Sometimes image can disappear when you move code into function.
It is common problem with bug in PhotoImage with garbage collector which removes image from memory when image is assigned to local variable (variable created in function). You have to assign image to global variable or to some object - ie …
pynput documentation shows examples how to monitoring the keyboard and how to monitoring the mouse
For keyboard it looks similar for this
furas.plfrom pynput import keyboard
# --- functions ---
def on_press(key):
# some code
def on_release(key):
# some code
# --- main ---
with keyboard.Listener(on_press=on_press, on_release=on_release) as listener:
listener.join()
For …
This code uses tkinter to get pressed/released key and display its keycode (scancode), keysym, char (unicode)
import tkinter as tk
# --- functions ---
def on_press(event):
# display pressed key
#print(event)
print('PRESS | keycode: {}, keysym: {}, char: {}'.format(event.keycode, event.keysym, event.char))
def on_release(event):
# display released key
#print …This simple example shows how to use Radiobutton and grid (and datetime) to create calendar for one month.
It also shows how to use command= in Radiobutton to execute function which changes text in few Labels
Because command= expects callback - it means function's name without () and arguments - so I use …
Python 3 wymaga użycia list() w pewnych momentach.
Za pomocą listy - nie dziala
a = [1,2,3,4,5,6,7,8,9]
print('A:', list(zip(a, a, a)) )
Za pomocą trzech iter (iterowania) - nie działa
it_1 = iter(a)
it_2 = iter(a …I wanted to try to use regex to get links to laureats in table on page List of Nobel Memorial Prize laureates in Economics
First I tried to use r'^/wiki/[A-Z][a-z]*_[A-Z][a-z]*$') because links looks like
/wiki/Paul_Krugman
but this gets also links like
/wiki/United_States …Chciałem użyć wyrażenia regularnego do pobrania linków do laureatów w tabeli na stronie List of Nobel Memorial Prize laureates in Economics
Najpierw próbowałem użyć r'^/wiki/[A-Z][a-z]*_[A-Z][a-z]*$') ponieważ wyglądało, że linki mają postać
/wiki/Paul_Krugman
ale okazało się, że to znajduje także linki postaci
/wiki/United_States …BTW: Python 3 needs soetime to use list().
Using list - doesn't work
a = [1,2,3,4,5,6,7,8,9]
print('A:', list(zip(a, a, a)) )
Using three iter() (iterating) - doesn't work
it_1 = iter(a)
it_2 = iter(a)
it_3 = iter(a …At start few images which I will use in examples. You can download them to use in own examples.
Tkinter uses PhotoImage to read PNG, GIF, PGM/PPM.
Older version didn't read PNG. All versions still can't read JPG or other formats.
img = tk.PhotoImage(file …To display image in web browser without saving image on disk you can use BytesIO to create file-like object in memory RAM which can be used like normal file to work with it without saving on disk.
This example uses matplotlib to create PNG in memory
import io
import matplotlib …Można użyć BytesIO do stworzenia obiektu podobnego do pliku (file-like object) ale trzymanego w pamięci RAM, który może być użyty do działań na pliku obrazka bez zapisywania na dysku.
Ten przykład używa matplotlib do stworzenia PNG w pamięci
import io
import matplotlib.pyplot as plt
import random
def generate_image():
# genereate …On page https://www.worldometers.info/coronavirus/#countries you can see Highcharts with "Total Coronavirus Death".
I tried to get data which it uses to display this chart.
It doesn't use AJAX to load data from other url so I couldn't read it directly. It also doesn't keep data in …
Na stronie https://www.worldometers.info/coronavirus/#countries jest wykres Highcharts z "Total Coronavirus Death".
Chciałem pobrać dane, które zostały użyte do wyświetlenia tego wykresu.
Wykres nie używa AJAX do wczytywania danych z innego url więc nie mogłem pobrać je bezpośredion. Wykres nie trzyma ich także w oddzielnej zmiennej w …
JavaScript can create three standard popup alerts: alert(), confirm() or prompt().
OKconfirm() and prompt() have button CANCELprompt() has text fieldTo press button OK
driver.switch_to.alert.accept() # press OK
To press button CANCEL (only in confirm() and prompt())
driver.switch_to.alert.dismiss …JavaScript może tworzyć trzy standarowe wyskakujące alerty: alert(), confirm() lub prompt().
OKconfirm() i prompt() mają przycisk CANCELprompt() ma pole tekstoweAby wcisnąć OK
driver.switch_to.alert.accept() # press 'OK'
Aby wcisnąć CANCEL (tylko w confirm() i prompt())
driver.switch_to.alert.dismiss() # press 'Cancel …Czasami requests niepoprawnie dekoduje tekst w response.text - używa ISO-8859-1 (Latin-1) zamiast UTF-8
nawet jeśli w HTML jest <meta charset="uft-8"> lub <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">.
Można to zobaczyć w response.headers['content-type'] oraz response.encoding
Problem jest ponieważ on nie używa <meta> ale nagłówka Content-Type …
Sometimes we want to change name of compressed file or put it in subfolder in zip file.
Function zipfile.write() can get new name which will be used inside zip file
write("folder_on_disk/name_on_disk", "folder_in_zip_file/name_in_zip_file")
Example
import zipfile
import os
z = zipfile.ZipFile('output.zip …Czasami chcemy zmienić nazwa kompresowanego pliku lub umieścić w podkatalogu w pliku zip.
Funkcja zipfile.write() może przyjąć nową nazwę, która będzie użyta wewntrz pliku zip.
write("folder_on_disk/name_on_disk", "folder_in_zip_file/name_in_zip_file")
Przykład
import zipfile
z = zipfile.ZipFile('output.zip', 'w')
z.write('images/image.gif', 'new_folder …Sometimes requests incorrectly decodes text in response.text - it uses ISO-8859-1 (Latin-1) instead of UTF-8
event if there is <meta charset="uft-8"> or <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> in HTML.
Problem is it doesn't uses <meta> but header Content-Type which usually has value text/html; charset=UTF-8 …
This example shows how to popup Toplevel window or Messagebox.
Second window uses Toplevel instead of Tk and it doesn't need mainloop.
import tkinter as tk
from tkinter.messagebox import showinfo
# --- functions ---
def popup_window():
window = tk.Toplevel()
label = tk.Label(window, text="Hello World!")
label.pack(fill='x', padx=50 …