Wählen Sie einen zufälligen Schlüssel aus einem Wörterbuch, so dass es angezeigt werden kann

Question

Ich möchte einen zufälligen Schlüssel aus dem Wörterbuch zu blit verwenden, aber ich kann nicht herausfinden, was ich falsch mache.

# This is a skeleton code for small interactive programs using PyGame 
# interaction is handled in main() in a structured way. 
# "while true" has four main elements: 
# 1) declaring the STATE variable (and other useful variables) 
# 2) the event loop: 
#  - which only cycles if new events arrive 
#  - which contains the interactive transition conditionals 
# 3) a number of ATCs, handling the automatic transitions 
#  - are continuously checked to allow for timing conditions 
# 4) a number of drawing conditionals 


# Development Information 
# TODO: change ITC from E-S-E to E-E-S 

import pygame 
import sys 
from time import time 
import random 
from pygame.locals import * 
from pygame.compat import unichr_, unicode_ 


# Colors 
col_white = (250, 250, 250) 
col_black = (0, 0, 0) 
col_gray = (220, 220, 220) 
col_red = (250, 0, 0) 
col_green = (0, 200, 0) 
col_blue = (0, 0, 250) 
col_yellow = (250,250,0) 
BACKGR_COL = col_white 

SCREEN_SIZE = (700, 500) 

# Preparing the PyGame window 
pygame.init() 
pygame.display.set_mode(SCREEN_SIZE) 
pygame.display.set_caption("Skeleton") 
screen = pygame.display.get_surface() 
screen.fill(BACKGR_COL) 
font = pygame.font.Font(None, 80) 
font_small = pygame.font.Font(None, 40) 


def main(): 
    # Variables 
    STATE = "welcome" ## list, possible, states 

    # screen refresh loop 
    while True: 
     # setting the background color 
     pygame.display.get_surface().fill(BACKGR_COL)   

     # event loop (is only entered when an event occured) 
     for event in pygame.event.get(): 
      # Interactive transition conditionals (ITC) 
      if STATE == "welcome": 
       if event.type == KEYDOWN and event.key == K_SPACE: 
        STATE = "prepare_next_trial" 
        print(STATE) 
      # always include transition for quit events 
      if event.type == QUIT: 
       pygame.quit() 
       sys.exit() 

     # automatic transition conditionals (ATC) 
     if STATE == "prepare_next_trial": 
      screen.blit(mydict['sp1'],(248,148)) 

     # Drawing conditionals 
     if STATE == "welcome": 
      draw_welcome() 
     pygame.display.update() 
     # Picture dictionary 


    # end screen refresh loop 

# define draw functions and other functions 
def draw_welcome(): 
    text_surface = font.render("STROOP Experiment", True, col_black, BACKGR_COL) 
    text_rectangle = text_surface.get_rect() 
    text_rectangle.center = (SCREEN_SIZE[0]/2.0,150) 
    screen.blit(text_surface, text_rectangle) 
    text_surface = font_small.render("Press Spacebar to continue", True, col_black, BACKGR_COL) 
    text_rectangle = text_surface.get_rect() 
    text_rectangle.center = (SCREEN_SIZE[0]/2.0,300) 
    screen.blit(text_surface, text_rectangle) 

mydict = {'sp1': pygame.image.load('smartphone1.jpg'), 
      'sp2': pygame.image.load('smartphone2.jpg'), 
      'sp3': pygame.image.load('smartphone3.jpg'), 
      'tb1': pygame.image.load('tablet1.jpg'), 
      'tb2': pygame.image.load('tablet2.jpg'), 
      'tb3': pygame.image.load('tablet3.jpg')} 

# RUN 
main() 

Dies ist der Fehler, den ich bekommen: return f [int (self.random() * len (f))] # wirft Indexerror wenn seq KeyError leer: 1 Traceback (jüngste Aufforderung zuletzt):

