Dr R Anurekha: 2021

Function overloading in Python - Area of a shape

# Functions - Area of a shape

# Function overloading

"""

install multipledispatch as below from command prompt

pip install multipledispatch

"""

from multipledispatch import dispatch

@dispatch(int)

def fnShape(x):

print("Area of square = ",(x*x))

@dispatch(float)

def fnShape(x):

print("Area of circle = ",(3.142*x*x))

@dispatch(int,int)

def fnShape(x,y):

print("Area of rectangle = ",(x*y))

# The three function calls differ by number and datatype

fnShape(5) # int

fnShape(2.1) # float

fnShape(5,6) # int,int

Functions - factorial of a number

# Functions - factorial of a number

def fnfact(N):

if(N==0):

return 1

else:

return(N*fnfact(N-1))

Num = int(input("Enter Number : "))

print("Factorial of", Num, "is", fnfact(Num))

Star pattern

# Star Display

"""

# Read Number of lines

N = int(input("Enter an odd number : "))

print("Star pattern : ")

tmp=N//2

for n in range(1,tmp+2,1):

print(" "*(tmp-n+1),end="")

print(" * "*((2*n)-1))

for n in range(tmp,0,-1):

print(" "*(tmp-n+1),end="")

print(" * "*((2*n)-1))

Star pattern

# Star Display

"""

# Read Number of lines

N = int(input("Enter number of Lines : "))

print("Star pattern : ")

for n in range(N,0,-1):

print(" "*(N-n),end="")

print(" * "*((2*n)-1))

Star pattern

# Star Display

"""

# Read Number of lines

N = int(input("Enter number of Lines : "))

print("Star pattern : ")

for n in range(1,N+1,1):

print(" "*(N-n),end="")

print(" * "*((2*n)-1))

Star pattern

# Star Display

"""

# Read Number of lines

N = int(input("Enter number of Lines : "))

print("Star Pattern : ")

for n in range(N,0,-1):

print("* "*n)

Star pattern

# Star Display

"""

# Read Number of lines

N = int(input("Enter number of Lines : "))

print("Star Pattern : ")

for n in range(1,N+1,1):

print("* "*n)

Star patterns

# Star Display

"""

# Read Number of Rows and Columns

R = int(input("Enter number of Rows : "))

C = int(input("Enter number of Columns : "))

print("Star Display : ")

for n in range(1,R+1,1):

print("* "*C)

Star patterns

# Star Display

"""

# Read Number of Rows and Columns

R = int(input("Enter number of Rows : "))

C = int(input("Enter number of Columns : "))

print("Star Display : ")

print("* "*C)

for n in range(1,R-1,1):

print("* ",end="")

print(" "*(C-2),end="")

print("* ")

print("* "*C)

Binary squares

# Binary Display

"""

# Read Number of Rows and Columns

R = int(input("Enter number of Rows : "))

C = int(input("Enter number of Columns : "))

print("Binary Display : ")

print("0 "*C)

for n in range(1,R-1,1):

print("0 ",end="")

print("1 "*(C-2),end="")

print("0 ")

print("0 "*C)

Number Triangle

# Number Triangles

"""

# Read Number of lines

N = int(input("Enter number of Lines : "))

print("Number Triangle : ")

for n in range(1,N+1,1):

print(" "*(N-n),end="")

for k in range(1,n+1,1):

print(str(k).center(4), end="")

for k in range(n-1,0,-1):

print(str(k).center(4), end="")

print()

for n in range(1,N+1,1):

print(" "*(n),end="")

for k in range(1,N-n+1,1):

print(str(k).center(4), end="")

for k in range(N-n-1,0,-1):

print(str(k).center(4), end="")

print()

Number triangle

# Number Triangles

"""

# Read Number of lines

N = int(input("Enter number of Lines : "))

print("Number Triangle : ")

for n in range(1,N+1,1):

print(" "*(N-n),end="")

for k in range(1,n+1,1):

print(str(k).center(4), end="")

for k in range(n-1,0,-1):

print(str(k).center(4), end="")

print()

Number triangle - binary

# Binary Triangles

"""

# Read Number of lines

N = int(input("Enter number of Lines : "))

print("Binary Triangle : ")

for n in range(1,N+1,1):

i = n%2

for val in range (1,n+1,1):

print(i, end=" ")

i=(i+1)%2

print()

Number Triangles

# Number Triangles

"""

# Read Number of lines

N = int(input("Enter number of Lines : "))

print("Number Triangle : ")

i = 1

for n in range(1,N+1,1):

for val in range (1,n+1,1):

print(i, end=" ")

i+=1

print()

Number triangles

# Number Triangles

"""

# Read Number of lines

N = int(input("Enter number of Lines : "))

print("Number Triangle : ")

for n in range(1,N+1,1):

for val in range (1,n+1,1):

print(n, end=" ")

print()

Number Triangles Display

Write program to generate the following NUMBER / STAR arrangements

1. Pascal Triangle

2. Simple Number Arrangements

3. Binary Display

4. Star patterns

Number Triangles

# Number Triangles

"""

# Read Number of lines

N = int(input("Enter number of Lines : "))

print("Number Triangle : ")

for n in range(1,N+1,1):

for val in range (1,n+1,1):

print(val, end=" ")

print()

Pygame - Moving an object based on key pressed

# Moving an object based on keypress

import sys,pygame

pygame.init()

screen = pygame.display.set_mode((500, 500))

pygame.display.set_caption("Moving object")

