一、簡介
D:\>pip install freegames -i https://pypi.tuna.tsinghua.edu.cn/simple/
Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple/
Collecting freegames
Downloading https://pypi.tuna.tsinghua.edu.cn/packages/62/f5/643ebe95085f1fea2
d8e4597259d8c56a920df1ed10dcfb65d7b80caff4f/freegames-2.4.0-py3-none-any.whl (10
8 kB)
------------------------------------ 109.0/109.0 kB 528.1 kB/s eta 0:00:00
Installing collected packages: freegames
Successfully installed freegames-2.4.0DESCRIPTION
Free Python Games is an Apache2 licensed collection of free Python games
intended for education and fun. The games are written in simple Python code and
designed for experimentation and changes. Simplified versions of several
classic arcade games are included.
Python is one of the top-five most popular programming languages in the world
and available for free from www.python.org. Python includes an extensive
Standard Library distributed with your installation. The Standard Library has a
module called Turtle which is a popular way to introduce programming to
kids. Turtle was part of the original Logo programming language developed by
Wally Feurzig and Seymour Papert in 1966. All of the games in Free Python Games
are implemented using Python and its Turtle module.
Starting in 2012, Free Python Games began as an after school program to teach
programming to inner-city youth. The goal was to have fun as much as it was to
learn. Since then the games have been improved and used in a variety of
settings ranging from classrooms to summer day-camps.
The games run anywhere Python can be installed which includes desktop computers
running Windows, Mac OS, or Linux and older or low-power hardware such as the
Raspberry Pi. Kids across the United States in grades 6th-12th have enjoyed
learning about topics such as encryption and projectile motion through games.
Each game is entirely independent from the others and includes comments along
with a list of exercises to work through with students. Creativity and
flexibility is important. There is no right or wrong way to implement a new
feature or behavior! You never know which games students will engage with best.
Free Python Games supports a command-line interface (CLI). Help for the CLI is
available using::
$ python3 -m freegames --help
The CLI supports three commands: list, copy, and show. For a list of all games
run::
$ python3 -m freegames list
Any of the listed games may be played by executing the Python module from the
command-line. To reference the Python module, combine "freegames" with the name
of the game. For example, to play the "snake" game run::
$ python3 -m freegames.snake
Games can be modified by copying their source code. The copy command will
create a Python file in your local directory which you can edit. For example,
to copy and play the "snake" game run::
$ python3 -m freegames copy snake
$ python3 snake.py
Python includes a built-in text editor named IDLE which can also execute Python
code. To launch the editor and make changes to the "snake" game run::
$ python3 -m idlelib.idle snake.py
D:\>python -m freegames list
ant
bagels
bounce
cannon
connect
crypto
fidget
flappy
guess
life
madlibs
maze
memory
minesweeper
pacman
paint
pong
simonsays
snake
tictactoe
tiles
tron二、游戲
執行方法 freegames.游戲名
python -m freegames.life
python -m freegames.pacman
python -m freegames.cannon
python -m freegames.pong
python -m freegames.tiles
python -m freegames.maze
三、代碼學習
所謂“零代碼”實際上只是作者幫你寫好來，拿來就用或者參考學習而已。
執行： python -m freegames copy maze，就能拷貝出源碼來
(Windows系統)執行後，在當前用戶的文件夾下保存有源文件： maze.py
源代碼：很明顯游戲是基於turtle庫的代碼
"""Maze, move from one side to another.
Excercises
1. Keep score by counting taps.
2. Make the maze harder.
3. Generate the same maze twice.
"""
from random import random
from turtle import *
from freegames import line
def draw():
"""Draw maze."""
color('black')
width(5)
for x in range(-200, 200, 40):
for y in range(-200, 200, 40):
if random() > 0.5:
line(x, y, x + 40, y + 40)
else:
line(x, y + 40, x + 40, y)
update()
def tap(x, y):
"""Draw line and dot for screen tap."""
if abs(x) > 198 or abs(y) > 198:
up()
else:
down()
width(2)
color('red')
goto(x, y)
dot(4)
setup(420, 420, 370, 0)
hideturtle()
tracer(False)
draw()
onscreenclick(tap)
done()
再來看一個稍微復雜點的“貪吃蛇”代碼：
"""Snake, classic arcade game.
