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Chapter 3
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‎Ch3/augmented_assignment_operators.py‎

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foo = 10
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foo += 10 # value is now 20 (10 + 10)
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foo -= 5 # value is now 15 (20 - 5)
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foo *= 16 # value is now 240 (15 * 16)
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foo //= 5 # value is now 48 (240 // 5)
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foo /= 4 # value is now 144.0 (48 / 4)
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foo **= 2 # value is now 144.0 (12.0 ** 2)
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foo %= 51 # value is now 42.0 (144.0 % 15)

‎Ch3/bitwise_operations.py‎

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print(9 & 8) # bitwise AND, yields 8
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print(9 | 8) # bitwise OR, yields 9
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print(9 ^ 8) # bitwise XOR, yields 1
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print(~8) # unary bitwise ones complement (flip), yields -9
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print(1 << 3) # bitwise left shift, yields 8
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print(8 >> 3) # bitwise right shift, yields 1

‎Ch3/boolean_identity_operators.py‎

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spam = True
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eggs = False
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potatoes = None
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if spam is True: # Evaluates to True
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print("We have spam.")
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if spam is not False: # Evaluates to True
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print("I DON'T LIKE SPAM!")
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if spam: # Implicitly evaluates to True (preferred)
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print("Spam, spam, spam, spam...")
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if eggs is False: # Evaluates to True
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print("We're all out of eggs.")
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if eggs is not True: # Evaluates to True
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print("No eggs, but we have spam, spam, spam, spam...")
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if not eggs: # Implicitly evaluates to True (preferred)
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print("Would you like spam instead?")
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if potatoes is not None: # Evaluates to False (preferred)
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print("Yum") # We never reach this...potatoes is None!
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if potatoes is None: # Evaluates to True (preferred)
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print("Yes, we have no potatoes.")
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if eggs is spam: # Evaluates to False (CAUTION!!!)
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print("This won't work.")

‎Ch3/cheese_list.py‎

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cheeses = ["Red Leicester", "Tilsit", "Caerphilly", "Bel Paese"]
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print(cheeses[1]) # prints "Tilsit"
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cheeses[1] = "Cheddar"
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print(cheeses[1]) # prints "Cheddar"

‎Ch3/cheese_shop.py‎

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in_stock = 0
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# print("This cheese shop has " + str(in_stock) + " types of cheese.")
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print(f"This cheese shop has {in_stock} types of cheese.")

‎Ch3/comments.py‎

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# This is a comment
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print("Hello, world!")
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print("How are you?") # This is an inline comment
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# Here's another comment
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# And another
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# And...you get the idea

‎Ch3/comparison_operators.py‎

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score =98
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high_score = 100
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print(score == high_score) # equals, evaluates to False
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print(score != high_score) # not equals, evalutes to True
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print(score < high_score) # less than, evaluates to True
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print(score <= high_score) # less than or equals, evalutes to True
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print(score > high_score) # greater than, evaluates to False
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print(score >= high_score) # greater than or equals, evaluates to False

‎Ch3/concat_strings.py‎

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greeting = "Hello"
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name = "Jason"
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# message = greeting + ", " + name + "!" # value is "Hello, Jason!"
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message = "".join((greeting, ", ", name, "!")) # value is "Hello, Jason!"
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print(message)

‎Ch3/conditional_greet.py‎

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command = "greet"
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if command == "greet":
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print("Hello!")
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elif command == "exit":
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print("Goodbye")
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else:
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print("I don't understand.")

‎Ch3/docstrings.py‎

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def make_tea():
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"""Will produce a concoction almost,
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but not entirely unlike tea."""
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# ... function logic ...
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#print(make_tea.__doc__)
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help(make_tea)

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