PyQt5 Tutorial - Buttons and Events (Signals)

This PyQt5 tutorial will show you how to create buttons and trigger certain functions to run when they are clicked. It will also show you how to turn our previous code into an OOP implementation to make things easier moving forward.
Text-Based Tutorial: techwithtim.net/tutorials/pyq...
Playlist: • PyQt5 Tutorial - Setup...
Get %30 off a GitPod.io subscription with the code: TECHWITHTIM2FQBMX
www.gitpod.io/
◾◾◾◾◾
💻 Enroll in The Fundamentals of Programming w/ Python
tech-with-tim.teachable.com/p...
📸 Instagram: / tech_with_tim
🌎 Website techwithtim.net
📱 Twitter: / techwithtimm
⭐ Discord: / discord
📝 LinkedIn: / tim-rusci. .
📂 GitHub: github.com/techwithtim
🔊 Podcast: anchor.fm/tech-with-tim
💵 One-Time Donations: www.paypal.com/donate/?token=...
💰 Patreon: / techwithtim
◾◾◾◾◾◾
⚡ Please leave a LIKE and SUBSCRIBE for more content! ⚡
Tags:
- Tech With Tim
- Python Tutorials
- PyQt5 Tutorial
- PyQt5
- Python 3 PyQt5 Tutorial
- Buttons in PyQt5
- Buttons and Events PyQt5
#python #pyqt5 #qtdesigner

[@FrancescoTattoli]

Nice one pal. I was waiting for some GUI tutorial on python and yours is exactly what I was expecting from a tutorial: simple, clear and easy enough to understand (so long, at least). Keep up the good work

[@Mister_Merb]

To clarify, the "self.b1.clicked.connect(self.clicked)" line is a bit misleading. Tim made a method called "clicked" referenced in self.clicked but the QPushButton also has a clicked attribute. So, self.clicked references Tim's created method, while the .clicked attribute is built into self.b1. He probably should have renamed his method to avoid this confusion. Hope this helps someone.

[@mounaimomri554]

thx bro

[@Kamel419]

i was thinking the same... i would have rejected peer review if i got this. i'm a stickler about redefining existing names (whether that's a language keyword or in this case a method) and this is exactly why.

[@lewisjudah990]

I guess Im asking the wrong place but does any of you know of a way to get back into an instagram account..? I was stupid lost my account password. I appreciate any help you can give me!

[@tannerkannon2535]

@Lewis Judah Instablaster =)

[@lewisjudah990]

@Tanner Kannon Thanks for your reply. I got to the site thru google and Im in the hacking process atm. Takes a while so I will reply here later with my results.

[@nuklearboysymbiote]

you pressed the butt XD

[@theevildrummingsithlord1492]

Congrats, you've got 100 likes 🤣

[@wutzit2069]

We're pressing our own butts!

[@icicle8334]

I wanted to say this! You stole the brilliant comment from me! :)

[@ashish2099]

My gawd, even someone like me understood the concepts you were teaching. God bless you brother. I know only basics about oop concepts and yet I understood your explaination. Its people like you who make this world a better place. Thank you so much brother.

[@TalimaPictures]

Hi Tim. Your content is amazing. Easy to follow and well structured. Thanks. If this point has not been brought up, you could nest your clicked function under your window function. This way your clicked function has access to all the variables under your window function as they are in the same scope. That is if you don't want to define a class.

[@gastonscazzuso4113]

Thanks Tim !.. your tutorials are very clear, with a slow , easy & understandable English for non-native english spoken users!...

[@vitormendonca2905]

@@HalfABoolean_Studios But indian accent is really easy to understand most of the times, honestly i don't even care, they're awesome programing

[@soupnoodles]

"Now if thats confusing.. uh.. I dont really know what to say" Lmao

[@luizsaraiva4635]

Heyy, I'm from Brazil. You speak so damn well that it feels like I'm watching a class in portuguese. Your channel's content is amazing and helps me a lot. Thanks man.

[@alexanderhan9145]

Robust tutorial :) Looking forward to learn more PyQt5 from you!

[@sethallen9420]

You're a dawg for creating this content for free. You're helping so many people become better man. Thank you.

[@Troll3rHD]

lmao bro chill it's just a 10 min tutorial

[@wernerw.1328]

Which "any questions" do you mean. You explained everything exactly and understandable that there are no further questions. I will follow you through the next videos and enjoy it.

[@MrPadmanabham]

This is awesome.. i know some coders directly start with 'Class' but you started from basic and upgraded to "class". This is more helpful in understanding.

[@BinaryAdventure]

Nice tutorials Tim. I appreciate that you showed the raw code first BEFORE demoing the designer.

