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day-54-intro-to-flask/hello.py

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+from flask import Flask
+
+app = Flask(__name__)
+
+
+@app.route('/')
+def hello_world():
+    return 'Hello, World!'
+
+
+if __name__ == "__main__":
+    app.run()
+

day-54-intro-to-flask/main.py

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+# ----------- Python Functions as First Class Objects: Passing & Nesting Functions -------------- #
+
+# Functions can have inputs/functionality/output
+def add(n1, n2):
+    return n1 + n2
+
+def subtract(n1, n2):
+    return n1 - n2
+
+def multiply(n1, n2):
+    return n1 * n2
+
+def divide(n1, n2):
+    return n1 / n2
+
+# Functions are first-class objects, can be passed around as arguments e.g. int/string/float etc.
+
+def calculate(calc_function, n1, n2):
+    return calc_function(n1, n2)
+
+result = calculate(add, 2, 3)
+print(result)
+
+# Functions can be nested in other functions
+
+def outer_function():
+    print("I'm outer")
+
+    def nested_function():
+        print("I'm inner")
+
+    nested_function()
+
+outer_function()
+
+# Functions can be returned from other functions
+def outer_function():
+    print("I'm outer")
+
+    def nested_function():
+        print("I'm inner")
+
+    return nested_function
+
+inner_function = outer_function()
+inner_function
+
+
+# Simple Python Decorator Functions
+import time
+
+def delay_decorator(function):
+    def wrapper_function():
+        time.sleep(2)
+        #Do something before
+        function()
+        function()
+        #Do something after
+    return wrapper_function
+
+@delay_decorator
+def say_hello():
+    print("Hello")
+
+# With the @ syntactic sugar
+@delay_decorator
+def say_bye():
+    print("Bye")
+
+# Without the @ syntactic sugar
+def say_greeting():
+    print("How are you?")
+decorated_function = delay_decorator(say_greeting)
+decorated_function()