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tkinter

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Definition
The tkinter provide the classes for the creating the widgets.

Syntax
tkinter()

Examples
The reversed loop generated the oval through Canvas.create_oval method.
from tkinter import *

master = Tk()
master.title("Click to generate random ovals")

def bpress(click):

    import random
    color_list= ['snow', 'ghostwhite', 'whitesmoke', 'gainsboro', 'floralwhite', 'oldlace',
    'linen', 'antiquewhite', 'papayawhip', 'blanchedalmond', 'bisque', 'peachpuff',
    'navajowhite', 'lemonchiffon', 'mintcream', 'azure', 'aliceblue', 'lavender',
    'lavenderblush', 'mistyrose', 'darkslategray', 'dimgray', 'slategray',
    'lightslategray', 'gray', 'lightgrey', 'midnightblue', 'navy', 'cornflowerblue', 'darkslateblue',
    'slateblue', 'mediumslateblue', 'lightslateblue', 'mediumblue', 'royalblue',  'blue',
    'dodgerblue', 'deepskyblue', 'skyblue', 'lightskyblue', 'steelblue', 'lightsteelblue',
    'lightblue', 'powderblue', 'paleturquoise', 'darkturquoise', 'mediumturquoise', 'turquoise',
    'cyan', 'lightcyan', 'cadetblue', 'mediumaquamarine', 'aquamarine', 'darkgreen', 'darkolivegreen',
    'darkseagreen', 'seagreen', 'mediumseagreen', 'lightseagreen', 'palegreen', 'springgreen',
    'lawngreen', 'mediumspringgreen', 'greenyellow', 'limegreen', 'yellowgreen',
    'forestgreen', 'olivedrab', 'darkkhaki', 'khaki', 'palegoldenrod', 'lightgoldenrodyellow',
    'lightyellow', 'yellow', 'gold', 'lightgoldenrod', 'goldenrod', 'darkgoldenrod', 'rosybrown',
    'indianred', 'saddlebrown', 'sandybrown',
    'darksalmon', 'salmon', 'lightsalmon', 'orange', 'darkorange',
    'coral', 'lightcoral', 'tomato', 'orangered', 'red', 'hotpink', 'deeppink', 'pink', 'lightpink',
    'palevioletred', 'maroon', 'mediumvioletred', 'violetred',
    'mediumorchid', 'darkorchid', 'darkviolet', 'blueviolet', 'purple', 'mediumpurple',
    'thistle', 'snow2', 'snow3',
    'snow4', 'seashell2', 'seashell3', 'seashell4', 'AntiqueWhite1', 'AntiqueWhite2',
    'AntiqueWhite3', 'AntiqueWhite4', 'bisque2', 'bisque3', 'bisque4', 'PeachPuff2',
    'PeachPuff3', 'PeachPuff4', 'NavajoWhite2', 'NavajoWhite3', 'NavajoWhite4',
    'LemonChiffon2', 'LemonChiffon3', 'LemonChiffon4', 'cornsilk2', 'cornsilk3',
    'cornsilk4', 'ivory2', 'ivory3', 'ivory4', 'honeydew2', 'honeydew3', 'honeydew4',
    'LavenderBlush2', 'LavenderBlush3', 'LavenderBlush4', 'MistyRose2', 'MistyRose3',
    'MistyRose4', 'azure2', 'azure3', 'azure4', 'SlateBlue1', 'SlateBlue2', 'SlateBlue3',
    'SlateBlue4', 'RoyalBlue1', 'RoyalBlue2', 'RoyalBlue3', 'RoyalBlue4', 'blue2', 'blue4',
    'DodgerBlue2', 'DodgerBlue3', 'DodgerBlue4', 'SteelBlue1', 'SteelBlue2',
    'SteelBlue3', 'SteelBlue4', 'DeepSkyBlue2', 'DeepSkyBlue3', 'DeepSkyBlue4',
    'SkyBlue1', 'SkyBlue2', 'SkyBlue3', 'SkyBlue4', 'LightSkyBlue1', 'LightSkyBlue2',
    'LightSkyBlue3', 'LightSkyBlue4', 'SlateGray1', 'SlateGray2', 'SlateGray3',
    'SlateGray4', 'LightSteelBlue1', 'LightSteelBlue2', 'LightSteelBlue3',
    'LightSteelBlue4', 'LightBlue1', 'LightBlue2', 'LightBlue3', 'LightBlue4',
    'LightCyan2', 'LightCyan3', 'LightCyan4', 'PaleTurquoise1', 'PaleTurquoise2',
    'PaleTurquoise3', 'PaleTurquoise4', 'CadetBlue1', 'CadetBlue2', 'CadetBlue3',
    'CadetBlue4', 'turquoise1', 'turquoise2', 'turquoise3', 'turquoise4', 'cyan2', 'cyan3',