[@mitchellstevens3948]

Excellent tutorial! I am a beginner with PyQt, and your videos are quick and concise, helping me to rapidly get up to speed! KUDOS!

[@donniedorko3336]

Phenomenal series, thank you so much!

[@irreadings]

Your tutorials are so useful and clear and easy to follow. Great work, man! Thank you so much!

[@humanbeing7938]

I like how he explains complicated things so im actually learning form the tutorial and not just copying what he's typing

[@abdullahmoiz8151]

thank you very much, this was very clear and concise

[@hackytech7494]

Thanks for your tutorial. I was eagerly wanted to learn PyQt5 but i was not having any source to learn from. Your tutorials are very easy to follow.

[@keshavaaumritum1]

You make the best videos. Thank you, Tim.

[@michaelabiera]

Awesome vids. Simple and efficient.

[@mr2billylarson]

Thanks for yours videos they helps me a lot !!!

[@sribastavrajguru304]

Hi Tim, I really appreciate all your work, you are one of the favourite KZbinrs of mine. One suggestion... Please try to zoom out ur screen whenever possible and/or use a larger font size while recording. Thanks

[@mdaasil2329]

YOU ARE THE BEST. Tomorrow is my contest submission date and you saved my life. Bro

[@chinaguy101]

that's amazing, great thanks!

[@maedehshahabi4744]

You're awesome! it was great.

[@crystolica6591]

Your videos teach and explain more than all the other videos I watch. I think Im gonna have to buy a Tim mug.

[@TechWithTim]

😊

[@crystolica6591]

@@TechWithTim actually I purchased two mugs one to use and one to keep on my shelf. You're famous! Congrats on your job, try not to blow all the employees out of their socks. Not everybody can be a Tim you know.

[@TechWithTim]

@@crystolica6591 Haha, well I hope you enjoy the mugs!

[@arbazkhan8320]

Nice video man 👍

[@vadim6385]

your tutorials are great

[@user-jw9jr4xu1d]

Thanks! Very good explanation, very clear even for me - English is not my first language.

[@PodcastsInternacioanis]

Hey, I'm from Brazil, my english is not too good, but I can understand you perfectly, good job, thanks.

[@dannisisgt]

great video!!

[@Soljarag5]

Nice tut

[@dnetne5508]

Damn, interesting.. thank you for the tutorial

[@yousefrofa]

hi

[@BlueRacket9462]

Could you do a tutorial on docker after this series. I would really appreciate it because there aren’t a lot of tutorials on docker and you can explain things really clearly and effective.

[@justinkim2973]

saved my life, thank you

[@ten8217]

Thanks. I want to try something new and thanks for this. I love you

[@mohammedk.h.f3016]

This is a great video.

[@rezamohammadi8100]

very very good . thanx

[@poopscoot]

Hey Tim I feel as though you should inform everyone that if you don't tab things correctly while using sublime it can make the script fail. I spent about an hour copying your code trying to figure out why mine wasn't working, just to realize I had a few tabs off. Thanks for these videos so far!

[@stephenyuenger5077]

Thanks!

[@neopoligraf9991]

a very usefull information!!!

[@lbyfusyon7099]

You are the best.

[@MrELFP]

Gracias Tim.

[@JasonLopez]

Dude, just subscribed to you.. you explain shit perfectly... Keep it up.

[@katmanduYT]

thank you so much for doign this

[@pyluke5621]

very good tutorial

[@markruiz9397]

good first tutorial Tim

[@gamertronky8648]

With you programming becomes complicated. Without you programming is easy.

[@jaishukla1331]

In order to pass the label, you can use the lambda function and then refer it as a parameter for the function.

[@sushantdahal7809]

HELP When I run the exact same program @ 1:53 it says this: 'PyQt5.QtCore.pyqtBoundSignal' object has no attribute 'connnect'

[@tirthz]

Atlas Found a perfect tutorial series for myself

[@nikhilchauhan5837]

Next tutorial on pwa with python or python with react/react native☺️☺️ great work👍

[@adityaj7664]

Hey Tim! first of great video, I had this one question, say I wanted the label to change text once again, that is upon a second click I wanted it to display some other text, I tried connecting it once again but a single click directly leads to the second click's text and basically ignores the first one.

[@Didi-si5cs]

Tim, you are my Python professor. I learned a lot from you. Thank you very much. And would you please make a video about how to make a stand-alone executable file out of a whole project?

[@imaginaoYouTubesoquecomarrobas]

I believe he already has a video about PyInstaller, but I'm not sure.

[@MananGandhi]

@@imaginaoKZbinsoquecomarrobas it isn't pyconverter, it is pyinstaller

[@imaginaoYouTubesoquecomarrobas]

@@MananGandhi oops...

