Unit Two Exam

\(\boxdot\) General Information

• Closed Resources

• No calculator, cell phone

• Written - no interactive programming

• 65 minutes

\(\boxdot\) Primary Topics

Selection

• unary

  if boolean_value:  
       .
       .

• binary

  if boolean_value:  
       .
       .
  else:  
       .  
       .

• chained

  if boolean_value1:  
       .
       .  
  elif boolean_value2:  
       .  
       .  
  elif boolean_value3:  
       .  
       .  
  else  (optional)  
       .  
       .  

Iteration

• for loops (definite)

  • for item in a_list:

  • for i in range(len(a_list)):

• while loops (indefinite)

  • while boolean_object:

  • sentinel values

Strings - ' ' or " "

• string traversal

• string functions, operators and methods:

  • + - concatenation operator

  • * - repetition operator

  • : - slice operator

  • <, ==, <=, >=, != - comparison operators

  • in and not in operators

  • len() function

  • strip() method

  • split() method

  • replace() method

lists [ ]

• list traversal

• list functions, operators and methods:

  • len( ) function

  • + - concatenation operator

  • * - repetition operator

  • : - slice operator

  • in and not in operators

  • append()

  • insert()

  • pop()

  • reverse()

  • index()

  • count()

  • remove()

• list comprehensions

• conversion : string \(\leftrightarrow\) list:

  s = 'abcde'
  s_l = [char for char in s]
  print(s_l)
  s_l = list(s)
  print(s_l)
  n_s = ''.join(s_l)
  print(n_s)    

tuples - ( )

• tuple management (like strings):

  • len( ) function

  • concatenation operator +

    new_tuple = old_tuple + (new_item,)

  • slice operator :

    new_tuple = old_tuple(:location) + (new_item,) + old_tuple(location+1:)

• tuples as a function return

\(\boxdot\) Types of Questions

• multiple choice and/or short answer:

  • basic mathematics binary operators and precedence

  • for and while loops

  • strings, lists and tuples

  • methods, functions and operators for strings, lists and tuples

  • accumulator pattern

  • boolean expressions using comparison operators

  • precedence : mathematical operators, relational operators, logical operators

  • selection (if, if - else, if - elif - else)

• error recognition:

  • basic syntax - when to use ( ), [ ]

  • indentation issues

  • improper use of strings, lists, and tuples (e.g. mutable versus immutable)

• code reading:

  • program flow of execution (main() and other functions)

  • accumulator pattern

  • variable values at certain locations in the code

  • function return values

  • Turtle graphics and L-systems

• code writing:

  • for and while loops

  • strings, lists and tuple

  • random module functions - random() and randrange()

  • accumulator pattern

  • boolean expressions using comparison operators

  • precedence : mathematical operators, relational operators, logical operators

  • selection (if, if - else, if - elif - else)

  • proper indentation

• not included:

  • image processing

  • Monte Carlo method material

  • 3n + 1 sequence

  • Newton’s method

  • character classification (9.19)