GUI TKINTER

Class Entry

It is used to read single-line text / Password.

Constructor:
Entry( master , **options . . )	Where o master: indicates the parent window. o Options: additional parameters.

Options
textvariable	A variable associated with Text-Box.
bg / fg	Background / Foreground color.
cursor	cursor (arrow, dot,cross etc.).
font	The font used for the text
justify	text alignment can be CENTER, LEFT, or RIGHT. For ex: justify=CENTER
relief	It can be SUNKEN, RAISED, GROOVE, RIDGE etc.
show	Indicates the password char . For ex: show="*"
state	NORMAL/DISABLED. The default is state=NORMAL.
width	Width of textbox in chars

Methods
get()	Gets the current contents of the entry field. It will return the strin
insert ( index, data )	Inserts data at specified index.
delete ( first, last=None )	Deletes chars from first to last. If the second argument is omitted, only the single character at position first is deleted. If last=END is set then it will remove all chars.
config( **options )	Modifies options. For ex: t1.config(bg="yellow", fg="red")

#Write a program to display text from textbox.

from tkinter import *
def showdata():
  data=t1.get()
  print(data)
win=Tk()
win.geometry("500x300")
t1=Entry(win)
t1.pack()
b1=Button(win,text="Show",command=showdata)
b1.pack()
win.mainloop()

Welcome to CCIT

#Write a program to check if given password is valid or Not. (pwd-admin)

from tkinter import *
def checkpwd():
  data=t1.get()
  if data=="admin":
    print("Valid User")
  else:
    print("InValid User")
win=Tk()
win.geometry("300x200")
t1=Entry(win,show="*",justify=CENTER)
t1.pack()
b1=Button(win,text="Check",command=checkpwd)
b1.pack()
win.mainloop()

Valid User

User Defined Window Class

We can design our own window class by extending it from class Tk .
In this derived class we can add additional features/Components according to our requirement.

#Example

from tkinter import *
class MyFrame(Tk):
  def __init__(self):
    super().__init__()
    self.geometry("200x300")
    self.configure(bg="yellow")
win=MyFrame()
win.mainloop()

#Write a program to check if given password is valid or Not. (pwd-admin)

from tkinter import *
class MyWin(Tk):
  def __init__(self):
    super().__init__()
    self.geometry("300x200")
    self.txt=Entry(self,show="*",justify=CENTER)
    self.txt.pack()
    self.btn=Button(self,text="Check",command= 
    self.checkpwd)
    self.btn.pack()
 def checkpwd(self):
    pwd=self.txt.get()
    if pwd=="admin":
      print("Valid User")
    else:
      print("Invalid User")
    self.txt.delete(0,last=END)
win=MyWin()
win.mainloop()

Valid User

#Write a program to exchange data from 2 textboxes.

from tkinter import *
class MyWin(Tk):
  def __init__(self):
    super().__init__()
    self.geometry("300x200")
    self.t1=Entry(self)
    self.t1.pack()
    self.btn=Button(self,text="Exchange",command=self.exg)
    self.btn.pack()
    self.t2=Entry(self)
    self.t2.pack()
  def exg(self):
    s1=self.t1.get()
    s2=self.t2.get()
    self.t1.delete(0,END)
    self.t2.delete(0,END)
    self.t1.insert(0,s2)
    self.t2.insert(0,s1)
win=MyWin()
win.mainloop()

CCITcoder

Introduction to Python

Conditional statements

Iterative statements

Functions

OOPs

Collection

Module and Exception

DateBase

Inherintance

GUI