    'cyan4', 'DarkSlateGray1', 'DarkSlateGray2', 'DarkSlateGray3', 'DarkSlateGray4',
    'aquamarine2', 'aquamarine4', 'DarkSeaGreen1', 'DarkSeaGreen2', 'DarkSeaGreen3',
    'DarkSeaGreen4', 'SeaGreen1', 'SeaGreen2', 'SeaGreen3', 'PaleGreen1', 'PaleGreen2',
    'PaleGreen3', 'PaleGreen4', 'SpringGreen2', 'SpringGreen3', 'SpringGreen4',
    'green2', 'green3', 'green4', 'chartreuse2', 'chartreuse3', 'chartreuse4',
    'OliveDrab1', 'OliveDrab2', 'OliveDrab4', 'DarkOliveGreen1', 'DarkOliveGreen2',
    'DarkOliveGreen3', 'DarkOliveGreen4', 'khaki1', 'khaki2', 'khaki3', 'khaki4',
    'LightGoldenrod1', 'LightGoldenrod2', 'LightGoldenrod3', 'LightGoldenrod4',
    'LightYellow2', 'LightYellow3', 'LightYellow4', 'yellow2', 'yellow3', 'yellow4',
    'gold2', 'gold3', 'gold4', 'goldenrod1', 'goldenrod2', 'goldenrod3', 'goldenrod4',
    'DarkGoldenrod1', 'DarkGoldenrod2', 'DarkGoldenrod3', 'DarkGoldenrod4',
    'RosyBrown1', 'RosyBrown2', 'RosyBrown3', 'RosyBrown4', 'IndianRed1', 'IndianRed2',
    'IndianRed3', 'IndianRed4', 'sienna1', 'sienna2', 'sienna3', 'sienna4', 'burlywood1',
    'burlywood2', 'burlywood3', 'burlywood4', 'wheat1', 'wheat2', 'wheat3', 'wheat4', 'tan1',
    'tan2', 'tan4', 'chocolate1', 'chocolate2', 'chocolate3', 'firebrick1', 'firebrick2',
    'firebrick3', 'firebrick4', 'brown1', 'brown2', 'brown3', 'brown4', 'salmon1', 'salmon2',
    'salmon3', 'salmon4', 'LightSalmon2', 'LightSalmon3', 'LightSalmon4', 'orange2',
    'orange3', 'orange4', 'DarkOrange1', 'DarkOrange2', 'DarkOrange3', 'DarkOrange4',
    'coral1', 'coral2', 'coral3', 'coral4', 'tomato2', 'tomato3', 'tomato4', 'OrangeRed2',
    'OrangeRed3', 'OrangeRed4', 'red2', 'red3', 'red4', 'DeepPink2', 'DeepPink3', 'DeepPink4',
    'HotPink1', 'HotPink2', 'HotPink3', 'HotPink4', 'pink1', 'pink2', 'pink3', 'pink4',
    'LightPink1', 'LightPink2', 'LightPink3', 'LightPink4', 'PaleVioletRed1',
    'PaleVioletRed2', 'PaleVioletRed3', 'PaleVioletRed4', 'maroon1', 'maroon2',
    'maroon3', 'maroon4', 'VioletRed1', 'VioletRed2', 'VioletRed3', 'VioletRed4',
    'magenta2', 'magenta3', 'magenta4', 'orchid1', 'orchid2', 'orchid3', 'orchid4', 'plum1',
    'plum2', 'plum3', 'plum4', 'MediumOrchid1', 'MediumOrchid2', 'MediumOrchid3',
    'MediumOrchid4', 'DarkOrchid1', 'DarkOrchid2', 'DarkOrchid3', 'DarkOrchid4',
    'purple1', 'purple2', 'purple3', 'purple4', 'MediumPurple1', 'MediumPurple2',
    'MediumPurple3', 'MediumPurple4', 'thistle1', 'thistle2', 'thistle3', 'thistle4',
    'gray1', 'gray2', 'gray3', 'gray4', 'gray5', 'gray6', 'gray7', 'gray8', 'gray9', 'gray10',
    'gray11', 'gray12', 'gray13', 'gray14', 'gray15', 'gray16', 'gray17', 'gray18', 'gray19',
    'gray20', 'gray21', 'gray22', 'gray23', 'gray24', 'gray25', 'gray26', 'gray27', 'gray28',
    'gray29', 'gray30', 'gray31', 'gray32', 'gray33', 'gray34', 'gray35', 'gray36', 'gray37',
    'gray38', 'gray39', 'gray40', 'gray42', 'gray43', 'gray44', 'gray45', 'gray46', 'gray47',
    'gray48', 'gray49', 'gray50', 'gray51', 'gray52', 'gray53', 'gray54', 'gray55', 'gray56',
    'gray57', 'gray58', 'gray59', 'gray60', 'gray61', 'gray62', 'gray63', 'gray64', 'gray65',
    'gray66', 'gray67', 'gray68', 'gray69', 'gray70', 'gray71', 'gray72', 'gray73', 'gray74',
    'gray75', 'gray76', 'gray77', 'gray78', 'gray79', 'gray80', 'gray81', 'gray82', 'gray83',
    'gray84', 'gray85', 'gray86', 'gray87', 'gray88', 'gray89', 'gray90', 'gray91', 'gray92',
    'gray93', 'gray94', 'gray95', 'gray97', 'gray98', 'gray99']

