How can change pixmap and move it alternatively in pyqt

Question

raiseTemmie.py

import random
import sys
import time

from PyQt5.QtGui import QPixmap
from PyQt5.QtCore import Qt, QTimer
from PyQt5.QtWidgets im         


        

Answer 1

A possible solution is to use qApp.processEvents() to update the data, this is recommended when tasks require little time as is your case, since the maximum time of the loop is 0.05sec*40=2sec.

def moving(self):
    distance=random.randint(10,40)
    direct =[random.randint(-1,2),random.randint(-1,2)]
    for x in range(0,distance):
        self.changeFoot()
        self.move(self.x()+5*direct[0],self.y()+5*direct[1])
        time.sleep(0.05)
        qApp.processEvents()

The solution may fail if time grows, another solution is to implement the timer and separate the tasks correctly as I show below:

class Example(QWidget):
    size=100
    imgNum=0
    imgQuantity=2

    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.setWindowFlags(Qt.FramelessWindowHint)
        self.setAttribute(Qt.WA_TranslucentBackground)
        self.setStyleSheet("background-color:transparent;")
        self.setGeometry(100, 100, 100, 100)
        self.setWindowFlags(Qt.SplashScreen | Qt.WindowStaysOnTopHint)
        self.label=QLabel(self)
        self.pixmaps=[QPixmap('left.png'),QPixmap('right.png'),QPixmap('stand.png')]
        for x in range(len(self.pixmaps)):
            self.pixmaps[x]=self.pixmaps[x].scaled(self.size,self.size,Qt.KeepAspectRatio)
        self.label.setPixmap(self.pixmaps[2])
        self.resize(self.pixmaps[2].width(),self.pixmaps[2].height())

        self.changeTimer=QTimer(self)
        self.changeTimer.timeout.connect(self.onTimeout)
        self.show()

    def moving(self):
        self.distance= random.randint(10,40)
        self.direct = QPoint(random.randint(-1,2), random.randint(-1,2))
        self.changeTimer.start(50)

    def onTimeout(self):
        if self.distance == 0:
            self.changeTimer.stop()
        else:
            self.changeFoot()
            self.move(self.pos() +  self.direct)
        self.distance -= 1   

    def changeFoot(self):
        if self.imgNum<self.imgQuantity-1:
            self.imgNum+=1
        else :
            self.imgNum=0
        self.label.setPixmap(self.pixmaps[self.imgNum])

    def mousePressEvent(self, QMouseEvent):
        self.label.setPixmap(self.pixmaps[2])
        self.changeTimer.stop()

    def keyPressEvent(self, QKeyEvent):
        if QKeyEvent.key() == Qt.Key_Escape:
            self.close()
        if QKeyEvent.key() == Qt.Key_G:
            self.moving()

Note: It is advisable to use self.close() instead of sys.exit() since the first gives time for the program to free resources and close properly.