/decorator1.py

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+# decorator1.py
+from datetime import datetime
+
+def add_timestamps(myfunc):
+    def _add_timestamps():
+        print(datetime.now())
+        myfunc()
+        print(datetime.now())
+    return _add_timestamps
+
+@add_timestamps
+def hello_world():
+    print("hello world")
+
+hello_world()
+
+#hello = add_timestamps(hello_world)
+#hello()

Chapter06/decorator/decorator2.py

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+# decorator2.py
+from datetime import datetime
+from functools import wraps
+
+def add_timestamps(myfunc):
+    @wraps(myfunc)
+    def _add_timestamps():
+        print(datetime.now())
+        myfunc()
+        print(datetime.now())
+    return _add_timestamps
+
+@add_timestamps
+def hello_world():
+    print("hello world")
+
+hello_world()
+help(hello_world)
+print(hello_world)

Chapter06/decorator/decorator3.py

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+# decorator3.py
+from functools import wraps
+
+def power(func):
+    @wraps(func)
+    def inner_calc(*args, **kwargs):
+        print("Decorating power")
+        n = func(*args, **kwargs)
+        return n
+    return inner_calc
+
+@power
+def power_base2(n):
+    return 2**n
+
+print(power_base2(3))

Chapter06/decorator/decorator4.py

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+# decorator4.py
+from functools import wraps
+
+def power_calc(base):
+    def inner_decorator(func):
+        @wraps(func)
+        def inner_calc(*args, **kwargs):
+            exponent = func(*args, **kwargs)
+            return base**exponent
+        return inner_calc
+    return inner_decorator
+
+@power_calc(base=3)
+def power_n(n):
+    return n
+
+print(power_n(2))
+print(power_n(4))

Chapter06/decorator/decorator5.py

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+# decorator5.py
+from datetime import datetime
+from functools import wraps
+
+def add_timestamp(func):
+    @wraps(func)
+    def inner_func(*args, **kwargs):
+        res = "{}: {}\n".format(datetime.now(), func(*args, **kwargs))
+        return res
+    return inner_func
+
+def file(func):
+    @wraps(func)
+    def inner_func(*args, **kwargs):
+        res = func(*args, **kwargs)
+        with open("log.txt", 'a') as file:
+            file.write(res)
+        return res
+    return inner_func
+
+def console(func):
+    @wraps(func)
+    def inner_func(*args, **kwargs):
+        res = func(*args, **kwargs)
+        print(res)
+        return res
+    return inner_func
+
+@file
+@add_timestamp
+def log(msg):
+    return msg
+
+@file
+@console
+@add_timestamp
+def log1(msg):
+    return msg
+
+@console
+@add_timestamp
+def log2(msg):
+    return msg
+
+log("This is a test message for file only")
+log1("This is a test message for both file and console")
+log2("This message is for console only")

Chapter06/decorator/decorator6-extra.py

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+from functools import wraps
+
+def makebold(fn):
+    @wraps(fn)
+    def wrapped(*args, **kwargs):
+        return "<b>" + fn(*args, **kwargs) + "</b>"
+    return wrapped
+
+def makeitalic(fn):
+    @wraps(fn)
+    def wrapped(*args, **kwargs):
+        return "<i>" + fn(*args, **kwargs) + "</i>"
+    return wrapped
+
+@makebold
+@makeitalic
+def say():
+    return 'Hello'
+
+print(say())

Chapter06/decorator/log.txt

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+2021-03-13 12:53:00.545882: This is a test message for both file and console
+2021-03-13 12:53:21.075098: This is a test message for file only
+2021-03-13 12:53:21.075517: This is a test message for both file and console