Tkinter menu for chosing a date

I am building a dropdown menu that would be used to choose a starting date. It has 3 cascades named year, month, day. The contents of the day cascade is generated so that the available days are true to the chosen year and month. It is possible/probable that the user is going to change the date several times during a single session.

My problem: When the user selects the year/month for the first time, the days commands get generated. Thereafter any new year/month combination, the following code just adds the commands to the cascade. So that the day cascade contains the days of two months.

I have been trying to make the code remove the old menubar entry daymenu and recreate it based on the new data. I would like to know, how does one do such chan开发者_如何学JAVAges to a preexisting, running menubar? I have searched the tkinter documentation, but could not out how to implement it.

import calendar as cal
import Tkinter as tk
import datetime
import os.path
window = tk.Tk()



# Menu variables:
year = tk.IntVar()
month = tk.IntVar()
day = tk.IntVar()
hour = tk.IntVar()
minute = tk.IntVar()
dur_hour = tk.IntVar()
dur_minute = tk.IntVar()
duration = tk.StringVar()
start = tk.StringVar()

#            list initializations    

list_of_years = []
list_of_months = []
list_of_hours = []
list_of_days = []
list_of_minutes = []


def year_seter(value):
    year.set(value)
    all_for_day()

def all_for_day(): #checks if the data needed to determine number of days in the month is present
    list_of_days = []
    y = year.get()
    m = month.get()
    lenght_of_month = cal.monthrange(y,m)
    lenght_of_month2 = lenght_of_month[1]
    if m != 0 and y != 0:
        make_daylist(lenght_of_month2)
        make_daymenu()

def month_seter(value):
    month.set(value)
    all_for_day()

def day_seter(value):
    day.set(value)

def time_parameters():
    the_date = datetime.datetime(1,1,1,0,0,0,0)
    the_date = the_date.now()
    end_year = the_date.year  
    make_yearlist(1995, end_year)
    make_monthlist()
    make_hourlist()
    make_minutelist()

def make_yearlist(the_year, end_year):
    while the_year <= end_year:
        list_of_years.append(the_year)
        the_year += 1

def make_monthlist():
    for i in range(12):
        list_of_months.append(i + 1)

def make_daylist(num_days):
    for i in range(num_days):
        list_of_days.append(i + 1)

def make_hourlist():
    for i in range(24):
        list_of_hours.append(i)

def make_minutelist():
    for i in range(60):
        list_of_minutes.append(i)

def make_daymenu():
    for the_day in list_of_days:
        daymenu.add_command(label=the_day, command=lambda : day_seter(the_day))
    window.config(menu=menubar)



# The following constructs the menu
time_parameters()
menubar = tk.Menu(window)

yearmenu = tk.Menu(menubar)
for the_year in list_of_years:
    yearmenu.add_command(label=str(the_year), command=lambda the_year=the_year: year_seter(the_year))
menubar.add_cascade(label = 'Year', menu=yearmenu)
window.config(menu=menubar)

monthmenu = tk.Menu(menubar)
for the_month in list_of_months:
    monthmenu.add_command(label=the_month, command=lambda the_month=the_month: month_seter(the_month))
menubar.add_cascade(label = 'Month', menu=monthmenu)
window.config(menu=menubar)  

daymenu = tk.Menu(menubar)
menubar.add_cascade(label = 'Day', menu=daymenu)
window.config(menu=menubar)

window.mainloop()

You could delete all entries in daymenu before adding new ones:

def make_daymenu():
    daymenu.delete(0,31) 
    for the_day in list_of_days:
        daymenu.add_command(label=the_day, command=lambda : day_setter(the_day))
    window.config(menu=menubar)

came across your code to select a date. Recently had to write a simple calendar for similar purposes. I can offer you that option as an alternative. I think this option is more convenient to choose the date.

import calendar, datetime, Tkinter

class calendarTk(Tkinter.Frame): # class calendarTk
    """ Calendar, the current date is exposed today, or transferred to date"""
    def __init__(self,master=None,date=None,dateformat="%d/%m/%Y",command=lambda i:None):
        Tkinter.Frame.__init__(self, master)
        self.dt=datetime.datetime.now() if date is None else datetime.datetime.strptime(date, dateformat) 
        self.showmonth()
        self.command=command
        self.dateformat=dateformat
    def showmonth(self): # Show the calendar for a month
        sc = calendar.month(self.dt.year, self.dt.month).split('\n')
        for t,c in [('<<',0),('<',1),('>',5),('>>',6)]: # The buttons to the left to the right year and month
            Tkinter.Button(self,text=t,relief='flat',command=lambda i=t:self.callback(i)).grid(row=0,column=c)
        Tkinter.Label(self,text=sc[0]).grid(row=0,column=2,columnspan=3) # year and month
        for line,lineT in [(i,sc[i+1]) for i in range(1,len(sc)-1)]: # The calendar
            for col,colT in [(i,lineT[i*3:(i+1)*3-1]) for i in range(7)]: # For each element
                obj=Tkinter.Button if colT.strip().isdigit() else Tkinter.Label # If this number is a button, or Label
                args={'command':lambda i=colT:self.callback(i)} if obj==Tkinter.Button else {} # If this button, then fasten it to the command
                bg='green' if colT.strip()==str(self.dt.day) else 'SystemButtonFace' # If the date coincides with the day of date - make him a green background
                fg='red' if col>=5 else 'SystemButtonText' # For the past two days, the color red
                obj(self,text="%s"% colT,relief='flat',bg=bg,fg=fg,**args).grid(row=line, column=col, ipadx=2, sticky='nwse') # Draw Button or Label
    def callback(self,but): # Event on the button
        if but.strip().isdigit():  self.dt=self.dt.replace(day=int(but)) # If you clicked on a date - the date change
        elif but in ['<','>','<<','>>']:
            day=self.dt.day
            if but in['<','>']: self.dt=self.dt+datetime.timedelta(days=30 if but=='>' else -30) # Move a month in advance / rewind
            if but in['<<','>>']: self.dt=self.dt+datetime.timedelta(days=365 if but=='>>' else -365) #  Year forward / backward
            try: self.dt=self.dt.replace(day=day) # We are trying to put the date on which stood
            except: pass                          # It is not always possible
        self.showmonth() # Then always show calendar again
        if but.strip().isdigit(): self.command(self.dt.strftime(self.dateformat)) # If it was a date, then call the command

if __name__ == '__main__':
    def com(f): print f
    root = Tkinter.Tk()
    root.title("Monthly Calendar")
    c=calendarTk(root,date="21/11/2006",dateformat="%d/%m/%Y",command=com)
    c.pack()

    root.mainloop()