This question already has answers here:
Why is my Button's command executed immediately when I create the Button, and not when I click it? [duplicate]
(5 answers)
Closed 6 months ago.
Why is not working? PyCharm message: Expected type 'Union[str, () -> Any]', got 'None' instead. I do not understand.
Part of a project. Thanks for the reply.
import tkinter as tk
class ClassA(tk.Tk):
def __init__(self):
super().__init__()
self.button = tk.Button(self, text="Start", command=ClassA.a_method())
self.button.pack()
#staticmethod
def a_method():
print('a')
if __name__ == '__main__':
app = ClassA()
app.mainloop()
Remove parenthesis bracket in line 9.
Change this:
self.button = tk.Button(self, text="Start", command=ClassA.a_method())
to:
self.button = tk.Button(self, text="Start", command=ClassA.a_method)
Related
I'm trying to build a simple app with bokeh where the histogram updates when a new variable is selected in the dropdown menu. The histogram indeed updates but not the x-axis (the categories). I read similar issues on different forums but none of the answers solved my issues.
Here is my code:
def modify_doc(doc):
def make_dataset(var_name):
CountDf=pd.DataFrame(TrainData[var_name].value_counts()).reset_index()
CountDf.columns=['CATEGORY','COUNT']
#return(CountDf)
return(ColumnDataSource(CountDf))
def make_plot(src):
#p=figure(x_range=list(src.data['CATEGORY']))
p=figure(x_range=FactorRange(factors=list(src.data['CATEGORY'])))
p.x_range.factors = src.data['CATEGORY']
p.vbar(x='CATEGORY', top='COUNT', width=0.9, source=src)
p.xaxis.major_label_orientation = math.pi/2
return(p)
# Update function takes three default parameters
def update(attr, old, new):
new_src = make_dataset(new)
src.data.update(new_src.data)
p.x_range.factors = src.data['CATEGORY']
var_selection = Dropdown(label='Variable to plot:',menu=CatVarLst, value=CatVarLst[0])
var_selection.on_change('value',update)
controls = WidgetBox(var_selection)
initial_var=CatVarLst[0]
src=make_dataset(initial_var)
p = make_plot(src)
layout = column(controls, p)
doc.add_root(layout)
Thank you for your help!
IMAGE WITH ERROR IN MY PYTHON GAME:
I want to run my application, but see this error, how to fix it?
Image with a correctly format is not a possible to open, this is a simple game make in a Python
import random
from livewires import games
games.init(screen_width=640,screen_height=480,fps=50)
class Ship(games.Sprite):
def update(self):
if games.keyboard.is_pressed(games.K_RIGHT):
self.angle+=1
if games.keyboard.is_pressed(games.K_LEFT):
self.angle-=1
if games.keyboard.is_pressed(games.K_1):
self.angle=0
if games.keyboard.is_pressed(games.K_2):
self.angle=90
if games.keyboard.is_pressed(games.K_3):
self.angle=180
if games.keyboard.is_pressed(games.K_4):
self.angle=270
class Asteroid(games.Sprite):
SMALL = 1
MEDIUM = 2
LARGE = 3
images={SMALL : games.load_image("asteroida_s.bmp"),
MEDIUM : games.load_image('asteroida_m.bmp'),
LARGE : games.load_image('asteroida_l.bmp') }
SPEED=2
def main():
nebula_image=games.load_image("mglawica.jpg")
games.screen.background=nebula_image
for i in range(8):
x=random.randrange(games.screen.width)
y=random.randrange(games.screen.height)
size-random.choice([Asteroid.SMALL,Asteroid.MEDIUM,Asteroid.LARGE,])
new_asteroid=Asteroid(x=x,y=y,size=size)
game.screen.add(new_asteroid)
games.screen.mainloop()
def main():
nebula_image=games.load_image("mglawica.jpg",transparent=false)
games.screen.background=nebula_image
ship_image=games.load_image("statek.bmp")
the_ship=Ship(image=ship_image,
x=games.scren.width/2,
y=games.scren.height/2)
games.scren.add(the_ship)
games.screen.mainloop()
def play(self):
nebula_image=games.load_image("mglawica.jpg")
games.screen.background=nebula_image
self.advance()
games.screen.mainloop()
def advanced(self):
self.level+=1
BUFFER=150
for i in range(self.level):
x_min=random.randrage(BUFFER)
y_min=BUFFER-x_min
x=self.ship.x+x_distance
y=self.ship.y+y_distance
x%=games.screen.width
y%=games.screen.height
new_asteroid=Asteroid(game=self,x=x,y=y,size=Asteroid.LARGE)
game.screen.add(new_asteroid)
def end():
end_message=games.Message(value="Koniec gry",
size=90,
color=color.red,
x=games.screen.width/2,
y=games.screen.height/2,
lifetime=10*games.scren.fps,after_death=games.screen.quit,
is_sollideable=False)
games.scren.add(end_message)
def die(self):
if self.size !=Asteroid.SMALL:
for i in range(Asteroid.SMALL):
new_asteroid=Asteroid(x=self.x,
y=self.y,
size=self.size-1)
game.screen.add(new_asteroid)
self.destroy()
While your code is very messy (no indentation), I think I have a way to fix it. First, I question your need to import livewire, and also wonder why you marked this question as pygame. You never imported pygame. So my solution will be written in pygame.
