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Showing posts with label PANDAS. Show all posts

Thursday, September 17, 2020

sort method over arrays in python

shape attribute over arrays in Python

python program to compare two arrays and publish the resultant summary of the comparison operation in a boolean type array

Python - use of slicing operator on string

Monday, September 14, 2020

python program to copy an array as another array using copy method

python program to copy an array as

another array using copy method

=============================

Code:

from numpy import *

a = arrange(1,6)

# this method creates a copy of array

b = a.copy()

print('Original Array',a)

print('New Array',b)

b[0]=20

print('After Modification')

print('Original Array:',a)

print('New Array:',b)

Output :

Original Array:[1,2,3,4,5]

New Array:[1,2,3,4,5]

After Modification

Original Array:[1,2,3,4,5]

New Array:[20,2,3,4,5]

What are the various functions and operators available for comparison operation over arrays in python

Question : What are the various functions and operators available for comparison operation over arrays in python ?

Logical Functions available in python for comparison

operation over arrays in python :

logical_and()

logical_or()

logical_not()

Operators available in python for comparison

operations over arrays are :

> - greater than operator

>= - greater than equal to operator

< - less than operator

<= - less than equal to operator

== - equals comparision operator

!= - not equal to operator

What are the various functions available in numpy for processing the elements of one-dimensional arrays

Question: What are the various functions available in numpy for processing the elements of one-dimensional arrays ?

The various functions available in numpy to process the elements of one-dimensional arrays are :

sin() - for finding the sine value of elements of the array
cos() - for finding out the cosine value of elements of an array
tan() - for obtaining tangent values of elements of an array
sqrt() - used for obtaining the square root values of elements of an array
pow() - used for obtaining the power values of elements of array
min() - used to obtain the minimum values of elements from an array
max() - used to obtain the maximum values of elements from an array
sort() - used to sort the elements of the array in an ascending order

Saturday, September 12, 2020

390 - python program to accept two numbers from the keyboard and find their sum

python program to accept two numbers

from the keyboard and find their sum

========================================

Code:

x = int(input('Enter first number:'))

y = int(input('Enter second number:'))

print('the sum of ',x,' and ',y,' is',x+y)

print('the sum of {} and {} is {}'.format(x,y,x+y))

Output:

Enter first number : 92

Enter second number : 88

the sum of 92 and 88 is 180

389 - Replacement field {} with the member operators

Replacement field {} with the member operators

Code-1

var1 , var2 , var3 = 11,12,13

print('variable1={0}'.format(var1))

output:

variable1 = 11

Code-2

var1 , var2 , var3 = 11,12,13

print('variable1={0},variable2={1},variable3={2}'.format(var1,var2,var3))

output:

variable1=11,variable2=12,variable3=13

Note :: In the above print statement , the values {0},{1},{2}

represent the values of var1 , var2 , var3 respectively

388 - Use of Replacement field operator {} on strings

Use of Replacement field operator {} on strings

Example - 01 :

name , age = 'Rambo',50

print('Hello {0} , your age is {1}'.format(name,age))

output:

Hello Rambo , your age is 50

Example - 02 :

name , age = 'Rambo',50

print('Hello {n}, your age is {a}'.format(n=name,a=age) )

output:

Hello Rambo, your age is 50

Example - 03 :

name , age = 'Rambo',50

print('Hello %s, your age is %.2f'%(name,age))

output:

Hello Rambo , your age is 50

387 - python program to find sum and product of two numbers

python program to find sum and product of two numbers

================================================

Code :

# find sum and product of two numbers

x = int(input('Enter first number:'))

y = int(input('Enter second number:'))

#display sum

print('The sum of {0} and {1} is {2}'.format(x,y,x+y))

#display product

print('The product of {0} and {1} and {2}'.format(x,y,x*y))

#display both sum and product

print('the sum of {0} and {1} is {2} and product of {0} and {1} is {3}'.format(x,y,x+y,x*y))

Output :

Enter first number:11
Enter second number:22
The sum of 11 and 22 is 33
The product of 11 and 22 and 242
the sum of 11 and 22 is 33 and product of 11 and 22 is 242

386 - write a program in python to display the sum of two numbers using command line arguments and not by using input function

write a program in python to display the sum of two

numbers using command line arguments

and not by using input function

==========================================

Code:

import sys

sum = int(sys.argv[1]) + int(sys.argv[2])

print("Sum of numbers:",sum)

Analysis:

Here , the arguments passed to the command line

is usually in the datatype of a string which needs

to be converted to integer type before any type of

mathematical operation could occur over the object .

