# Program 1: Demonstrate usage of basic regular expression 
import re # Search String str="The rain in spain" x=re.findall("ai",str) print("Search of string 'ai': ",x) 
 
x=re.search("\s" ,str) print("The first white-space character is located in position : ",x.start()) 
 
x=re.split("\s",str,1) 
print("Split the string in the occurrence of first white-space:",x) 
 
x=re.sub("\s","9",str) print("Each white-space is replaced with 9 digit: ",x) 
print("----------------------------------------------") 
 
# Metacharacters x=re.findall("[a-m]",str) print("The letters in between a to m in the string:",x) 
 
x=re.findall("spain$",str) 
if(x): 
 print("\n",str, ": Yes, this string ends with 'spain' word ") else: 
 print("\n No match ") 
 
x=re.findall("^The",str) 
if(x): 
 print("\n",str,": Yes, this string starts with 'The' word") else: 
 print("\n No match") 
 
str1="The rain in spain falls mainly in the plain" x=re.findall("aix*",str1) print("\n All ai matching characters:",x) 
if(x): 
 print("Yes, there is atleast one match") else: 
 print("No match") 
 
x=re.findall("al{2}",str1) print("\n The string which contains 'all':",x) 
if(x): 
 print("Yes, there is atleast one match") else: 
 print("No match") 
 
str2="That will be 59 dollars" x=re.findall("\d",str2) print("\n Digits in the string:",x) x=re.findall("do...rs",str2) print("\n Dot metacharacter matches any character:",x) 
 
any character: ['dollars'] 
 
   
# Program 2: Demonstrate use of advanced regular expressions for data validation (Password Validation Program) 
# importing re library import re p=input("Enter your password:") x=True 
while x:     if(len(p)<6 or len(p)>20):         break     elif not re.search("[a-z]",p): 
        break 
    elif not re.search("[A-Z]",p):         break     elif not re.search("[0-9]",p): 
        break 
    elif not re.search("[$#@]",p): 
        break     elif re.search("\s",p): 
        break     else: 
        print("Valid Password")         x=False         break if x: 
    print("Invalid Password") 
           
 
 
 
   
# Program 3: Demonstrate use of List 
print("PROGRAM FOR BUILT-IN METHODS OF LIST\n "); 
animal = ['Cat','Dog','Rabbit'] 
animal.append('Cow') print("Updated animal lists : ",animal) language = [ 'Python', 'Java', 'C++', 'French', 'c'] 
return_value = language.pop(3) print("Updated List : " , language) 
vowels = [ 'e', 'a', 'u', 'o', 'i'] 
vowels.sort() print("Sorted list in Ascending : ", vowels) vowels.sort(reverse = True) print("sorted list in Descending : ",vowels) 
vowel = ['a', 'e', 'i', 'u'] 
vowel.insert(3,'o') print("Updated list : " , vowel) animal = ['cat', 'dog', 'rabbit', 'pig'] animal.remove('rabbit') print('Updated animal lists : ', animal) os= ['Window', 'MacOS', 'Linux'] 
print("Original list : ", os) os.reverse() print("Updated list : ",os) Output
PROGRAM FOR BUILT-IN METHODS OF LIST 
  
Updated animal lists :  ['Cat', 'Dog', 'Rabbit', 'Cow'] 
Updated List :  ['Python', 'Java', 'C++', 'c'] Sorted list in Ascending :  ['a', 'e', 'i', 'o', 'u'] sorted list in Descending :  ['u', 'o', 'i', 'e', 'a'] Updated list :  ['a', 'e', 'i', 'o', 'u'] 
Updated animal lists :  ['cat', 'dog', 'pig'] 
Original list :  ['Window', 'MacOS', 'Linux'] 
Updated list :  ['Linux', 'MacOS', 'Window'] 
 
           
 
