Python Game Programming Tutorial: Space Invaders 4

Time to kill some enemies - learn how to create the player's weapon in this video.

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#Python #Tutorial #Beginner

[wyattcaldwell]

when you realize he spelled heading wrong before he realizes
so the student becomes the master

[phb]

I found out that the reason why the bullet gets stuck sometimes is because the flag bulletstate gets set to "fire" in the function "fire_bullet" however, even though it is set as a global variable, in the loop it remains with the "readdy" value, that's why it shows up but it doesn't move.
The way I fixed it was: instead of using a flag to track the state, the code checks if the bullet is visible using the method "isvisible()", so:

# this goes in the fire_bullet function
if not bullet.isvisible():
x = player.xcor()
y = player.ycor() + 10
bullet.setposition(x, y)
bullet.showturtle()

# this goes inside the loop
if bullet.isvisible():
y = bullet.ycor() + bulletspeed
bullet.sety(y)

[AkinJanet]

l realy seen less than 3 people who is realy know what he teachs and how to teach in a clean and confort way, Christian you are in that 3, thanx

[jestry]

Hello @TokyoEdTech, i'm obviously on episode 4 and just wanted to give some feedback. A month ago I bought a book for Python because I've always wanted to know how programming actually works. I'm about halfway through the book and thought to myself: It's a shame that the book doesn't develop a game. So I looked on YOutube and found your great series of videos. I find them super entertaining and instructive, thank you very much. ^^

[janminator]

Omg it finnaly works the bullet doesn't reset anymore yay. I didn't have the player cor in the if statement It was outside of it. I was looking for so many ways to try and fix it but pressing space a few times done the job.

[Jack-xnoh]

This tutorial is one of the best I have found that help when trying to learn turtle as it is all explained <3.


Only problem I had is one of my 'ycor' lines had an 'x' instead of a 'y' and it took me about 40 mins to find it :3 :'(

[sedwars]

I like the fact you try your best to reply to every comment

[imperial_gunner_]

After I saw this video I started coding so thanks so much for that! Keep up the good work!

[bbz]

A lot of comments associated with syntax errors. If, you at the beginner level try use any modern IDE like:
etc.


Be attention to syntax highlight.


P.S. - Author did great job, with simple coding and step by step explanation

[mahendrank]

i've never seen a tutorial like this
plz keep it on

[dispatchOS]

Awesome tutorial for python beginners, highly recommend!

[bearz_ftw]

You make really good videos. Thank you for teaching

[raves_r]

Hi thank you very much for the video! Im just wondering how do I limit the ammo of the weapon?

[teacherinthailan]

I've made it this far!! My biggest problem being typos. I think I need a better IDE. Great tutorial once again. Thanks.

[WhaleInTheSkies]

When I fire the bullet:
1) enemy goes slower
2) once in 2 times it's stuck on top of the player (it happens on your video as well)
Can't solve it
Can you help, please?

I'm enjoying your tutorials btw. Thank you!

[ItsMeDante]

Everything is fine, i'm so happy to see what i have to do next to make this game rock .Thx btw

[KevHeero]

Love your vids I love trying to figure out coding

[Shyam_NZ]

Hey, so I just finished the video and the bullet just doesn't spawn, is there a fix for this? here are my codes for it -
#Create the player bullet
bullet = turtle.Turtle()
bullet.color("white")
bullet.shape("circle")
bullet.penup()
bullet.speed(0)
bullet.setheading(90)
bullet.shapesize(0.5, 0.5)
bullet.hideturtle()

bulletspeed = 20

#Define bullet state
#Ready- ready to fire
#Fire - bullet is firing
bulletstate = "ready"

and-
def fire_bullet():
#Declare bulletstate as a global if it needs changed
global bulletstate

#Move the bullet to just above the player
x = player.xcor()
y = player.ycor()
bullet.setposition(x, y + 10)
bullet.showturtle()




#create keyboard bindings
turtle.listen()
turtle.onkey(move_left, "Left")
turtle.onkey(move_right, "Right")
turtle.onkey(fire_bullet, "space")

and -

#Move the bullet
y = bullet.ycor()
y += bulletspeed
bullet.sety(y)

plz help . Also, nothing has changed, i just watched the collision video, and nothing is changing, I changed the enemy position and yet nothing has happened. Even if I change enemy speed, it still stays the same and nothing is customized/ So pretty much from part 4, nothing has happened to my project.

[clarencesmith]

Hi, I've been a python programmer for a while, but so far did only write console applications. I was very happy to discover that there's an easy way to draw to the screen in python. Your tutorials are great! But I really don't want to use globals. Isn't there a way to make the fire_bullet function return the bulletstate somehow?

[RotieGaming]

7:05 never mind just a reminder where i am in the video :)