[@ChrisHalden007]

Great video !! Why does the label x and y seem to change when you click the button ? It looks like the new label shows a bit higher!?!

[@migueldomingos4570]

Love your tutorials!With this GUI knowledge ia am building a app to store your accounts(passwords, usernames etc) iwth facial detection to login in.

[@sainco3036]

thanks.

[@sitadevimuthkhod2574]

How do I use this for an exit button? os.system(cmd) QtCore.QCoreApplication.instance().quit() OR self.close() don't seem to work when put into def quitAction(self) and invoked through quitbtn.clicked.connect(self.quitAction)

[@ravitejabanda7897]

Hi Tim, can you make a video on how to resize a QMainWindow or a QWidget class to fit the dimensions of the screen being used(since every monitor has different dimensions) without inserting a layout to the widget.

[@kitgary]

I get warning for defining instance attribute outside the __init__ function by pylint, maybe you need to put them back to the __init__ function to follow best practice.

[@LeFoireux]

In the next video you will show us how to change the button's position?

[@hamzanaseer1529]

so if we have multiple buttons we have to create separate update functions for them?

[@AlanWagoner]

Nice video. What color theme are you using if you don't mind my asking?

[@jond532]

Hi Tim! I have a pushButton that calls a function to print something. When i click the pushButton i get a small delay before the function is called, do you know why?? edit: id like it to be instant.

[@dannisisgt]

Hi Tim, there is a error I got when close windows click over "X" right up window: An exception has occurred, use %tb to see the full traceback. SystemExit: 0 c:\users\danni\appdata\local\programs\python\python37-32\lib\site-packages\IPython\core\interactiveshell.py:3304: UserWarning: To exit: use 'exit', 'quit', or Ctrl-D. warn("To exit: use 'exit', 'quit', or Ctrl-D.", stacklevel=1)

[@kayombo1001]

Hi, thank you for sharing, please, what about if I want to button to behave like a calculator, when I click it shows up the number in a separet windows? Sorry for my broken English, Iam angolan and we Speak Portuguese.

[@fcmorena246]

thanks mate, can you make more videos' on this GUI please

[@Lofwyrf]

How to Add buttons via with at method? To Create a dynamic UI? Nice Vid btw :)

[@LoLGamers4Life]

Hi Tim, your videos are great, and y ou are an exceptionally talented young man. My question is....how do you personally go about learning this stuff? Do you read through the documentation on the PyQt website? Follow other tutorials? I'd love to learn the same way you learn.

[@tasarm4939]

W3 SCHOOL

[@danielandrews5357]

If you have already imported QtWidgets from PyQt5, why are you importing QApplication and QMainWindow separately?

[@preethishroychowdhury4160]

Hi Tim . Your videos are awesome, but I am having an issue in running the code in Python 3.7, Microsoft Visio. I am using Pylinter here. The error I am getting is " illegal target for annotation python(parser-16) 3.7" near self, def__init__(self): super(MyWindow, self).def__init__() self.setGeometry(100, 100, 300, 300) self.setWindowTitle("Roy's Test") self.initUI() please advise

[@khf3940]

you can pass in arguments to the function by using lambda, for e.g: pushButton.clicked.connect(lambda: clicked("hello")) instead of having to create classes and stuff

[@MrIsaacpr7]

Can I use PyQt to create a simple iPhone app with Python code?

[@jameswals9042]

Does this app run on Android?? Thanks, your tutorials rock.

[@dansam42]

Although all the OOP stuff is great, it seems to me that you would have to keep doing this labor intensive work every time you used Designer to tweak your GUI. Could you somehow pass the reference to QMainWindo ("win") to other methods that need access? Actually.... I'm not even sure if b1 is a member of the win class.... so maybe that won't work.

[@dev4life]

from where did you learned PyQt5?

[@davidkong9617]

if i edit the UI in designer, does the code in python file change too?

[@A_Szoros]

Hey! I have a little problem here : self.b1.clicked.connect(self.clicked()) its not working for me just with lambda ( self.b1.clicked.connect(lambda : self.clicked())) without lambda I get an "argument 1 has unexpected type 'NoneType'" error message. Anyone know why?

[@omkarsalunke804]

Hi Tim, thanks for your python tutorials that help me and my team to learn it in simple way. I am facing problem with 'designer'. I did pip for PyQt5-tools l, however 8 did find the designer under folder. Please help.

