Python function eg - Day 20

this will explain how to create a funtion in python and call it,if the funtion doesnot returns any value then it will be treated as none

to view the definition of the function you can do -- ctrl + left click

  
def python_food():
    print("Spinach is good for health")

python_food()
print (python_food())

def center_text():
    width = 50
    text = 'Spinach is good for health'
    leftalignment = (width - len(text))//2
    print(' '*leftalignment,text)

center_text()
print('='*20)

def center_text1(text):
    width = 50
    leftalignment = (width - len(text))//2
    print(' '*leftalignment,text)



center_text1('Spinach is Good for Health')
center_text1('Excecise is goood for body')
center_text1('Life is worth living')
center_text1('Love yourself')
 

the below code is the text behind the print function,we can see only the basic info not the code since this is written in C-language

 
 
def print(self, *args, sep=' ', end='\n', file=None): # known special case of print
    """
    print(value, ..., sep=' ', end='\n', file=sys.stdout, flush=False)
    
    Prints the values to a stream, or to sys.stdout by default.
    Optional keyword arguments:
    file:  a file-like object (stream); defaults to the current sys.stdout.
    sep:   string inserted between values, default a space.
    end:   string appended after the last value, default a newline.
    flush: whether to forcibly flush the stream.
    """
    pass
 

Python tkinter - Calculator GUI - Day 20

this is the code for the model calculator,it is just a GUI,funtionality will be implemented in later lessons

  
import tkinter

keys = [[('C','1'),('CE','1')],
        [('7','1'),('8','1'),('9','1'),('+','1')],
        [('4','1'),('5','1'),('6','1'),('-','1')],
        [('1','1'),('2','1'),('3','1'),('*','1')],
        [('0','1'),('=','1'),('/','1')]]

mainWindowPadding = 10

mainWindow = tkinter.Tk()
mainWindow.title("Calculator")
mainWindow.geometry("800x480-8+200")
mainWindow["padx"]= mainWindowPadding

result = tkinter.Entry(mainWindow)
result.grid(row=0,column=0,sticky = 'nsew')

keypad = tkinter.Frame(mainWindow)
keypad.grid(row=1,column=0,sticky = 'nsew')

row = 0
for keyrow in keys:
    column = 0
    for key in keyrow:
        tkinter.Button(keypad,text = key[0]).grid(row=row,column=column,
columnspan = key[1],sticky ='ew')
        column+=1
    row+=1


mainWindow.update()
mainWindow.minsize(keypad.winfo_width()+mainWindowPadding,result.winfo_height()
+keypad.winfo_height())
mainWindow.maxsize(keypad.winfo_width()+50 + mainWindowPadding,result.winfo_height()+50 
+ keypad.winfo_height())
mainWindow.mainloop()
 

Python tkinter advanced gui - Day 19

#weight property ,is used so that we can decide which rows and columns should remain less expandable or minimizable when maximizing the window or shrinking it. titles buttons should have less weight where as scroll bar,list should have more weight

  
import tkinter
import os

mainwindow = tkinter.Tk()
mainwindow.title("GRID DEMO")
mainwindow.geometry('600x480-8-200')

label =tkinter.Label(mainwindow,text ='tkinter grid demo label')
label.grid(row=0,column=0,columnspan = 3)

mainwindow.columnconfigure(0,weight=1)
mainwindow.columnconfigure(1,weight=1)
mainwindow.columnconfigure(2,weight=3)
mainwindow.columnconfigure(3,weight=3)
mainwindow.columnconfigure(4,weight=3)
mainwindow.rowconfigure(0,weight=1)
mainwindow.rowconfigure(1,weight=10)
mainwindow.rowconfigure(2,weight=1)
mainwindow.rowconfigure(3,weight=3)
mainwindow.rowconfigure(4,weight=3)

filelist =tkinter.Listbox(mainwindow)
filelist.grid(row=1,column=0,sticky = 'nsew',rowspan=2)
filelist.config(border=2,relief = 'sunken')
for zone in os.listdir('/Windows/System32/drivers/'):#sample path
    filelist.insert(tkinter.END,zone)

listscroll = tkinter.Scrollbar(mainwindow,orient = tkinter.VERTICAL,command = filelist.yview)
listscroll.grid(row = 1,column=1,sticky = 'nsw',rowspan=2)
filelist['yscrollcommand']=listscroll.set

optionframe = tkinter.LabelFrame(mainwindow,text = 'File Details')
optionframe.grid(row=1,column=2,sticky ='ne')

rbvalue = tkinter.IntVar()
rbvalue.set(3)#to set the default option for radiobutton

#radio Buttons
radio1= tkinter.Radiobutton(optionframe,text = 'FileName',value =1,variable =rbvalue)
radio2= tkinter.Radiobutton(optionframe,text = 'Path',value =2,variable =rbvalue)
radio3= tkinter.Radiobutton(optionframe,text = 'TimeStamp',value =3,variable =rbvalue)
radio1.grid(row=0,column=0,sticky ='w')
radio2.grid(row=1,column=0,sticky ='w')
radio3.grid(row=2,column=0,sticky ='w')

