Make a game where a bunch of enemies are moving in random direction.
variable names are hers, and also the numbers for the movement
import pgzrun
import random
game_over=False
HEIGHT=800
king=Actor("c2")
king.y=300
WIDTH=800
HEIGHT=800
lon=[]
for i in range(10):
elf=Actor("c1")
elf.x=random.randint(10,790)
elf.y=random.randint(10,790)
lon.append(elf)
def update():
global game_over
if keyboard.W:
king.y-=5
if keyboard.S:
king.y+=5
if keyboard.A:
king.x-=5
if keyboard.D:
king.x+=5
for e in lon:
if king.colliderect(e):
game_over=True
e.x+=random.choice([-1,+1,2,+3,-9,4,5,+3,7,12])
e.y+=random.choice([+3,+3,+4,+4,+5,+7,+1,+2,+5,+13])
if e.y>800:
e.y=10
if e.x>800:
e.x=10
def draw():
screen.fill('black')
if game_over==True:
screen.fill('pink')
king.draw()
for e in lon:
e.draw()
pgzrun.go()
Make the previous game into jumpscare game, when enemy hits you show scary image and play scary soubd.
...
corgi = Actor("narutoz")
maxx=Actor("gaaras")
...
def draw():
...
if game_over==True:
screen.fill('pink')
scary = random.choice([corgi,maxx])
scary.draw()
sounds.retro.play()
...
Make one file util.py
import random
def sum(a,b,c):
return a + b + c
def choice(a,b):
if random.randint(0,1) == 1:
return a:
else:
return b
Now make another file in the same directory:
import util
x = util.choice(6,7)
y = util.choice(2,4)
z = util.choice(8,9)
s = util.sum(x,y,z)
print(s)
We have created a "module", which is just a bunch of code grouped together that we can access.
From now on we will keep growing our util module with handy functions that we can use in other programs.
Watch Python Tutorial: File Objects - Reading and Writing to Files, and also try it out in your editor.
The two most important concepts you have to learn are file and process, a file is a piece of data, could be text, could be machine code, could be an image, and a process is a running program.
At the moment you use google docs to write your school projects, and Steam or Epic to start your games, the Apple App Store or Microsoft Store to install Minecraft.. Everything is like magic, things somehow work if you press the right button and sometimes they dont work and nobody knows why. I have a different relationship with the computer, I dont use the mouse as much, and use commands to tell it what to do, from searching for files to editting them or saving them or copying them to another machine. If I need to do something I either make a program to do it or use a program that I already know, I join the output of one program into the input of another. I know which processees are running and how to stop them, which one takes more resources or is causing problems. And it has been like that since I started using computers. There is no magic, its just files and processees.
For the next weeks we will move to using the command line more and more. Using command line editors such as nano and commands such as mkdir, ls, grep and find to navigate make directories, list their contents, search for patterns in files and find specific files. Using date to see the current time and cal to see the calendar, cp to copy a file and mv to rename it or cat to show its contents.
It might seem like artificial change, from using graphical interfaces to terminal intefaces, but I think it is in the core of how you interact with the machine. How do you express your thoughts and tell it what to do.
Tomorrow we will skim through UNIX Programming Enviornment book from 1984, by the legends Brian W. Kernigan and Rob Pike.
Copy this program into a python file on your desktop, then run it
import os
import random
possible = ["a b c", "hello","world", "has space","maybe empty","empty","not empty"]
def md(p):
one_of_five = ''
for i in range(1,6):
a = random.choice(possible)
one_of_five= a
os.makedirs(os.path.join(p,a), exist_ok=True)
return one_of_five
p = os.path.join(".","secret mission")
for i in range(10):
p = os.path.join(p, md(p))
with open(os.path.join(p, "password.txt"), "w") as f:
f.write("the password is: " + str(random.randint(123123,477217972)* 31))
It will create a random tree of directories, and in one of them there will be a file named password.txt with a random password.
Use the command line to find the password, using the dir and cd commands (on macos/linux use ls and cd), use type password.txt on windows or cat password.txt on linux to see the contents of the file.
we were camping and had an old introduction to C book, and decided to skim through some of the code
int i;
for (i = 1; i < 10; i++) {
printf("%d\n",i)
}
a for loop in C has 3 parts separated by ; (semi-colon)
The first part i = 1 is the initialization part, it will be executed only once.
You can also write the above loop like this:
int i = 1;
for (; i < 10; i++) {
printf("%d\n",i)
}
The second part i < 10 is the condition, if the condition is true it will enter the loop and execute the block of code inside, otherwise it will continue with the code after the loop. If you dont put any condition in, it is always going to enter the loop turning it into infinite loop unless you break out of it. You can also write it like this:
for (i = 1; ; i++) {
if (i >= 10) {
break;
}
printf("%d\n",i)
}
The third part i++ or i+=1 is the increment part, it will be executed just after the code in the loop is finished and is about to go back to start, you can also write it like this:
for (i = 1; i < 10; ) {
printf("%d\n",i)
i++
}
You can see that each of the 3 parts are optional, you can write the same loop like this:
int i = 1;
for (;;) {
if (i >= 10) {
break;
}
printf("%d\n",i)
i++
}
So you see having the 3 parts, init; condition; increment together with the for keyword makes it read nicer.