To Lecture Notes

IT 212 -- Sep 9, 2020

About IT 212

• Course title of IT 212 is Applied Object Oriented Programming.
• Python is the programming language for this course. Python scripts must be submitted for projects.
• This course discusses how to create, test, and use classes and objects in a variety of settings.
• This class will mainly use Python but will introduce Java at the end.
• Assumes prereq of IT 211 or knowledge of Python equivalent to a first programming course.
• You are overqualified for IT 212 if you have already taken two or more quarters of an object oriented programming language, such as CSC 241 and CSC 242.
• Learning to program is like learning to play piano. You must practice to become proficient.
• To complete the projects and to study for IT 212 exams, first make sure that you understand the example scripts.
• There are three main reasons that students do not do well in IT 212:
  
  1. Not studying enough.
     Study at least four hours per week in addition to attending or watching the lectures.
  2. Starting work on projects too late.
     Start working on a project at least one week before it is due.
  3. Not asking for help when needed.
     However, don't work more than one or two hours on a project before asking for help on it.

Course Website

Announcements   Lecture Notes   Documents   Projects   Exam Info   Prof Info   Syllabus

Course Topics

1. Review of Python from IT 211
2. Binary and hex numbers
3. Bitwise operations
4. Reading from and writing to files
5. Lists of lists
6. Classes and objects
7. Dictionaries
8. Python and SQLite
9. Regular Expressions
10. Intro to Java

Review Quiz

1. Give examples of Python constants of these datatypes:
   integer (int), floating point (float), string (str), boolean (bool). Ans:
    
   

   Meaning	Datatype	Example Constants
   Integer	int	385  -47  0
   Double Precision Floating Point	float	34.87  -8.67e15 3.12e-27  0.0
   String	str	"boy"  'boy'
   Logical or Boolean	bool	True  False

   
   
2. Suppose that we have the variable assignments
   

   name = 'Larry'
   amt = 235.41
   

   The output should look like this:
   

   Larry owes me $235.41.    (*)
   

   Format the values of name and amt so that the output looks like (*). Format the output in four ways: (a) listing the values, (b) concatenating the values, (c) expression interpolation using an f-string, (d) using the string format method. Ans:
   

   # (a) Listing the items.
   # sep="" is needed so there is no space between the fields.
   print(name, " owes me $", amt, ".", sep="")
   // or
   print(name, " owes me $" + str(amt) + ".")
   
   # (b) Concatenation.
   print(str(name) + " owes me $" + str(amt) + ".")
   
   # (c) Expression interpolation with F-string
   print(f"{name} owes me ${amt}.")
   
   # (d) String format method.
   print("{0:s} owes me ${1:6.2f}".format(name, amt))
   

3. What are the rules for spelling a legal Python variable name?
   Ans: Must start with letter or underscore, and must consist of letters, digits, or underscores. A single underscore ( _ ) can actually be a Python variable name, but is not recommended.
   Instead of using underscores, Python variable names can use lower camel casing where the variable name starts with a lowercase letter each new word begins with an uppercase letter, for example: numCustomers.
   You should be consistant: either use underscore notation all the time for variable names, or use camel casing all the time.

Binary and Hex Numbers

• To understand bitwise operators, look at Examples 1, 2, 3, and 4 in Binary and Hex Numbers to see how to convert among the number types decimal, binary, and hex.
• This Binary and Hex numbers document shows how to convert (1) the binary value 00010110 to decimal and hex, (2) the decimal value 22 to binary and decimal, and (3) the hex value 1e to binary and decimal. Here is a Python script that also does these three things:
  

  # Example 1.
  # The prefix 0b designates a Python
  # binary integer constant.
  a = 0b00010110
  print("{0} {1:02x}".format(a, a))
  
  # Example 2.
  # No prefix on the 22 designates a
  # Python decimal constant.
  b = 22
  print("{0:08b} {1:02x}".format(b, b))
  
  # Example 3.
  # The 0x prefix designates a Python
  # hexadecimal (base 16) constant.
  c = 0x1e
  print("{0:08b} {1}".format(c, c))
  

• Practice Exercises:
  
  • Convert 79 and 117 to one byte binary and hex.
  • Convert 00110110 and 01101101 to hex and decimal.
  • Convert 3d and 6a to binary and decimal.
• See the Bitwise Example.

Project 1

• See this Guide to Submitting Projects.
• Look at the Project 1 Description.