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# prywatne notatki - Python, Linux, Machine Learning, etc.

Tkinter: How to use Radiobutton and grid() to create clickable calendar.

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 lambda to assing function with argument (datetime object with current date) which I can use in function

command=lambda x=current_day:on_click(x)

Full example

import tkinter as tk
import datetime

# --- functions ---

def on_click(date):
    #print(date)
    label_date['text'] = date.strftime('%a, %b %d, %Y')
    label_day['text'] = date.strftime('Day: %d')
    label_weekday['text'] = date.strftime('Weekday: %a')
    label_yearday['text'] = date.strftime('Day of the year: %-j')

# --- main ---

root = tk.Tk()

radiobutton_var = tk.StringVar()

year = 2020
month = 4

row = 0

for day in range(1, 32):
    try:
        current_day = datetime.datetime(year, month, day)
        date_str = current_day.strftime('%a, %m %d, %Y')
        weekday = current_day.weekday()

        radiobutton_day = tk.Radiobutton(root,
                                text=str(day), 
                                indicatoron=0,
                                variable=radiobutton_var,
                                value=date_str,
                                #value=day,
                                command=lambda x=current_day:on_click(x))

        radiobutton_day.grid(row=row, column=weekday, sticky='we')

        if weekday == 6:
            row += 1
            radiobutton_day['bg'] = '#faa'

    except ValueError as ex:
        print(ex) 
        break

label_date = tk.Label(root, text='?')
label_date.grid(row=10, columnspan=10)

label_day = tk.Label(root, text='Day: ?')
label_day.grid(row=11, columnspan=10)

label_weekday = tk.Label(root, text='Weekday: ?')
label_weekday.grid(row=12, columnspan=10)

label_yearday = tk.Label(root, text='Day of the year: ?')
label_yearday.grid(row=13, columnspan=10)

root.mainloop()

And code in class inherited from Frame so it can be used as widget to put many times

import tkinter as tk
import datetime

# --- classes ---

class Month(tk.Frame):

    def __init__(self, master, year, month, *args, **kwargs):

        super().__init__(master, *args, **kwargs)
        self.year = year
        self.month = month

        self.var = tk.StringVar()

        self.create()

    def on_click(self, date):
        #print(date)
        self.label_date['text'] = date.strftime('%a, %b %d, %Y')
        self.label_day['text'] = date.strftime('Day: %d')
        self.label_weekday['text'] = date.strftime('Weekday: %a')
        self.label_yearday['text'] = date.strftime('Day of the year: %-j')


    def create(self): 
        year = self.year
        month = self.month

        row = 0

        for day in range(1, 32):
            try:
                current_day = datetime.datetime(year, month, day)
                date_str = current_day.strftime('%a, %m %d, %Y')
                weekday = current_day.weekday()

                radiobutton_day = tk.Radiobutton(self,
                                        text=str(day), 
                                        indicatoron=0,
                                        variable=self.var,
                                        value=date_str,
                                        #value=day,
                                        command=lambda x=current_day:self.on_click(x))

                radiobutton_day.grid(row=row, column=weekday, sticky='we')

                if weekday == 6:
                    row += 1
                    radiobutton_day['bg'] = '#faa'

            except ValueError as ex:
                print(ex) 
                break

        # add empty label to create empty row when it use less rows    
        row += 1            
        while row < 6:
            l = tk.Label(self, text=" ")
            l.grid(row=row, column=0, sticky='we')
            row += 1

        self.label_date = tk.Label(self, text='?')
        self.label_date.grid(row=10, columnspan=10)

        self.label_day = tk.Label(self, text='Day: ?')
        self.label_day.grid(row=11, columnspan=10)

        self.label_weekday = tk.Label(self, text='Weekday: ?')
        self.label_weekday.grid(row=12, columnspan=10)

        self.label_yearday = tk.Label(self, text='Day of the year: ?')
        self.label_yearday.grid(row=13, columnspan=10)

# --- main ---

root = tk.Tk()

for x in range(1, 3):
    m = Month(root, 2020, x)
    m.pack(side='left')

root.mainloop()

Python: Pobieranie po trzy elementy z jednej listy za pomocą `zip()`

Pobieranie po trzy elementy z jednej listy

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 …

[ more | więcej ]

Scraping: How to use regular expression in BeautifulSoup to scrape Nobel Laureats from table in Wikipedia

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 …

[ more | więcej ]

Scraping: Jak użyć wyrażenia regularnego w BeautifulSoup aby pobrać Laureatów Nobla z tabeli w Wikipedii

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 …

[ more | więcej ]

Python: Taking 3 elements from one list using `zip()`

Taking 3 elements from one list

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 …

[ more | więcej ]

Tkinter: How to load, display and replace image on Label, Button or Canvas

Images

Few images used in examples

Reading image

Tkinter uses PhotoImage to read PNG, GIF, PGM/PPM.

Older version didn't read PNG. All version still can't read JPG or other formats.

img = tk.PhotoImage(file="smile-1.png")

It has to use named variable file=. It can't skip this name.

It …

[ more | więcej ]

Scraping: How to get data from interactive plot created with HighCharts

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 …

[ more | więcej ]

Scraping: Jak pobrać dane z interaktywnego wykresu stworzonego przez HighCharts

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 …

[ more | więcej ]

Selenium: How to close alert created by JavaScript

JavaScript can create three standard popup alerts: alert(), confirm() or prompt().

all of them have button OK
confirm() and prompt() have button CANCEL
prompt() has text field

To press button OK

driver.switch_to.alert.accept()  # press OK

To press button CANCEL (only in confirm() and prompt())

driver.switch_to.alert.dismiss …

[ more | więcej ]

Selenium: Jak zamknąć alert stworzony przez JavaScript

JavaScript może tworzyć trzy standarowe wyskakujące alerty: alert(), confirm() lub prompt().

wszystkie z nich mają przycisk OK
confirm() i prompt() mają przycisk CANCEL
prompt() ma pole tekstowe

Aby wcisnąć OK

driver.switch_to.alert.accept()   # press 'OK'

Aby wcisnąć CANCEL (tylko w confirm() i prompt())

driver.switch_to.alert.dismiss()   # press 'Cancel …

[ more | więcej ]

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