First, you have to load the images (and if you want assign it to a variable):
image = pygame.image.load(filename)
Then, you have to convert the Surface, or basically just the image.
image = pygame.image.load(filename).convert()
I am a new pyqtgraph users,try to "Embedding widgets inside PyQt applications"following the instructions in http://www.pyqtgraph.org/documentation/how_to_use.html. in my example I promote Graphics view to PlotWidget, then save as "test2.ui", also follow the "crosshair/mouse interaction" example,my code:
import sys
import numpy
from PyQt5 import QtCore, QtGui,uic,QtWidgets
from PyQt5.QtWidgets import *
import pyqtgraph as pg
import os
hw,QtBaseClass=uic.loadUiType("test.ui")
def gaussian(A, B, x):
return A * numpy.exp(-(x / (2. * B)) ** 2.)
class MyApp(QtWidgets.QMainWindow, hw):
def __init__(self):
super().__init__()
self.setupUi(self)
winSize=self.size()
self.view.resize(winSize.width(),winSize.height())
x = numpy.linspace(-5., 5., 10000)
y =gaussian(5.,0.2, x)
self.p=self.view.plot(x,y)
proxy = pg.SignalProxy(self.view.scene().sigMouseMoved, rateLimit=60, slot=self.mouseMoved)
self.view.enableAutoRange("xy", True)
def mouseMoved(evt):
print("mouseTest")
mousePoint = self.p.vb.mapSceneToView(evt[0])
label.setText(
"<span style='font-size: 14pt; color: white'> x = %0.2f, <span style='color: white'> y = %0.2f</span>" % (
mousePoint.x(), mousePoint.y()))
if __name__ == "__main__":
app = QtWidgets.QApplication(sys.argv)
window = MyApp()
window.show()
sys.exit(app.exec_())
it seems not get the mouse move event;
after change
proxy = pg.SignalProxy(self.view.scene().sigMouseMoved, rateLimit=60, slot=self.mouseMoved)
to
self.view.scene().sigMouseMoved.connect(self.mouseMoved),
output"MouseTest",but program imediatly crash.
can any one give me some help
Two things:
Re: Crashing
It seems as if you haven't placed a label in the GUI to modify, perhaps your code is seeing this and kicks it back to you. If you're using qtDesigner, it is likely defined as self.label, and in my GUI, I was required to use self.label to reference it.
Re: mouseMoved function
I was just struggling with a similar issue of it not working. I was able to get mine to work by changing the evt[0] to simply evt, something I think they moved to from pyqt4 to pyqt5.
Here's an example of what I was able to get to work:
..........setup code above... IN THE setupUi function:
..........setup code above...
Plotted = self.plot
vLine = pg.InfiniteLine(angle=90, movable=False)
hLine = pg.InfiniteLine(angle=0, movable=False)
Plotted.addItem(vLine, ignoreBounds=True)
Plotted.addItem(hLine, ignoreBounds=True)
Plotted.setMouseTracking(True)
Plotted.scene().sigMouseMoved.connect(self.mouseMoved)
def mouseMoved(self,evt):
pos = evt
if self.plot.sceneBoundingRect().contains(pos):
mousePoint = self.plot.plotItem.vb.mapSceneToView(pos)
self.label.setText("<span style='font-size: 15pt'>X=%0.1f, <span style='color: black'>Y=%0.1f</span>" % (mousePoint.x(),mousePoint.y()))
self.plot.plotItem.vLine.setPos(mousePoint.x())
self.plot.plotItem.hLine.setPos(mousePoint.y()
...the if__name__ =="__main__": function .....
In my case, I did not pass the proxy statement, and instead just went for the sigMouseMoved since it already passes the information the proxy would. I think this was in the example in pyqt5 (and commented out) because it was the change. However, the comment didn't specifically state this.