    r=range(0,1000)
    for i in reversed(r):
            
        
        x1=click.x-i
        y1=click.y-i
        x2=click.x+i
        y2=click.y+i
        color=random.sample(color_list,1)
        canvas.create_oval(x1,y1,x2,y2, fill=color)

                
canvas = Canvas(master,width=500, height=500, background="black" )
canvas.pack(expand = YES)
canvas.bind( "<Double-1>", bpress )


master.mainloop()



 
There simple mainloop widget(). 
import tkinter
class maintloop1():
    def __init__(self,a):
        self.a=a
        a.mainloop()

x=tkinter.Tk()
maintloop1(x)




Button().grid()
The method adjusted text alignment through Checkbutton.grid().
 from tkinter import*
master=Tk()

checkbutton1=Checkbutton(master,text="C1")
checkbutton1.grid(row=1,column=0)

checkbutton2=Checkbutton(master, text="C2")
checkbutton2.grid(row=1,column=2)

checkbutton3=Checkbutton(master,text="C3")
checkbutton3.grid(row=0,column=1)

checkbutton4=Checkbutton(master,text="C4")
checkbutton4.grid(row=2,column=1)

master.mainloop()




OptionMenu()
The method returns with the creation of OptionMenu.
 from tkinter import*
master=Tk()

file=StringVar(master)
file.set("File")

optionmenu=OptionMenu(master, file,"New File", "Recent files", "Save", "Save as", "Print")
optionmenu.pack(side=LEFT)

edit=StringVar(master)
edit.set("Edit")

optionmenu=OptionMenu(master, edit,"Undu", "Redo", "Cut", "Copy", "Paste")
optionmenu.pack(side=LEFT)

master.mainloop()