# Moving object starting co-ordinates and size

x = 200

y = 200

width = 20

height = 20

# Moving speed

step = 5

# infinite loop

while 1:

pygame.time.delay(10)

for event in pygame.event.get():

if event.type == pygame.QUIT:

sys.exit()

# Get the keys pressed

keys = pygame.key.get_pressed()

# Left arrow key - decrement in x axis

if keys[pygame.K_LEFT]and x>0:

x-=step

# Right arrow key - increment in x axis

if keys[pygame.K_RIGHT] and x<500-width:

x += step

# Up arrow key - decrement in y axis

if keys[pygame.K_UP] and y>0:

y -= step

# Down arrow key - increment in y axis

if keys[pygame.K_DOWN] and y<500-height:

y += step

# Set screen background and Place moving object on screen

screen.fill((255, 255, 255))

pygame.draw.rect(screen, (255, 0, 0), (x, y, width, height))

# Display movement

pygame.display.update()

pygame.quit()

Pascal Triangle

# Number Triangles

# Pascals Triangle

"""

# Factorial Function

def fact(Num):

if(Num==0):

return 1

else:

return Num*fact(Num-1)

# Read Number of lines

N = int(input("Enter number of Lines : "))

print("Pascal Triangle : ")

for n in range(0,N,1):

Nr = fact(n)

# For Alignment

print(" "*(N-n),end="")

for k in range(0,n+1,1):

term = (int)(Nr/(fact(k)*fact(n-k)))

print(str(term).center(6), end="")

print()

# Output

> python PascalTriangle.py

Enter number of Lines : 10

Pascal Triangle :

Formula for calculating elements in Pascal Triangle

matplotlib bar chart

# Creating a simple barchart using matplotlib

# importing the required module

import matplotlib.pyplot as plt

# plotting the x and y axis values for two sets of data

plt.bar([1,2,3,4,5,6,7],[7.1,9.4,10.6,12.5,11.5,10.9,9.8], label="Chennai",width=.25)

plt.bar([1.25,2.25,3.25,4.25,5.25,6.25,7.25],[8.1,10.4,9.6,8.5,10.5,8.9,7.8], label="Kancheepuram",width=.25)

# Naming the axes and setting the legends

plt.legend()

plt.xlabel('Days')

plt.ylabel('Rainfall (mm)')

# Graph title

plt.title('Rainfall')

# Display the graph

plt.show()

"""

Output

"""

Matplotlib line graph

# Creating a line graph using matplotlib

"""

Before executing the program install matplotlib

open command prompt and type

pip install matplotlib

this will install all required packages

"""

# importing the required module

import matplotlib.pyplot as plt

# x axis values

x = ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec']

# corresponding y axis values

y1 = [24.3, 25.3, 27.4, 29.6, 30.8, 30.3, 30, 29.2, 28.7, 27.3, 25.7, 24.6]

y2 = [23.9, 25.8, 28.1, 28.9, 27.5, 25.2, 24.5, 24.5, 25, 24.8, 23.9, 23.2]

# Setting the width and height of graph

f = plt.figure()

f.set_figwidth(12)

f.set_figheight(4)

# plotting the points

plt.plot(x, y1, 'g', label='Chennai', linewidth=2.5)

plt.plot(x, y2, 'r', label='Coimbatore', linewidth=2.5)

# naming the x axis

plt.xlabel('Month')

# naming the y axis

plt.ylabel('Temperature')

# display legend

plt.legend()

# giving a title to my graph

plt.title('Monthly Avarage Temperature')

# function to show the plot

plt.show()

"""

Output

"""

Matplotlib example - ploting a triangle

# Creating a simple triangle using matplotlib

"""

Before executing the program install matplotlib

open command prompt and type

pip install matplotlib

this will install all required packages

"""

# importing the required module

import matplotlib.pyplot as plt

# x axis values

x = [1,2,3,1]

# corresponding y axis values

y = [2,4,1,2]

# plotting the points

plt.plot(x, y)

# naming the x axis

plt.xlabel('x - axis')

# naming the y axis

plt.ylabel('y - axis')

# giving a title to my graph

plt.title('My first Triangle!')

# function to show the plot

plt.show()

Output:

Number Patterns - squares and cubes of numbers

# Number Patterns

# Squares and cubes of Numbers

Num_of_terms = int(input("Enter number of terms : "))

val = 1

print("Number Patterns : ")

print("Squares of Numbers : ", end="")

for i in range(1,Num_of_terms+1,1):

print(i*i, end=" ")

print("\nCubes of Numbers : ", end="")

for i in range(1,Num_of_terms+1,1):

print(i*i*i, end=" ")

Number Patters - Odd Numbers

# Number Patterns

# Odd Numbers

Num_of_terms = int(input("Enter number of terms : "))

val = 1

print("Number Patterns - Odd Numbers : ")

for i in range(0,Num_of_terms,1):

print(val, end=" ")

val+=2

Number series - Fibonacci

# Number series

# Fibonacci series

print("Fibonacci series : ")

Num_of_terms = int(input("Enter number of terms : "))

f1 = -1

f2 = 1

for i in range(0,Num_of_terms,1):

term = f1+f2

print(term, end=" ")

f1 = f2

f2 = term

Exchange the values of two variables

# Exchange the values of two variables

var1 = int(input("Enter value : "))

var2 = int(input("Enter value : "))

print("Original values : ")

print("Value 1= ",var1)

print("Value 2= ",var2)

#swapping the values

var1, var2 = var2, var1

print("Swapped values : ")

print("Value 1 = ",var1)

print("Value 2 = ",var2)