So the arguments are converted to integer datatype by

using the 'int' function over the provided input . In the

program we have mentioned values as argv[1]

and argv[2] as the command line usually accepts any

type of argument first by the name of the program

which is stored in the list and can be accessed from

the list by the list's first element that is argv[0] in each

case , the subsequent arguments are stored in [1] , [2]

and so on . In our case , as we are doing an addition of

two numbers , so we will use the arguments stored at

list's [1] and [2] index , so we have used argv[1] and

argv[2] to access the elements and do the addition

operation .

385 - python program to calculate the area of a circle

python program to calculate the area of a circle

========================================

Code:

# import the math module

import math

# create a variable for radius as an input by the user

r = int(input("Enter the radius of the circle:"))

area = math.pi*r**2

print("Area of the circle:",area)

print('Area of the circle:{0.2f}'.format(area))

output:

Enter the radius of the circle :15

Area of the circle:706.5

384 - pop method upon an array in python

pop method upon an array in python

===============================

'pop' method removes the specified item from the array

and returns the array. And if no element is specified

then the last index element in the array is removed and

the array is returned .

example:

import array as ar

a = ar.array('i',[10,20,30,40,50])

a.pop(10)

a.pop()

output:

array('i',[20,30,40,50])

array('i',[20,30,40])

array('i',[20,30])

Friday, September 11, 2020

'exp' method over arrays in python

============================

method to calculate exponents over arrays in python

example:

=======

from numpy import *

arr = array([1,2,3,4])

print("Original Array:", arr)

print("Exponentiation value:", exp(arr))

Output :

=======

Original Array: [1 2 3 4]
Exponentiation value: [ 2.71828183 7.3890561 20.08553692 54.59815003]

sum method over arrays in python

============================

sum method is used over arrays in python to return the

sun of all elements in an array

example:

from numpy import *

arr = array([1,2,3,4])

print("Original Array:", arr)

print("Sum value:", sum(arr))

output:

13 - Var method over arrays in python

Var - method over arrays in python

==============================

Var method over arrays in python returns the variance

of all elements in the array

example

import numpy as np

arr = np.array([1,2,3,4,5,6])

print("Original Array:", arr)

print("Variance value:", var(arr))

output

Original Array: [1 2 3 4 5 6]
Variance value: 2.9166666666666665

Cov method over arrays in python

Cov method over arrays in python is used to find the

covariance of all elements in the array

example

from numpy import *

arr = array([1,2,3,4,5,6])

print("Original Array:", arr)

print("Covariance value:", cov(arr))

output

Original Array: [1 2 3 4 5 6]
Covariance value: 3.5

python program to accept 4 integers in the same line and display their sum

==============================================================

Code:

var1 ,var2,var3,var4 = [int(x) for x in input("Enter four numbers:").split()]

print('Sum =',var1+var2+var3+var4)

Output:

Enter four numbers: 11 12 13 14

Sum = 50

Python program to accept 3 integers separated by commas and display their sum

Python program to accept 3 integers separated by

commas and display their sum

--------------------------------------------------------------

Code:

var1 , var2 , var3 = [int(x) for x in input("Enter three numbers:").split(',')]

print('Sum = ', var1+var2+var3)

output:

Enter three numbers: 10,20,30

Sum = 60

here , all the three numbers are being received in a

single line within a list but separated from each other

by commas in-between them . Split function () is used

to isolate the numbers from each other and store them

within each variable .