Checkbox()
The code returns with the Checkbox().
from tkinter import Tk
from tkinter import Button
import tkinter


label=tkinter.Label(master, text="Python Lake: Simple Widget"). pack()
button=tkinter.Button(master, text="Submit").pack()
checkbox=tkinter.Checkbutton(master, text="CheckBox").pack()

master.mainloop()       
   




The tkinter.Entry is used to check the string characteristics through string methods.

master=Tk()
master.title("String methods")

def cap():
    try:
        c=str.capitalize(s.get())
        s.set(c)
        
        pass

def cfold():
    try:
        c=str.casefold(s.get())
        s.set(c)
        
    except ValueError:
        pass

def ifier():
    try:
        if str.isidentifier(s.get())==True:
            s.set("Yes")
        
        else:
            s.set("No")
        
    except ValueError:
        pass

def ipace():
    try:
        if str.isspace(s.get())==True:
            s.set("Yes")
        
        else:
            s.set("No")

    except ValueError:
        pass

def iric():
    try:
       if str.isnumeric(s.get())==True:
           s.set("Yes")
       else:
           s.set("No")        
                
    except ValueError:
        pass

def ower():
    try:
        if str.islower(s.get())==True:
            s.set("Yes")
        
        else:
            s.set("No")        
        
    except ValueError:
        pass

def inum():
    try:
        if str.isalnum(s.get())==True:
            s.set("Yes")
        
        else:
            s.set("No")        
    except ValueError:
        pass

def imal():
    try:
        if str.isdecimal(s.get())==True:
            s.set("Yes")
        
        else:
            s.set("No")
        
    except ValueError:
        pass

    

def igit():
    try:
        if str.isdigit(s.get())==True:
            s.set("Yes")
        
        else:
            s.set("No")
        
    except ValueError:
        pass


def clr():
    try:
        s.set("")
        
              
    except ValueError:
        pass



entry=Entry(master, textvariable=s)
entry.grid(row=0, columnspan=4, sticky=W+E)


button_capitalize=Button(master, text="capitalize", width=10, command=cap)
button_capitalize.grid(row=2, column=0)

button_casefold=Button(master, text="casefold",width=10, command=cfold)
button_casefold.grid(row=2, column=1)

button_isidentifier=Button(master, text="isidentifier",width=10,command=ifier)
button_isidentifier.grid(row=2, column=2)


button_isspace=Button(master, text="isspace",width=10, command=ipace)
button_isspace.grid(row=3, column=0)

button_endswith=Button(master, text="endswith", width=10, command=iric)
button_endswith.grid(row=3, column=1)

button_islower=Button(master, text="islower",width=10, command=ower)
button_islower.grid(row=3, column=2)



button_isalnum=Button(master, text="isalnum",width=10, command=inum)
button_isalnum.grid(row=4, column=0)

button_isdecimal=Button(master, text="isdecimal",width=10, command=imal)
button_isdecimal.grid(row=4, column=1)

button_isdigit=Button(master, text="isdigit",width=10, command=igit)
button_isdigit.grid(row=4, column=2)

button_clear=Button(master, text="Clear", command=clr )
button_clear.grid(row=5, columnspan=3,sticky=W+E)









tkinter.button(command=print1)
The button command executed the def print1.
from tkinter import*
import tkinter
    

def print1():
    tkinter.Label(master,text="Thank you").pack()

frame=tkinter.Label(master,text="Python Lake: Welcome").pack()

button=tkinter.Button(master, text="Submit", command=print1).pack()

master.mainloop()





The code create the text() through button and then destroy and created new buttom compose.
from tkinter import*
from tkinter import Text
import tkinter
    
master=tkinter.Tk()

def message():
    compose_button.destroy()

    send_message_button=tkinter.Button(master, text="Submit Message")
    send_message_button.pack()
      
    compose_text=tkinter.Text(master)
    compose_text.pack()
    


compose_button=tkinter.Button(master, text="Compose Message",command=message)
compose_button.pack()


master.mainloop()

















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