Section B Programs:
1. Demonstrate usage of basic regular expression.


import re
pattern = '^a...s$'
test_string = 'abyss'
result = re.match(pattern, test_string)

if result:
  print("Search successful.")
else:
  print("Search unsuccessful.")	
str="The rain in spain"
x=re.findall("ai",str)
print(x)
str="The rain in spain"
x=re.search("\s" ,str)
print(" The first white-space character is located in position : ",x.start())
str="The rain in spain"
x=re.split("\s",str,1)
print(x)
str="The rain in spain"
x=re.sub("\s","9",str)
print(x



Demonstrate use of advanced regular expressions for - 
data validation.
# 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")

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("Return value ; ", return_value)
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)

3Demonstrate use of Dictionaries.

thisdict={ "NAME":"Vishal" ,"PLACE":"Sankeshwar" ,"USN":1711745 }
print("Dictionary Content= ",thisdict)
x=thisdict["PLACE"]
print("PLACE is ",x)
for x in thisdict:
  print(x)
print("Values in this Dictionary are: ")
for x in thisdict:
  print(thisdict[x])
print("\nBoth keys and values of the Dictionary are: ")
for x,y in thisdict.items():
  print(x,y)
print("Total items in the dictionary : ",len(thisdict))
thisdict["District"]="Belagavi"
print("\nAdded new item is = ",thisdict)
thisdict.pop("PLACE")
print("\nAfter removing the item from dictionary= ",thisdict)
del thisdict["USN"]
print("\nAfter deleting the item from dictionary= ",thisdict)
thisdict.clear()
print("\n Empty Dictionary= ",thisdict)
thisdict={ "NAME":"Vishal" ,"PLACE":"Sankeshwar" ,"USN":1711745 }
print("\nPresent directory content= ",thisdict)
mydict=thisdict.copy()
  print("\nCopy of dictionary is = ",mydict)



5. Create SQLite Database and Perform Operations on Tables.

import sqlite3
# create a connection to a Sqlite database
conn=sqlite3.connect('test.db')
# create a cursor object
cursor=conn.cursor()
# create a table
cursor.execute("create table emp1(id integer, name text)")
#insert a record into the tables
cursor.execute("insert into emp1(id,name) values(101,'Sachin T')")
cursor.execute("insert into emp1(id,name) values(102,'Rahul S')")
cursor.execute("insert into emp1(id,name) values(103,'Virat K')")
print("\nDisplaying the emp1 table")
cursor.execute("select *from emp1")
rows=cursor.fetchall()
for row in rows:
  print(row)
print("\nafter update and delete the records in the table table")
# update records in the table
cursor.execute("update emp1 set name ='Raju' where id=101")
#delete a record fro the table
cursor.execute("delete from emp1 where id=103")
print("Displaying the emp1 table")
cursor.execute("select *from emp1")
rows=cursor.fetchall()
for row in rows:
  print(row)
print("\nTable is droped...") #drop the table
cursor.execute("drop table emp1")
#commit the transaction
conn.commit()
#close the cursor and the connections
cursor.close()
conn.close()




6)	Create a GUI using Tkinter module.
import tkinter as tk
# Create a new window
window = tk.Tk()
# Set the window title
window.title("My GUI")
# Add a label to the window
label = tk.Label(window, text="This is example for label")
label.pack()	
# Add a button to the window
button = tk.Button(window, text="Click me!")
button.pack()
# Add a Checkbutton to the window
chk1 = tk.Checkbutton(window, text="Python")
chk2 = tk.Checkbutton(window, text="Java")
chk1.pack()
chk2.pack()
# Add a entrybox to the window
entry= tk.Entry(window, text="")
entry.pack()
#add a radiobutton
R1=tk.Radiobutton(window,text="Python")
R1.pack()
R2=tk.Radiobutton(window,text="Java")
R2.pack()
#listbox 
# Start the event loop
window.mainloop()


6)	Demonstrate Exceptions in Python.

try:
  print("Try block")
  a = int(input("Enter a:"))
  b = int(input("Enter b:"))
  c = a/b;
  print("a/b = %d"%c)
except ZeroDivisionError:
  print("Except zerodivision error block")
  print("Division by zero")
else:
  print("Else block")
  print("The division : ",c)
  print("No exceptions")
finally:
  print("Finaly block")
  print("out of try ,except,else & finally block")



7)	Drawing Line chart and Bar chart using Matplotlib.
Note:install matplot library
import matplotlib.pyplot as plt
#Data
x = [1, 2, 3, 4, 5]
y = [2, 4, 6, 8, 10]
# 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)
# Add labels and title
plt.xlabel('X axis label')
plt.ylabel('Y axis label')
plt.title('Bar Chart')
# Show the plot
plt.bar(x,y)
plt.show()





8)	Drawing Histogram and Pie chart using Matplotlib.
Note:install matplot library,install numpy library.
import matplotlib.pyplot as plt
import numpy as np
# Generate some random data
data = np.random.randint(0,10,100)
# Create a histogram
plt.subplot(121)
plt.hist(data, bins=20)
plt.title("Histogram of Random Data")
plt.xlabel("Value")
plt.ylabel("Frequency")
plt.subplot(122)
sizes=[30,25,20,15,10]
labels=['A','B','C','D','E']
#Create pie chart
plt.pie(sizes,labels=labels)
#Add title
plt.title("Pie chart example")
#show the plot
plt.show()


9)	Create Array using NumPy and Perform Operations on Array.
Note:install numpy library.
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)