Develop Reference

python pygame code how to handle and control animation in for loop correctly? [duplicate]

This simple piece of code crashes (the window is not responding) after a few seconds (around 5).
import pygame
from pygame.locals import *
pygame.init()
screen = pygame.display.set_mode((640, 480), 0, 24)
#clock = pygame.time.Clock()
#font = pygame.font.Font(None, 32)
cycles = 0
while True:
screen.fill(0)
# text = font.render('Cycles : %d' % cycles, True, (255, 255, 255))
# screen.blit(text, (100, 100))
cycles += 1
pygame.display.update()
If I uncomment the commented lines, I can clearly see the program going out of control when displaying values between 47 and 50.
I use python 2.7 and pygame 1.9.2, Windows 8 (64 bits) and Eclipse + PyDev.

Call pygame.event.get() at the beginning of the while loop.

You need to regularly make a call to one of four functions in the pygame.event module in order for pygame to internally interact with your OS. Otherwise the OS will think your game has crashed. So make sure you call one of these:
pygame.event.get() returns a list of all events currently in the event queue.
pygame.event.poll() returns a single event from the event queue or pygame.NOEVENT if the queue is empty.
pygame.event.wait() returns a single event from the event queue or waits until an event can be returned.
pygame.event.pump() allows pygame to handle internal actions. Useful when you don't want to handle events from the event queue.

The window does not respond (freeze), because you do not handle the events. You have to handle the events by either pygame.event.pump() or pygame.event.get(), to keep the window responding.
See the documentation of pygame.event.pump():
For each frame of your game, you will need to make some sort of call to the event queue. This ensures your program can internally interact with the rest of the operating system.
Add an event loop, for instance:
run = True
while run:
for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
# [...]
Alternatively just pump the events:
while True:
pygame.event.pump()
# [...]
Minimal example: repl.it/#Rabbid76/PyGame-MinimalApplicationLoop

Pygame function not returning values [duplicate]

This simple piece of code crashes (the window is not responding) after a few seconds (around 5).
import pygame
from pygame.locals import *
pygame.init()
screen = pygame.display.set_mode((640, 480), 0, 24)
#clock = pygame.time.Clock()
#font = pygame.font.Font(None, 32)
cycles = 0
while True:
screen.fill(0)
# text = font.render('Cycles : %d' % cycles, True, (255, 255, 255))
# screen.blit(text, (100, 100))
cycles += 1
pygame.display.update()
If I uncomment the commented lines, I can clearly see the program going out of control when displaying values between 47 and 50.
I use python 2.7 and pygame 1.9.2, Windows 8 (64 bits) and Eclipse + PyDev.

Call pygame.event.get() at the beginning of the while loop.

You need to regularly make a call to one of four functions in the pygame.event module in order for pygame to internally interact with your OS. Otherwise the OS will think your game has crashed. So make sure you call one of these:
pygame.event.get() returns a list of all events currently in the event queue.
pygame.event.poll() returns a single event from the event queue or pygame.NOEVENT if the queue is empty.
pygame.event.wait() returns a single event from the event queue or waits until an event can be returned.
pygame.event.pump() allows pygame to handle internal actions. Useful when you don't want to handle events from the event queue.

The window does not respond (freeze), because you do not handle the events. You have to handle the events by either pygame.event.pump() or pygame.event.get(), to keep the window responding.
See the documentation of pygame.event.pump():
For each frame of your game, you will need to make some sort of call to the event queue. This ensures your program can internally interact with the rest of the operating system.
Add an event loop, for instance:
run = True
while run:
for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
# [...]
Alternatively just pump the events:
while True:
pygame.event.pump()
# [...]
Minimal example: repl.it/#Rabbid76/PyGame-MinimalApplicationLoop

Pygame stops responding when I click to show the window, how can I fix that? [duplicate]

This simple piece of code crashes (the window is not responding) after a few seconds (around 5).
import pygame
from pygame.locals import *
pygame.init()
screen = pygame.display.set_mode((640, 480), 0, 24)
#clock = pygame.time.Clock()
#font = pygame.font.Font(None, 32)
cycles = 0
while True:
screen.fill(0)
# text = font.render('Cycles : %d' % cycles, True, (255, 255, 255))
# screen.blit(text, (100, 100))
cycles += 1
pygame.display.update()
If I uncomment the commented lines, I can clearly see the program going out of control when displaying values between 47 and 50.
I use python 2.7 and pygame 1.9.2, Windows 8 (64 bits) and Eclipse + PyDev.