[@sameersehgal.90]

C:\Users\*****user name***\AppData\Local\Programs\Python\Python36\Lib\site-packages\pyqt5_tools\Qt\bin

[@gamingtweaks3065]

dude!its Giving error of tab error. some type space indention!! please help using sublime text 3 editor for this

[@danielbayer699]

hey Tim, thanks for putting in the effort on explaining, how python and qt works. After following the tutorial, everything works fine, except that MyWindow doesn't refresh without focusing another application on my Mac first, so even if the event of the clicked button is recognised accordingly which can be seen with print in terminal, the button / labels do no show the new values. Switching to Safari and going then back to the Python Application, the label shows the new value. Do you have any idea, why it doesn't refresh on the button event?

[@gabrieldessere-susini5363]

Hey man, have you figured out the solution? I'm still having this problem and can't seem to find anything about it. Thanks a lot.

[@Bryan-bh7cy]

same issue =.=

[@robertopicco1972]

It's a known problem of PyQt5. Add self.label.repaint() after self.label.adjustSize() within update function

[@Nataliee941]

Thanks Roberto Picco! Worked like a charm!

[@erikb7758]

@@robertopicco1972 Thank you! This fixed my issue.

[@ApplySkills]

Can someone explain b1.clicked.connect(clicked) is connect() a function or a method? which class is this found under?

[@geraldgeraffe2209]

Well, "clicked" is an event, so my guess is that there is some sort of event/signal class and that "clicked" is an object of that class that the button happens to have a variable for. So that would make it a method.

[@oussamaaatiq8293]

What is the difference between: super(Myw=Window,self).__init__() & super(QMainWindow).__init__() ?

[@inuwara6293]

when adjusting the window, labels and buttons doesn't get readjust so that's what i'm dealing with right now any kind of solution?

[@MoodSwingZX]

How about certein right clicked event connected to certein button

[@user-mn6jc5si2k]

which python interpreter are you using?

[@AmanKumar-bi4jl]

But if i use qt designer app then what should I do?

[@felyppekazan9467]

Where did this "connect" came from? I tried using DIR, HELP, searching the documentation etc and i didn't find it. Thus, PyCharm won't auto-complete this. (Really beginner here sry)

[@mariodrakos1029]

I am not familiar with PyQt but the documentation states, that QPushButton inherits from QAbstractButton, which inhertis from QWidiget, which finally inherits from QObject. The decription from QObject says, that you can connect or disconnect signals to a slot via the fucntions connect() and disconnect(). The documentation of QAbstractPushbutton lists the Signal clicked. I guess this is where the function connect derives from, but I am not 100 % sure. You can probably connect to different signals to the button in the same way. I.e.: "self.b1.pressed.connect(self.OnPressBtn)" or "self.b1.released.connect(self.OnReleaseBtn)" calling different methods for pressing and releasing the button. The documentation also has a chaoter about Signals and Slots, where the method connect() is described. www.riverbankcomputing.com/static/Docs/PyQt5/signals_slots.html#connect

[@keshan-spec]

dude.. can u help me out.. i mean like.. some tips and resources ... on how you self study .. a video maybe? please? .. it'd be really helpful. thank you

[@agustami7809]

How to upload image n save the path in database

[@safdafdasdfasdf6300]

When I made the code for the button and then press play, it gives me a syntax error. Any reason why?

[@SH1xmmY]

Is tkinter better or PQt5 or kivy??

[@mikoajwysocki6699]

Pozdrawiam Pana Piotra Kozierskiego :)

[@SamuelBachorik-Mrtapo8-ApeX]

Hey guys please how i can make this button work more times ? I mean click button 3 times and label will change 3 times to something else. Is that possible ?

[@user-hn1gp7fd2u]

Yeah That's simple. For eg- > self.label.setText(str(random.randint(0,5))) will show a new value b/w 0 to 5 in label each time button is pressed or Just store a value in a variable and update that variable to a new value each time button s pressed.

[@sarveshkhandelwal6039]

I get an import error when I run my python programs since I installed Anaconda, I need your help

[@mastertech901]

Could you just add the self.label.adjustSize() directly to the clicked method instead of creating an update method?

[@khmsalhuas1]

Yeah you can definitely do that.

[@kunalbose493]

Hi, nice tutorial but can you please tell how to fix the name error i am getting, it says NameError: name 'QApplicataion' is not defined

[@therealexodus7297]

Run the imports again

[@leoowww]

Hello, w When I run this code in visual code this error appears: cannot import name 'QMainwindow' from 'PyQt5.QtWidgets'

[@janmartinsky9101]

just do it in pycharm

[@preethishroychowdhury4160]

you can work without importing : from PyQt5.QtWidgets import QApplication, QMainWindow, QLabel, QPushButton

[@angelos3540]

global label label.setText... that would also work hehe