This Contact Book Management project is a command-line application written in Python. It allows users to create, read, update, and delete contacts, simulating a simple contact management system. This project is an excellent way to practice basic Python skills, such as working with functions, loops, conditional statements, and dictionaries.
To get the most out of this project, you should be familiar with the following Python concepts:
By completing this project, you will:
To run this project on your machine, ensure you have Python installed. Follow these steps:
#-------------Create New Contact----------------------
def create():
while 1:
print("\n----------------------Create New Contact----------------------")
name = input("Enter Name or press 0 for exit:").lower()
if name == '0':
break
if name not in d:
mob = input("Enter Mobile Number or press 0 for exit:")
if mob == '0':
break
if mob not in list(d.values()):
d.update({name:mob})
print("Successfully added new contact")
break
else:
print('''This Mobile Number already exists''')
print("With this Name:",list(d.keys())[list(d.values()).index(mob)].title())
c = input('''Press for
(1)Update Contact
(2)Exit
''')
if c == "1":
update()
return
else: pass
else:
print('''Contact already exists''')
#--------------Search Existing Contact------------------------
def read():
print("\n----------------------Search Existing Contact----------------------")
r = input("Enter Contact Name or Contact Number:").lower()
if r.isdigit():
if r in list(d.values()):
n= list(d.keys())[list(d.values()).index(r)]
print("Contact Name:",n.title())
print("Contact Number:",r)
return n
else:
print("Number not in Contacts")
return 0
else:
if r in d:
print("Contact Name:",r.title())
print("Contact Number:",d[r])
return r
else:
print('''Contact doesn't Exist''')
return 0
#-------------Update Existing Contact------------------------
def update():
print("\n----------------------Update Existing Contact----------------------")
v = read()
if v == 0:
return
else:
n=input("Enter new Contact Name or Contact Number:").lower()
if n.isdigit():
d[v] = n
print("Contact Updated Successfully")
else:
x = d.pop(v)
print(x)
d.update({n:x})
print("Contact Updated Successfully")
#-------------Delete Existing Contact------------------------
def delete():
print("\n----------------------Delete Existing Contact----------------------")
v = read()
if v == 0:
return
else:
d.pop(v)
print("Deleted Sucessfully")
#----------------------Main Code---------------------------
print("----------------------Welcome Contact Book Management----------------------")
d = {}
while 1:
b = input('''Choose one option
(1) New Contact
(2) Search Contact
(3) Update Contact
(4) Delete Contact
(5) Exit
''')
if b == "1": create()
elif b == "2": read()
elif b == "3": update()
elif b == "4": delete()
elif b == "5":
print("Thank You!")
break
else:
print('''You Choose Incorrect Option
Please Choose Correct One''')
#-------------Create New Contact----------------------
def create():
while 1:
print("\n----------------------Create New Contact----------------------")
name = input("Enter Name or press 0 for exit:").lower()
if name == '0':
break
if name not in d:
mob = input("Enter Mobile Number or press 0 for exit:")
if mob == '0':
break
if mob not in list(d.values()):
d.update({name:mob})
print("Successfully added new contact")
break
else:
print('''This Mobile Number already exists''')
print("With this Name:",list(d.keys())[list(d.values()).index(mob)].title())
c = input('''Press for
(1)Update Contact
(2)Exit
''')
if c == "1":
update()
return
else: pass
else:
print('''Contact already exists''')
#--------------Search Existing Contact------------------------
def read():
print("\n----------------------Search Existing Contact----------------------")
r = input("Enter Contact Name or Contact Number:").lower()
if r.isdigit():
if r in list(d.values()):
n= list(d.keys())[list(d.values()).index(r)]
print("Contact Name:",n.title())
print("Contact Number:",r)
return n
else:
print("Number not in Contacts")
return 0
else:
if r in d:
print("Contact Name:",r.title())
print("Contact Number:",d[r])
return r
else:
print('''Contact doesn't Exist''')
return 0
#-------------Update Existing Contact------------------------
def update():
print("\n----------------------Update Existing Contact----------------------")
v = read()
if v == 0:
return
else:
n=input("Enter new Contact Name or Contact Number:").lower()
if n.isdigit():
d[v] = n
print("Contact Updated Successfully")
else:
x = d.pop(v)
print(x)
d.update({n:x})
print("Contact Updated Successfully")
#-------------Delete Existing Contact------------------------
def delete():
print("\n----------------------Delete Existing Contact----------------------")
v = read()
if v == 0:
return
else:
d.pop(v)
print("Deleted Sucessfully")
#----------------------Main Code---------------------------
print("----------------------Welcome Contact Book Management----------------------")
d = {}
while 1:
b = input('''Choose one option
(1) New Contact
(2) Search Contact
(3) Update Contact
(4) Delete Contact
(5) Exit
''')
if b == "1": create()
elif b == "2": read()
elif b == "3": update()
elif b == "4": delete()
elif b == "5":
print("Thank You!")
break
else:
print('''You Choose Incorrect Option
Please Choose Correct One''')
Here is a high-level pseudo code that outlines the logic of the Contact Book Management project:
sql
Initialize an empty dictionary to store contacts
Define function create():
Prompt user for contact name
If name exists, inform user and exit function
Prompt user for mobile number
If number exists, offer options to update or exit
If new contact, add to dictionary
Define function read():
Prompt user for contact name or number
If contact exists, display name and number
If not, inform user and return 0
Define function update():
Call read() to get contact
If contact found, prompt for new name or number
Update contact information
Define function delete():
Call read() to get contact
If contact found, delete from dictionary
In the main loop:
Display menu options
Prompt user for choice
Call corresponding function based on user input
If user chooses exit, break loop
Here is a high-level pseudo code that outlines the logic of the Contact Book Management project:
sql
Initialize an empty dictionary to store contacts
Define function create():
Prompt user for contact name
If name exists, inform user and exit function
Prompt user for mobile number
If number exists, offer options to update or exit
If new contact, add to dictionary
Define function read():
Prompt user for contact name or number
If contact exists, display name and number
If not, inform user and return 0
Define function update():
Call read() to get contact
If contact found, prompt for new name or number
Update contact information
Define function delete():
Call read() to get contact
If contact found, delete from dictionary
In the main loop:
Display menu options
Prompt user for choice
Call corresponding function based on user input
If user chooses exit, break loop
Challenge 1: Handling Duplicate Contacts
Solution: The code checks for existing contacts by both name and number before adding a new contact, preventing duplicates.
Challenge 2: Input Validation
Solution: The code includes checks for valid input at each step, such as ensuring names are not empty and numbers are unique.
To test this application:
Q: How do I handle empty input when adding a contact?
A: The code should include checks to ensure that neither the name nor the mobile number is left empty when creating a new contact.
Q: Can I store additional information for each contact, such as email or address?
A: Yes, you can modify the dictionary structure to store additional information. Consider using nested dictionaries where each contact’s value is another dictionary containing multiple fields.
Q: How can I make this project more advanced?
A: Consider adding features like saving the contact list to a file, sorting contacts, or implementing a graphical user interface (GUI) using libraries like Tkinter or PyQt.
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