#widget to display the result
resultLabel = tkinter.Label(mainwindow,text ="Result")
resultLabel.grid(row=2,column=2,sticky='nw')
result = tkinter.Entry(mainwindow)
result.grid(row=2,column=2,sticky='sw')

#Frame for Time Spinners
timeFrame = tkinter.LabelFrame(mainwindow,text = 'Time')
timeFrame.grid(row=3,column=0,sticky = 'new')
#Time Spinners
hourSpinner = tkinter.Spinbox(timeFrame,width=2,values = tuple(range(0,24)))
minuteSpinner = tkinter.Spinbox(timeFrame,width=2,from_=0,to=59)
secondSpinner = tkinter.Spinbox(timeFrame,width=2,values = tuple(range(0,60)))
hourSpinner.grid(row=0,column=0)
tkinter.Label(timeFrame,text=':').grid(row=0,column=1)
minuteSpinner.grid(row=0,column=2)
tkinter.Label(timeFrame,text=':').grid(row=0,column=3)
secondSpinner.grid(row=0,column=4)
timeFrame['padx']=36

#Frame for Date Spinners
dateFrame = tkinter.Frame(mainwindow)
dateFrame.grid(row=4,column=0,sticky = 'new')
#Date Labels
dayLabel = tkinter.Label(dateFrame,text='Day')
monthLabel = tkinter.Label(dateFrame,text='Month')
yearLabel = tkinter.Label(dateFrame,text='Year')
dayLabel.grid(row=0,column=0,sticky ='w')
monthLabel.grid(row=0,column=1,sticky ='w')
yearLabel.grid(row=0,column=2,sticky ='w')
#Date Spinners
daySpin = tkinter.Spinbox(dateFrame,width=5,from_=1,to=31)
monthSpin = tkinter.Spinbox(dateFrame,width=5,values=("Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"))
yearSpin = tkinter.Spinbox(dateFrame,width=5,from_=2000,to=2099)
daySpin.grid(row=1,column=0)
monthSpin.grid(row=1,column=1)
yearSpin.grid(row=1,column=2)

#buttons
okButton = tkinter.Button(mainwindow,text = 'OK')
cancelButton = tkinter.Button(mainwindow,text = 'Cancel',command = mainwindow.destroy)
okButton.grid(row=4,column=3,sticky='e')
cancelButton.grid(row=4,column=4,sticky='w')

mainwindow.mainloop()
print (rbvalue.get())#to confirm the selection of correct value in radio button
 

Python tkinter - Day 18(10 days later)

Tkinter provides classes which allow the display, positioning and control of widgets. Toplevel widgets are Tk and Toplevel. Other widgets are Frame, Label, Entry, Text, Canvas, Button, Radiobutton, Checkbutton, Scale, Listbox, Scrollbar, OptionMenu, Spinbox LabelFrame and PanedWindow.

  
import tkinter
print(tkinter.TkVersion)
print(tkinter.TclVersion)

# tkinter._test()
# or we can use the below piece of code

mainWindowvar = tkinter.Tk()

mainWindowvar.title('test')
# mainWindow.geometry('2000x2000')
#below code will specify the screen size and position of the
#new window
mainWindowvar.geometry('400x400-5-10')


# # help(tkinter)
#
# labelvar = tkinter.Label(mainWindowvar,text = "this is label")
# labelvar.pack(side = "top")
#
# canvasvar = tkinter.Canvas(mainWindowvar, relief = 'raised',borderwidth=1)
# canvasvar.pack(side='left', anchor = 'n')
# button1 = tkinter.Button(mainWindowvar,text = "button1")
# button2 = tkinter.Button(mainWindowvar,text = "button2")
# button3 = tkinter.Button(mainWindowvar,text = "button3")
# button1.pack(side ='top')
# button2.pack(side ='top')
# button3.pack(side ='top')
#
# mainWindowvar.mainloop()


# help(tkinter)

#the above code will work but to make it proper we
#can introduce frame

labelvar = tkinter.Label(mainWindowvar,text = "this is label")
labelvar.pack(side = "top")

leftframevar = tkinter.Frame(mainWindowvar)
leftframevar.pack(side='left',anchor = 'n',fill=tkinter.Y,expand =False)

canvasvar = tkinter.Canvas(leftframevar, relief = 'raised',borderwidth=1)
canvasvar.pack(side='left', anchor = 'n')

rightframevar = tkinter.Frame(mainWindowvar)
rightframevar.pack(side='right',anchor = 'n',fill=tkinter.Y,expand =True)

button1 = tkinter.Button(rightframevar,text = "button1")
button2 = tkinter.Button(rightframevar,text = "button2")
button3 = tkinter.Button(rightframevar,text = "button3")
button1.pack(side ='top')
button2.pack(side ='top')
button3.pack(side ='top')

mainWindowvar.mainloop()