Simple calculator using python and tkinter

 from re import sub

from tkinter import *

#creating a window

root =  Tk()

#decale the default variable

calc = ""

#definig the function

def addi():

    global calc

    calc += "+"

    pop['text'] = calc

def subi():

    global calc

    calc += "-"

    pop['text'] = calc

def divi():

    global calc

    calc += "/"

    pop['text'] = calc

def multipl():

    global calc

    calc += "*"

    pop['text'] = calc

def ze():

    global calc

    calc += "0"

    pop['text'] = calc

def on():

    global calc

    calc += "1"

    pop['text'] = calc

def tw():

    global calc

    calc += "2"

    pop['text'] = calc

def th():

    global calc

    calc += "3"

    pop['text'] = calc

def fo():

    global calc

    calc += "4"

    pop['text'] = calc

def fi():

    global calc

    calc += "5"

    pop['text'] = calc

def si():

    global calc

    calc += "6"

    pop['text'] = calc

def se():

    global calc

    calc += "7"

    pop['text'] = calc

def ei():

    global calc

    calc += "8"

    pop['text'] = calc

def ni():

    global calc

    calc += "9"

    pop['text'] = calc

def decii():

    global calc

    calc += "."

    pop["text"] = calc

def evali():

    global calc

    try:

        calc = eval(calc)

        pop["text"] = calc

        calc = ""

    except:

        pop['text'] = "AN ERROR OCCURRED"

        calc = ""

def cleari():

    global calc

    calc = ""

    pop["text"] = calc

#naming the window

root.title("A SIMPLE CALCULATOR")

#label and entry field

m = Label(root, text="CALCULATOR", font=(25))

pop = Label(root, text='', font=(50))

#operators box

adding = Button(root, text="+",height=2, width=5, command=addi)

subtracting = Button(root, text="-",height=2, width=5, command=subi)

dividing = Button(root, text="/",height=2, width=5, command=divi)

multiplying = Button(root, text="*",height=2, width=5, command=multipl)

equating = Button(root, text="=", height=10, width=13, command=evali)

#numbers

nine = Button(root, text="9", height=2, width=5, command=ni)

eight = Button(root, text="8", height=2, width=5, command=ei)

seven = Button(root, text="7", height=2, width=5, command=se)

six = Button(root, text="6", height=2, width=5, command=si)

five = Button(root, text="5", height=2, width=5, command=fi)

four = Button(root, text="4", height=2, width=5, command=fo)

three = Button(root, text="3", height=2, width=5, command=th)

two = Button(root, text="2", height=2, width=5, command=tw)

one = Button(root, text="1", height=2, width=5, command=on)

zero = Button(root, text="0", height=2, width=5, command=ze)

ccc = Button(root, text="C", height=2, width=5, command=cleari)

deci = Button(root, text=".", height=2, width=5, command=decii)

#placing on screen

m.place(x=190, y=0)

pop.place(x=100, y=30)

#placiing operators

adding.place(x=100, y=60)

subtracting.place(x=150, y=60)

dividing.place(x=200, y=60)

multiplying.place(x=250, y=60)

equating.place(x=300, y=60)

#placing digits

nine.place(x=100, y=100)

eight.place(x=150, y=100)

seven.place(x=200, y=100)

six.place(x=250, y=100)

five.place(x=100, y=140)

four.place(x=150, y=140)

three.place(x=200, y=140)

two.place(x=250, y=140)

ccc.place(x=100, y=180)

one.place(x=150, y=180)

zero.place(x=200, y=180)

deci.place(x=250, y=180)

root.resizable(False, False)

root.geometry("500x500")

root.mainloop()

Registration System

 You are making a registration form for a website.

The form has a name field, which should be more than 3 characters long.

Any name that has less than 4 characters is invalid.

Complete the code to take the name as input, and raise an exception if the name is invalid, outputting "Invalid Name". Output "Account Created" if the name is valid.

Sample Input

abc

Sample Output

Invalid Name

Shooting Game

 You are creating a shooting game!

The game has two types of enemies, aliens and monsters. You shoot the aliens using your laser, and monsters using your gun.

Each hit decreases the lives of the enemies by 1.

The given code declares a generic Enemy class, as well as the Alien and Monster classes, with their corresponding lives count.

It also defines the hit() method for the Enemy class.

You need to do the following to complete the program:

1. Inherit the Alien and Monster classes from the Enemy class.

2. Complete the while loop that continuously takes the weapon of choice from user input and call the corresponding object's hit() method.

Sample Input

laser

laser

gun

exit

Sample Output

Alien has 4 lives

Alien has 3 lives

Monster has 2 lives

Letter Counter

 Given a string as input, you need to output how many times each letter appears in the string.

You decide to store the data in a dictionary, with the letters as the keys, and the corresponding counts as the values.

Create a program to take a string as input and output a dictionary, which represents the letter count.

Sample Input

hello

Sample Output

{'h': 1, 'e': 1, 'l': 2, 'o': 1}

Fruit Bowl

 You have a bowl on your counter with an even number of pieces of fruit in it. Half of them are bananas, and the other half are apples. You need 3 apples to make a pie.

Task

Your task is to evaluate the total number of pies that you can make with the apples that are in your bowl given to total amount of fruit in the bowl.

Input Format

An integer that represents the total amount of fruit in the bowl.

Output Format

An integer representing the total number of whole apple pies that you can make.

Sample Input

26

Sample Output

4

Python as an OOPs

 For those of you who don't know, oop stands for Object-Oriented Programming. Is python an oop, and why?