Answer 1

löste es

# This is a skeleton code for small interactive programs using PyGame 
# interaction is handled in main() in a structured way. 
# "while true" has four main elements: 
# 1) declaring the STATE variable (and other useful variables) 
# 2) the event loop: 
#  - which only cycles if new events arrive 
#  - which contains the interactive transition conditionals 
# 3) a number of ATCs, handling the automatic transitions 
#  - are continuously checked to allow for timing conditions 
# 4) a number of drawing conditionals 


# Development Information 
# TODO: change ITC from E-S-E to E-E-S 

import pygame 
import sys 
import time 
import random 
from pygame.locals import * 
from pygame.compat import unichr_, unicode_ 


# Colors 
col_white = (250, 250, 250) 
col_black = (0, 0, 0) 
col_gray = (220, 220, 220) 
col_red = (250, 0, 0) 
col_green = (0, 200, 0) 
col_blue = (0, 0, 250) 
col_yellow = (250,250,0) 
BACKGR_COL = col_white 

SCREEN_SIZE = (700, 500) 

# Preparing the PyGame window 
pygame.init() 
pygame.display.set_mode(SCREEN_SIZE) 
pygame.display.set_caption("Skeleton") 
screen = pygame.display.get_surface() 
screen.fill(BACKGR_COL) 
font = pygame.font.Font(None, 80) 
font_small = pygame.font.Font(None, 40) 


def main(): 
    # Variables 
    STATE = "welcome" ## list, possible, states 

    # screen refresh loop 
    while True: 
     # setting the background color 
     pygame.display.get_surface().fill(BACKGR_COL)   

     # event loop (is only entered when an event occured) 
     for event in pygame.event.get(): 
      # Interactive transition conditionals (ITC) 
      if STATE == "welcome": 
       if event.type == KEYDOWN and event.key == K_SPACE: 
        STATE = "prepare_next_trial" 
        print(STATE) 
      # always include transition for quit events 
      if event.type == QUIT: 
       pygame.quit() 
       sys.exit() 

     # automatic transition conditionals (ATC) 
     if STATE == "prepare_next_trial": 
      screen.blit(random.choice(picture_list),(248,102)) 
     # Drawing conditionals 
     if STATE == "welcome": 
      draw_welcome() 
     pygame.display.update() 
     # Picture dictionary 


    # end screen refresh loop 

# define draw functions and other functions 
def draw_welcome(): 
    text_surface = font.render("STROOP Experiment", True, col_black, BACKGR_COL) 
    text_rectangle = text_surface.get_rect() 
    text_rectangle.center = (SCREEN_SIZE[0]/2.0,150) 
    screen.blit(text_surface, text_rectangle) 
    text_surface = font_small.render("Press Spacebar to continue", True, col_black, BACKGR_COL) 
    text_rectangle = text_surface.get_rect() 
    text_rectangle.center = (SCREEN_SIZE[0]/2.0,300) 
    screen.blit(text_surface, text_rectangle) 

# picture list 
picture_list = []  
SP1 = pygame.image.load("smartphone1.jpg").convert() 
picture_list.append(SP1) 
SP2 = pygame.image.load("smartphone2.jpg").convert() 
picture_list.append(SP2) 
SP3 = pygame.image.load("smartphone3.jpg").convert() 
picture_list.append(SP3) 
SP4 = pygame.image.load("tablet1.jpg").convert() 
picture_list.append(SP4) 
SP5 = pygame.image.load("tablet2.jpg").convert() 
picture_list.append(SP5) 
SP6 = pygame.image.load("tablet3.jpg").convert() 
picture_list.append(SP6) 
SP7 = pygame.image.load("laptop1.jpg").convert() 
picture_list.append(SP7) 
SP8 = pygame.image.load("laptop2.jpg").convert() 
picture_list.append(SP8) 
SP9 = pygame.image.load("laptop3.jpg").convert() 
picture_list.append(SP9) 
# RUN 
main()