Question

3.2 Write code to calculate 2 lists: listA: all prime numbers between 1 and 30. listB: first 10 numbers in the Fibonacci series. Convert these lists to sets: set and setB. Your script must then calculate and display the intersection and the difference between these sets. Answers: Intersection: Difference: 2 Write out the complete script.

Answer 1

Code:

python file name: main.py

#importing math library for sqrt() function
#importing os for file management
import math
import os

#function to check a number is prime or not
def isPrime(n):
    flag = True
    i = 2
    while i<=math.sqrt(n):
        if n % i == 0:
            flag = False
            break
        i = i + 1
    return flag

#function to write the results to the file
def writing_file():
    try:
        os.chdir(path) #changing Directory from current Directory to temp directory
    except OSError:
        print("Directory changed %s failed" %path)
    else:
        print("Directory changed %s successfully" %path)
        file1 = open("setdata.txt","w") #creating a text file setdata.txt
        #writing all the information to the file
        file1.write("Set A : ")
        file1.write(str(setA)) #to write you have to convert the set to string using set function
        file1.write("\n")
        file1.write("Set B : ")
        file1.write(str(setB))
        file1.write("\n")
        file1.write("Intersection of setA and setB :")
        file1.write(str(res1))
        file1.write("\n")
        file1.write("Difference of setA and setB : ")
        file1.write(str(res2))
        file1.write("\n")
        file1.write("Difference of setB and setA : ")
        file1.write(str(res3))
        print("Successfully write all the result to the text file")
    

#creating empty lists to store prime numbers and fibonacci numbers 
listA = []
listB = []

for i in range(2,30):
    if isPrime(i):
        listA.append(i) #appending each number to the list when it is a prime number
   
a = 0
b = 1
sums = 0
count = 1
while count<= 10:
    listB.append(sums) #appending fibonacci numbers to the list
    count += 1
    a = b
    b = sums
    sums = a + b
    
setA = set(listA) #converting list to set by using set() function
setB = set(listB)

res1 = setA.intersection(setB) #intersection function is used to store intersection of two sets
res2 = setA.difference(setB) #difference function is used to store the difference of two sets 
res3 = setB.difference(setA)
print("setA :",setA)
print("setB :",setB)
print("Intersection of setA and setB: ",res1)
print("Difference of setA and setB: ",res2)
print("Difference of setB and setA: ",res3)
c_path = os.getcwd() #storing current path to the c_path variable
path = os.path.join(c_path,'temp') #appending temp folder name to current path 
try:
    os.mkdir(path) #creating temp folder
except OSError:
    print("Creation of the directory %s failed" % path)
    print("The directory may exist!!!")
    writing_file() #calling writing_file() function to write in the file
else:
    print("Successfully created the directory %s" %path)
    writing_file() #calling writing_file() function to write in the file
    

output:

setA : {2, 3, 5, 7, 11, 13, 17, 19, 23, 29} setB : {0, 1, 2, 3, 34, 5, 8, 13, 21} Intersection of setA and setB: {13, 2, 3, 5} Difference of setA and setB: {7, 11, 17, 19, 23, 29} Difference of sets and setA: {0, 1, 34, 8, 21} Creation of the directory C:\Users\rahul\Desktop\python\temp failed The directory may exist!!! Directory changed C:\Users\rahul\Desktop\python\temp successfully Successfully write all the result to the text file >>> |

This PC > Desktop python > temp Name Date modified Type Size setdata 31-07-2020 18:59 Text Document 1 KB setdata - Notepad File Edit Format View Help Set A : {2, 3, 5, 7, 11, 13, 17, 19, 23, 29} Set B : {0, 1, 2, 3, 34, 5, 8, 13, 21} Intersection of sets and setB : {13, 2, 3, 5} Difference of seta and setB : {7, 11, 17, 19, 23, 29} Difference of sets and setA : {0, 1, 34, 8, 21}