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balazs/python-the-hard-way/ex32/notes_n_drills.org
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balazs/python-the-hard-way/ex32/notes_n_drills.org
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* Drills
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** Take a look at how you used range . Look up the range function to understand it.
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tldr, a "function" that generates a sequence of numbers:
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class range(start, stop[, step]):
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start
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The value of the start parameter (or 0 if the parameter was not supplied)
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stop
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The value of the stop parameter
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step
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The value of the step parameter (or 1 if the parameter was not supplied)
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-------
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I found it among python 3.8.3 built-in functions.
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but!
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Turns out it's not a function after all!
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It's an immutable sequence type.
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"a range object will always take the same (small) amount of memory" ... "as it only stores the start, stop and step values" and generates numbers on the fly
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note: similar in shell is: seq
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source: https://docs.python.org/3/library/stdtypes.html#range
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** Could you have avoided that for-loop entirely on line 22 and just assigned range(0,6) directly to elements?
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Do you mean line 21 book? (typo)
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Yes! Because range will generate a list that can be appended added as is.
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** Find the Python documentation on lists and read about them. What other operations can you do to lists besides append?
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extend, insert, remove, pop, clear, index, count, sort, reverse, copy
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fascinating! programming is cool! you can do so much with it
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22
balazs/python-the-hard-way/ex33/ex33.py
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balazs/python-the-hard-way/ex33/ex33.py
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#i = 0
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numbers = []
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def counter(i2, INC_BY):
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i = 0
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while i < i2 :
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print(f"At the top i is {i}")
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numbers.append(i)
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i = i + INC_BY
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print("Nums now:", numbers)
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print(f"At the bottom i is {i}")
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print("The numbers: ")
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for num in numbers:
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print(num)
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counter(2, 2)
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6
balazs/python-the-hard-way/ex34/notes_n_drills.org
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balazs/python-the-hard-way/ex34/notes_n_drills.org
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* Drills
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** With what you know of the difference between these types of numbers, can you explain why the year 2010 in ”January 1, 2010,” really is 2010 and not 2009? (Hint: you can’t pick years at random.)
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What is this question? :/
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84
balazs/python-the-hard-way/ex35/ex35.py
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balazs/python-the-hard-way/ex35/ex35.py
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from sys import exit
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import time
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def gold_room():
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print("This room is full of gold. How much do you take?")
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choice = input("> ")
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if "0" in choice or "1" in choice:
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how_much = int(choice)
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else:
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dead("Man, learn to type a number.")
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if how_much < 50:
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print("Nice, you're not greedy, you win!")
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exit(0)
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else:
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dead("You greedy bastard!")
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def bear_room():
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print("There is bear here.")
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print("The bear has a bunch of honey.")
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print("The fat bear is in front of another door.")
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print("How are you going to move the bear?")
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bear_moved = False
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while True:
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choice = input("> ")
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if choice == "take honey":
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dead("The bear looks at you then slaps your face off.")
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elif choice == "taunt bear" and not bear_moved:
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print("The bear has moved from the door.")
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print("You can go through it now.")
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bear_moved = True
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elif choice == "tea" and not bear_moved:
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print("You have invited the bear for a tea.")
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time.sleep(1)
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print("The bear is happy and moved.")
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bear_moved = True
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elif choice == "taunt bear" and bear_moved:
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dead("The bear gets pissed off and chews your leg off.")
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elif choice == "open door" and bear_moved:
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gold_room()
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else:
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print("I got no idea what that means.")
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def cthulhu_room():
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print("Here you see the great evil Cthulhu.")
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print("He, it, whatever stares at you and you go insane.")
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print("Do you flee for your life or eat your head?")
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choice = input("> ")
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if "flee" in choice:
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start()
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elif "head" in choice:
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dead("Well that was tasty!")
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else:
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cthulhu_room()
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def dead(why):
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print(why, "Good job!")
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exit(0)
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def start():
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print("You are in a dark room.")
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print("There is a door to your right and left.")
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print("Which one do you take?")
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choice = input("> ")
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if choice == "left":
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bear_room()
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elif choice == "right":
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cthulhu_room()
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else:
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dead("You stumble around the room until you starve.")
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start()
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10
balazs/python-the-hard-way/ex35/notes_n_drills.org
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10
balazs/python-the-hard-way/ex35/notes_n_drills.org
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*Drills
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** The gold_room has a weird way of getting you to type a number. What are all the bugs in this way of doing it? Can you make it better than what I’ve written? Look at how int() works for clues.
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Non greedy is less than 50 but only 1 and 0 qualify.
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Nicer ways:
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-> check for numbers
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-> also check for None and All strings
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-> sanitize input for int(), (int can take 2 variables)
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