Exercises
1. How do you make the snake faster or slower?
2. How can you make the snake go around the edges?
3. How would you move the food?
4. Change the snake to respond to mouse clicks.
"""
from random import randrange
from turtle import *
from freegames import square, vector
food = vector(0, 0)
snake = [vector(10, 0)]
aim = vector(0, -10)
def change(x, y):
"""Change snake direction."""
aim.x = x
aim.y = y
def inside(head):
"""Return True if head inside boundaries."""
return -200 < head.x < 190 and -200 < head.y < 190
def move():
"""Move snake forward one segment."""
head = snake[-1].copy()
head.move(aim)
if not inside(head) or head in snake:
square(head.x, head.y, 9, 'red')
update()
return
snake.append(head)
if head == food:
print('Snake:', len(snake))
food.x = randrange(-15, 15) * 10
food.y = randrange(-15, 15) * 10
else:
snake.pop(0)
clear()
for body in snake:
square(body.x, body.y, 9, 'black')
square(food.x, food.y, 9, 'green')
update()
ontimer(move, 100)
setup(420, 420, 370, 0)
hideturtle()
tracer(False)
listen()
onkey(lambda: change(10, 0), 'Right')
onkey(lambda: change(-10, 0), 'Left')
onkey(lambda: change(0, 10), 'Up')
onkey(lambda: change(0, -10), 'Down')
move()
done()
四、內置類和函數
snake游戲中使用了內置的類vector及函數square
>>> from freegames import square, vector
除了這2個庫裡還有其它3個：
>>> import freegames
>>> freegames.__all__
['floor', 'line', 'path', 'square', 'vector']
使用簡介：
CLASSES
collections.abc.Sequence(collections.abc.Reversible, collections.abc.Collection)
freegames.utils.vector
class vector(collections.abc.Sequence)
| vector(x, y)
|
| Two-dimensional vector.
|
| Vectors can be modified in-place.
|
| >>> v = vector(0, 1)
| >>> v.move(1)
| >>> v
| vector(1, 2)
| >>> v.rotate(90)
| >>> v
| vector(-2.0, 1.0)
|
| Method resolution order:
| vector
| collections.abc.Sequence
| collections.abc.Reversible
| collections.abc.Collection
| collections.abc.Sized
| collections.abc.Iterable
| collections.abc.Container
| builtins.object
|
| Methods defined here:
|
| __abs__(self)
| v.__abs__() -> abs(v)
|
| >>> v = vector(3, 4)
| >>> abs(v)
| 5.0
|
| __add__(self, other)
| v.__add__(w) -> v + w
|
| >>> v = vector(1, 2)
| >>> w = vector(3, 4)
| >>> v + w
| vector(4, 6)
| >>> v + 1
| vector(2, 3)
| >>> 2.0 + v
| vector(3.0, 4.0)
|
| __eq__(self, other)
| v.__eq__(w) -> v == w
|
| >>> v = vector(1, 2)
| >>> w = vector(1, 2)
| >>> v == w
| True
|
| __getitem__(self, index)
| v.__getitem__(v, i) -> v[i]
|
| >>> v = vector(3, 4)
| >>> v[0]
| 3
| >>> v[1]
| 4
| >>> v[2]
| Traceback (most recent call last):
| ...
| IndexError
|
| __hash__(self)
| v.__hash__() -> hash(v)
|
| >>> v = vector(1, 2)
| >>> h = hash(v)
| >>> v.x = 2
| Traceback (most recent call last):
| ...
| ValueError: cannot set x after hashing
|
| __iadd__(self, other)
| v.__iadd__(w) -> v += w
|
| >>> v = vector(1, 2)
| >>> w = vector(3, 4)
| >>> v += w
| >>> v
| vector(4, 6)
| >>> v += 1
| >>> v
| vector(5, 7)
|
| __imul__(self, other)
| v.__imul__(w) -> v *= w
|
| >>> v = vector(1, 2)
| >>> w = vector(3, 4)
| >>> v *= w
| >>> v
| vector(3, 8)
| >>> v *= 2
| >>> v
| vector(6, 16)
|
| __init__(self, x, y)
| Initialize vector with coordinates: x, y.