I am currently writing a small game under separate files and am having an issue with pygame.sprite.Sprite. Every time I go to run the player class I get this error AttrbuteError: "module" object has no attribute "sprite". I have done many searches on this site and have also looked on the pygame website for answers but I have only found other bits of code and answers that do not resolve my current issue. If anyone could help me with my issue that would be great.
here's my class for the player:
import pygame
import pygame.sprite as Sprite
class player(Sprite.sprite):
def _init_(self,plyrmovement,plyrhealth,plyrdirection):
Sprite.Sprite._init_(self)
def plyrmovement(left,right):
position=[100,100]
direct_left = 'player left'
direct_right = 'player right'
def right():
if event.key == ord('d'):
position[0] += 5
plyrdirection = direct_right
sprite.sprite='playerleft'
def left():
if event.key == ord('a'):
position[0] -= 5
plyrdirection = direct_left
sprite.sprite = 'playerright'
def shoot(self,bullet):
if event.key == K_SPACE:
bullet.bulletmove
def plyrhealth(self):
self.health = 100
class bullet(pygame.Sprite.Sprite):
def _init_(self,bulletmove,bulletdamage):
pygame.image.load('bullet sprite.png')
The full name is pygame.sprite.Sprite.
If you use import pygame.sprite as Sprite then correct name is player(Sprite.Sprite) not player(Sprite.sprite) - see upper S in both Sprite.
As for me it is better to use class player(pygame.sprite.Sprite) and bullet(pygame.sprite.Sprite) - lower s in first sprite and upper S in second Sprite - and without import pygame.sprite as Sprite
import pygame
class Player(pygame.sprite.Sprite):
def __init__(self,plyrmovement, plyrhealth, plyrdirection):
pygame.sprite.Sprite.__init__(self)
# ...rest...
class Bullet(pygame.sprite.Sprite):
def __init__(self, bulletmove, bulletdamage):
pygame.sprite.Sprite.__init__(self)
# ...rest...
BTW:
it has to be two _ before and after init
you could use CamelCase names for classes - Player, Bullet - similar to Sprite, Rect. See suggestions in PEP8 (PEP 0008 -- Style Guide for Python Code)(PEP8 - Class Names)
use empty line before class and def to make code more readable (PEP8 - Blank Lines).
I have managed to use suggested code in order to render HTML from a webpage and then parse, find and use the text as wanted. I'm using PyQt4. However, the webpage I am interested in is updated frequently and I want to rerender the page and check the updated HTML for new info.
I thus have a loop in my pythonscript so that I sort of start all over again. However, this makes the program crash. I have searched the net and found out that this is to be expected, but I have not found any suggestion on how to do it correctly. It must be simple, I guess?
from PyQt4.QtGui import *
from PyQt4.QtCore import *
from PyQt4.QtWebKit import *
class Render (QWebPage):
def __init__(self, url):
self.app = QApplication(sys.argv)
QWebPage.__init__(self)
self.loadFinished.connect(self._loadFinished)
self.mainFrame().load(QUrl(url))
self.app.exec_()
def _loadFinished(self, result):
self.frame = self.mainFrame()
self.app.quit()
r = Render(url)
html = r.frame.toHtml()
S,o when I hit r=Render(url) the second time, it crashes. S,o I am looking for something like r = Rerender(url).
As you might guess, I am not much of a programmer, and I usually get by by stealing code I barely understand. But this is the first time I can't find an answer, so I thought I should ask a question myself.
I hope my question is clear enough and that someone has the answer.
Simple demo (adapt to taste):
import sys, signal
from PyQt4 import QtCore, QtGui, QtWebKit
class WebPage(QtWebKit.QWebPage):
def __init__(self, url):
super(WebPage, self).__init__()
self.url = url
self.mainFrame().loadFinished.connect(self.handleLoadFinished)
self.refresh()
def refresh(self):
self.mainFrame().load(QtCore.QUrl(self.url))
def handleLoadFinished(self):
print('Loaded:', self.mainFrame().url().toString())
# do stuff with html ...
print('Reloading in 3 seconds...\n')
QtCore.QTimer.singleShot(2000, self.refresh)
if __name__ == '__main__':
signal.signal(signal.SIGINT, signal.SIG_DFL)
app = QtGui.QApplication(sys.argv)
webpage = WebPage('http://en.wikipedia.org/')
print('Press Ctrl+C to quit\n')
sys.exit(app.exec_())