  
# Program 4: Demonstrate use of Dictionaries 
thisdict={ "NAME":"Vishal" ,"PLACE":"Sankeshwar" ,"USN":1711745 } 
print("Directory Content= ",thisdict) 
x=thisdict["PLACE"] print("\n PLACE is ",x) print("\n Keys in the dictionary are:") for x in thisdict: 
 print(x) 
print("\n Values in this dictionary are: ") for x in thisdict:  print(thisdict[x]) print("\n Both keys and values of the dictionary are: ") for x,y in thisdict.items(): 
 print(x,y) print("\n Total items in the dictionary : ",len(thisdict)) thisdict["District"]="Belagavi" print("\n Added new item is = ",thisdict) thisdict.pop("PLACE") print("\n After removing the item from dictionary= ",thisdict) del thisdict["USN"] 
 
print("\n After deleting the item from dictionary= ",thisdict) thisdict.clear() print("\n Empty Dictionary= ",thisdict) 
thisdict={ "NAME":"Vishal" ,"PLACE":"Sankeshwar" ,"USN":1711745 } 
print("\n Present dictionary content= ",thisdict) mydict=thisdict.copy() print("\n Copy of dictionary is = ",mydict) 
 
 Total items in the dictionary :  3 
 Added new item is =  {'NAME': 'Vishal', 'PLACE': 'Sankeshwar', 'USN': 1711745, 'District': 'Belagavi'} 
 After removing the item from dictionary=  {'NAME': 'Vishal', 'USN': 1711745, 'District': 'Belagavi'} 
 After deleting the item from dictionary=  {'NAME': 'Vishal', 'District': 'Belagavi'}  Empty Dictionary=  {} 
 
 Present dictionary content=  {'NAME': 'Vishal', 'PLACE': 'Sankeshwar', 'USN': 1711745} 
 Copy of dictionary is =  {'NAME': 'Vishal', 'PLACE': 'Sankeshwar', 'USN': 1711745} 
 
 

# Program 7: Demonstrate Exceptions in Python 
try:  
 print("Try block:")  a = int(input("Enter a:"))  b = int(input("Enter b:"))  c = a/b;  
except ZeroDivisionError:   print("Except block:")  print("We can not divide by zero") 
else: 
 print("Else block:")  print("The division of a and b is: ",c)  print("No exceptions") 
finally: 
 print("Finally block:") 
 
print("out of try, except, else & finally block") 
 
 
 
 
  
 
 
  
 

  
 
      
# Progrm 8: Drawing Linechart and Barchart using matplotlib 
import matplotlib.pyplot as plt 
# Data 
x = [2, 3, 4, 6, 8] y = [2, 3, 4, 6, 8] # Plot the line chart plt.subplot(121) plt.plot(x, y, color='tab:red') # Add labels and title plt.title('Line Chart') plt.xlabel('X axis label') plt.ylabel('Y axis label') 
 
# Show the plot plt.subplot(122) 
 
plt.title('Bar Chart') plt.xlabel('X axis label') plt.ylabel('Y axis label') 
 
plt.bar(x, y) 
 
plt.show() 
 
 
  
 


# Program 10:Create Array using NumPy and Perform Operations on Array. 
import numpy as np # Create an array  array = np.array([4,3,2,1]) 
# Print the array print("Array elements are : ",array) # Find the minimum value in the array min_value = np.min(array) 
# Find the maximum value in the array max_value = np.max(array) # Calculate the mean of the array mean = np.mean(array) 
# Print the minimum, maximum,mean and sort values print("The minimum value is:", min_value) print("The maximum value is:", max_value) print("The mean value is:", mean) 
#Broadcasting array = array + 10 print("Add 10 to each element in the array : ",array) array = array * 2 print("Multiply each element in the array by 2 : ",array) 
#Sorting the elements of the array sort=np.sort(array) print("Sorted of array elements : ",sort) 
import pandas as pd 
#Read data form multiple sheets in an Excel file data = pd.read_excel('my.xlsx', sheet_name='persion') print("\n**Displaying Data from DataFrames**\n") 
print(data) 
print("\n**OPERATIONS ON DATAFRAMES**\n") 
print("\n1.View the first few rows of the DataFrame :") print(data.head()) print("\n2.Number of rows and columns in the DataFrame :",end="") print(data.shape) print("\n3.Filtered data(Age column<20) :") filtered_data = data[data['Age'] < 20] print(filtered_data) print("\n4.Sort DataFrame based on 'Age' col in ascending order :") sorted_data = data.sort_values(by='Age', ascending=True) print(sorted_data) print("\nProgram Closed...")