|
| >>> v = vector(1, 2)
| >>> v.x
| 1
| >>> v.y
| 2
|
| __isub__(self, other)
| v.__isub__(w) -> v -= w
|
| >>> v = vector(1, 2)
| >>> w = vector(3, 4)
| >>> v -= w
| >>> v
| vector(-2, -2)
| >>> v -= 1
| >>> v
| vector(-3, -3)
|
| __itruediv__(self, other)
| v.__itruediv__(w) -> v /= w
|
| >>> v = vector(2, 4)
| >>> w = vector(4, 8)
| >>> v /= w
| >>> v
| vector(0.5, 0.5)
| >>> v /= 2
| >>> v
| vector(0.25, 0.25)
|
| __len__(self)
| v.__len__() -> len(v)
|
| >>> v = vector(1, 2)
| >>> len(v)
| 2
|
| __mul__(self, other)
| v.__mul__(w) -> v * w
|
| >>> v = vector(1, 2)
| >>> w = vector(3, 4)
| >>> v * w
| vector(3, 8)
| >>> v * 2
| vector(2, 4)
| >>> 3.0 * v
| vector(3.0, 6.0)
|
| __ne__(self, other)
| v.__ne__(w) -> v != w
|
| >>> v = vector(1, 2)
| >>> w = vector(3, 4)
| >>> v != w
| True
|
| __neg__(self)
| v.__neg__() -> -v
|
| >>> v = vector(1, 2)
| >>> -v
| vector(-1, -2)
|
| __radd__ = __add__(self, other)
|
| __repr__(self)
| v.__repr__() -> repr(v)
|
| >>> v = vector(1, 2)
| >>> repr(v)
| 'vector(1, 2)'
|
| __rmul__ = __mul__(self, other)
|
| __sub__(self, other)
| v.__sub__(w) -> v - w
|
| >>> v = vector(1, 2)
| >>> w = vector(3, 4)
| >>> v - w
| vector(-2, -2)
| >>> v - 1
| vector(0, 1)
|
| __truediv__(self, other)
| v.__truediv__(w) -> v / w
|
| >>> v = vector(1, 2)
| >>> w = vector(3, 4)
| >>> w / v
| vector(3.0, 2.0)
| >>> v / 2
| vector(0.5, 1.0)
|
| copy(self)
| Return copy of vector.
|
| >>> v = vector(1, 2)
| >>> w = v.copy()
| >>> v is w
| False
|
| move(self, other)
| Move vector by other (in-place).
|
| >>> v = vector(1, 2)
| >>> w = vector(3, 4)
| >>> v.move(w)
| >>> v
| vector(4, 6)
| >>> v.move(3)
| >>> v
| vector(7, 9)
|
| rotate(self, angle)
| Rotate vector counter-clockwise by angle (in-place).
|
| >>> v = vector(1, 2)
| >>> v.rotate(90)
| >>> v == vector(-2, 1)
| True
|
| scale(self, other)
| Scale vector by other (in-place).
|
| >>> v = vector(1, 2)
| >>> w = vector(3, 4)
| >>> v.scale(w)
| >>> v
| vector(3, 8)
| >>> v.scale(0.5)
| >>> v
| vector(1.5, 4.0)
|
| ----------------------------------------------------------------------
| Data descriptors defined here:
|
| x
| X-axis component of vector.
|
| >>> v = vector(1, 2)
| >>> v.x
| 1
| >>> v.x = 3
| >>> v.x
| 3
|
| y
| Y-axis component of vector.
|
| >>> v = vector(1, 2)
| >>> v.y
| 2
| >>> v.y = 5
| >>> v.y
| 5
|
| ----------------------------------------------------------------------
| Data and other attributes defined here:
|
| PRECISION = 6
|
| __abstractmethods__ = frozenset()
|
| ----------------------------------------------------------------------
| Methods inherited from collections.abc.Sequence:
|
| __contains__(self, value)
|
| __iter__(self)
|
| __reversed__(self)
|
| count(self, value)
| S.count(value) -> integer -- return number of occurrences of value
|
| index(self, value, start=0, stop=None)
| S.index(value, [start, [stop]]) -> integer -- return first index of value.
| Raises ValueError if the value is not present.
|
| Supporting start and stop arguments is optional, but
| recommended.
|
| ----------------------------------------------------------------------
| Class methods inherited from collections.abc.Reversible:
|
| __subclasshook__(C) from abc.ABCMeta
| Abstract classes can override this to customize issubclass().
|
| This is invoked early on by abc.ABCMeta.__subclasscheck__().
| It should return True, False or NotImplemented. If it returns
| NotImplemented, the normal algorithm is used. Otherwise, it
| overrides the normal algorithm (and the outcome is cached).
FUNCTIONS
floor(value, size, offset=200)
Floor of `value` given `size` and `offset`.
The floor function is best understood with a diagram of the number line::
-200 -100 0 100 200
<--|--x--|-----|--y--|--z--|-->
The number line shown has offset 200 denoted by the left-hand tick mark at
-200 and size 100 denoted by the tick marks at -100, 0, 100, and 200. The
floor of a value is the left-hand tick mark of the range where it lies. So
for the points show above: ``floor(x)`` is -200, ``floor(y)`` is 0, and
``floor(z)`` is 100.
>>> floor(10, 100)
0.0
>>> floor(120, 100)
100.0
>>> floor(-10, 100)
-100.0
>>> floor(-150, 100)
-200.0
>>> floor(50, 167)
-33.0
line(a, b, x, y)
Draw line from `(a, b)` to `(x, y)`.
path(filename)
Return full path to `filename` in freegames module.
square(x, y, size, name)
Draw square at `(x, y)` with side length `size` and fill color `name`.
The square is oriented so the bottom left corner is at (x, y).另外還有20段代碼，你可以用命令自己copy出來一一學習。總體來說，代碼難度不是很高，重要的是要自己動手模仿編出新的游戲來！
