Object oriented programming contd..
Movie ticketing system (rough design)
- Classes:
- Movie
- Theatre
- Screen
- Screening
- Seat
- Booking
- Payment
- Refer Here for rough implementation Refer Here
Public and private in python
- Python doesnot support public and private specifically but there are conventions
- any member of method with a name starting from
_ is generally considered private
- If you want users not to access private give the name starting from
__ (double underscore)
Application Types
- Command line applications
- Desktop/Thick client applications (We are not covering this)
- Web applications (We are not covering this)
- Web apis
Command Line Application
Hello cli
- Write a program to say hello by taking only one argument from command line
Add cli
- Write a program to add two numbers
python add.py 1 2
1 + 2 = 3
Some command line examples
ansible-playbook --inventory hosts test.yaml
# keyword arguments
add --number1 10 --number2 20
# positional arguments
add 10 20
Commandline Password Manager
- User should be passing digits
- Version 1: Generate password
pmanager --length 16
- Version 2: Give user some options for including special characters
pmanager --length 16 --include-special "@*_#"
- Version 3: Give option for user to generate password and provide save and service name
pmanager generate --service gmail --length 12 --include-special "@&"
- Version 4: Start saving passwords to a text file
pmanager generate --service gmail --length 12 --include-special "@&"
pmanager retrieve --service gmail
- Version 5: Save passwords to an encrypted file
pmanager generate --service gmail --length 12 --include-special "@&" --secret "india123"
pmanager retrieve --service gmail --secret "india123"
Exercise
- Try going through the following
- Argument Parser
- Read, Write, append files in python
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