Call pygame.event.get() at the beginning of the while loop.

You need to regularly make a call to one of four functions in the pygame.event module in order for pygame to internally interact with your OS. Otherwise the OS will think your game has crashed. So make sure you call one of these:
pygame.event.get() returns a list of all events currently in the event queue.
pygame.event.poll() returns a single event from the event queue or pygame.NOEVENT if the queue is empty.
pygame.event.wait() returns a single event from the event queue or waits until an event can be returned.
pygame.event.pump() allows pygame to handle internal actions. Useful when you don't want to handle events from the event queue.

The window does not respond (freeze), because you do not handle the events. You have to handle the events by either pygame.event.pump() or pygame.event.get(), to keep the window responding.
See the documentation of pygame.event.pump():
For each frame of your game, you will need to make some sort of call to the event queue. This ensures your program can internally interact with the rest of the operating system.
Add an event loop, for instance:
run = True
while run:
for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
# [...]
Alternatively just pump the events:
while True:
pygame.event.pump()
# [...]
Minimal example: repl.it/#Rabbid76/PyGame-MinimalApplicationLoop

Pygame window is not responding [duplicate]

This simple piece of code crashes (the window is not responding) after a few seconds (around 5).
import pygame
from pygame.locals import *
pygame.init()
screen = pygame.display.set_mode((640, 480), 0, 24)
#clock = pygame.time.Clock()
#font = pygame.font.Font(None, 32)
cycles = 0
while True:
screen.fill(0)
# text = font.render('Cycles : %d' % cycles, True, (255, 255, 255))
# screen.blit(text, (100, 100))
cycles += 1
pygame.display.update()
If I uncomment the commented lines, I can clearly see the program going out of control when displaying values between 47 and 50.
I use python 2.7 and pygame 1.9.2, Windows 8 (64 bits) and Eclipse + PyDev.

Call pygame.event.get() at the beginning of the while loop.

You need to regularly make a call to one of four functions in the pygame.event module in order for pygame to internally interact with your OS. Otherwise the OS will think your game has crashed. So make sure you call one of these:
pygame.event.get() returns a list of all events currently in the event queue.
pygame.event.poll() returns a single event from the event queue or pygame.NOEVENT if the queue is empty.
pygame.event.wait() returns a single event from the event queue or waits until an event can be returned.
pygame.event.pump() allows pygame to handle internal actions. Useful when you don't want to handle events from the event queue.

The window does not respond (freeze), because you do not handle the events. You have to handle the events by either pygame.event.pump() or pygame.event.get(), to keep the window responding.
See the documentation of pygame.event.pump():
For each frame of your game, you will need to make some sort of call to the event queue. This ensures your program can internally interact with the rest of the operating system.
Add an event loop, for instance:
run = True
while run:
for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
# [...]
Alternatively just pump the events:
while True:
pygame.event.pump()
# [...]
Minimal example: repl.it/#Rabbid76/PyGame-MinimalApplicationLoop

Pygame built-in automatic pause?

I just recently learned Python and Pygame library.
I noticed that the rendering and main loop is automatically paused when I click and hold on the window menu bar (the bar with the title/icon).
For example, in a snake game, the snake will be moving every frame. When I click and hold (or drag) the window menu, the snake is not moving anymore and the game is "paused". When I release it, it resumes.
Is there a way to let the game NOT pause when I drag the windows menu bar?

When you drag the window only the event queue gets stopped.
So if your update/draw is not coupled with the event queue,
they will not be paused.
from pygame.locals import *
import pygame
import sys
import time;
import random;
pygame.init()
DISPLAYSURF = pygame.display.set_mode((530, 212))
while True:
t = random.random();
t *= 255;
for event in pygame.event.get():
if event.type == QUIT:
pygame.quit()
print event;
DISPLAYSURF.fill((int(t) % 255, int(t) % 255, int(t) % 255));
pygame.display.update()

This one is pretty easy, its seems you forgot to add a event callback.
state 1
while (sate != 0):
for event in pygame.event.get():