CS122 Uoregon Final

Flashcards for the University of oregon cs122 class

Identify which of the following is NOT a Python expression.
A. n + 3
B. zip \= '97403'
C. 42
D. math.pi

B. zip \= '97403'

Identify which of the following is a valid Python floating point number.
A. 'firstName'
B. 3
C. 4.0
D. def

C. 4.0

Identify the Python integer division operator.
A. div
B. \#
C. /
D. //

C. /

Identify the invalid Python variable name.
A. _zip4
B. zip4
C. _4zip
D. 4_zip

D. 4_zip

The following Python code will error. Why?
print("Age: " + 21)
A. Print arguments must be separated by a comma
B. Print arguments must be strings
C. Print arguments must not be expressions
D. Print is not a valid Python function

B. Print arguments must be strings

Identify the name given to the Python operator that combines strings.
A. Combination operator
B. Arithmetic operator
C. Concatenation operator
D. String operator

C. Concatenation operator

Identify the Python single line comment operator.
A. \#
B. '''
C. //
D. def

A.

\#Identify the type of error encountered when a program will not execute.
A. Syntax error
B. Runtime error
C. Semantic error
D. Logic error

A. Syntax error

Identify the class or type displayed from the following Python code:
type("University of Oregon")
A. NoneType
B. str
C. int
D. float

B. str

Identify the Python reserved word used to make a function a fruitful function.
A. void
B. reserve
C. return
D. function

C. return

Identify the availability, also known as scope of a variable defined within a function.
A. Available anywhere, essentially a global variable
B. Only available within the function, essentially a local variable

B. Only available within the function, essentially a local variable

Identify the output from the following Python function.
def foo():
for i in range(4):
print(i * 2, end \= '')
A. 0123
B. 0246
C. 1234
D. 2468

B. 0246

What term is given to the act of refining your code?
A. Generalization
B. Encapsulation
C. Refactoring
D. Composition

C. Refactoring

Identify the shape drawn by the following Python code.
t.fd(100) \# Assume t is a valid Turtle object
t.lt(120)
t.fd(100)
t.lt(120)
t.fd(100)
A. Circle
B. Triangle
C. Square
D. Line

B. Triangle

What contractual term is given to a function's name, argument list, behavior, and return value (if any)?
A. Interface
B. Generalization
C. Encapsulation
D. Branch

A. Interface

Identify the value of result in the following Python statement?
result \= 5 % 2
A. 0
B. 1
C. 2
D. 5

B. 1

Identify the incorrect Python conditional syntax expression?
A. if
B. else
C. else if
D. elif

C. else if

Select the invalid Python relational operator?
A. \=
B. \==
C. !\=
D.

A. \=

Identify the output of the following Python code,
price \= 20.0
discount \= 0.2
print(price * discount \> 18.0 or price \>\= 20)
A. 18
B. 20
C. True
D. False

C. True

Identify the final value of word_cnt in the following Python code.
s \= "Peter Piper picked a peck of pickled peppers"
word_cnt \= 0
for chr in s:
if chr \== ' ':
word_cnt \= word_cnt + 1
A. 0
B. 7
C. 8
D. 10

B. 7

Identify the correct syntax to escape a single quotation mark as a special character within a Python string.
A. 'G'Day Mate!'
B. "G'Day Mate!'
C. 'G\nDay Mate!'
D. 'G\'Day Mate!'

D. 'G\'Day Mate!'

Drawing with Python Turtle Graphics always begins in the top-left corner of the drawing window.
A. True
B. False

B. False

Identify the data type returned by Python input statements.
A. float
B. integer
C. string
D. None

C. string

Python fruitful functions with multiple return statements will generate a syntax error.
A. True
B. False

B. False

Identify the name given to adding and testing small amounts of code.
A. Incremental development
B. Refactoring
C. Temporary variables
D. Dead code

A. Incremental development

Composition is most effective when utilizing encapsulation and generalization.
A. True
B. False

A. True

Boolean functions make using the relational operator comparison unnecessary.
A. True
B. False

A. True

Identify the purpose of the isinstance() Python function.
A. Exit a function
B. Test the type of a variable
C. Exit a loop
D. Reverse a string

B. Test the type of a variable

Updating variables using increment and decrement do not require variable initialization.
A. True
B. False

B. False

Identify the Python statement to immediately exit a loop.
A. exit
B. abs
C. slice
D. break

D. break

Lengthy conditional expressions may span multiple lines using parentheses.
A. True
B. False

A. True

def repeat(data, count, spacer \= '_'):
result \= ''
for i in range(count):
result \= result + data
if i < count - 1:
result \= result + spacer
return result

Identify the correct output given the following function call.
repeat('s', 3)
A. 'sss'
B. 's s s'
C. 's_s_s'
D. 's_s_s_'

C. 's_s_s'

def repeat(data, count, spacer \= '_'):
result \= ''
for i in range(count):
result \= result + data
if i < count - 1:
result \= result + spacer
return result

Identify the correct output given the following function call.
repeat('s', 1, '-')
A. 'sss'
B. 's_s_s'
C. 's-s-s'
D. 's'

D. 's'

def repeat(data, count, spacer \= '_'):
result \= ''
for i in range(count):
result \= result + data
if i < count - 1:
result \= result + spacer
return result

Identify the reason why a for loop is appropriate for the repeat() function rather than a while loop.
A. While loop does not support concatenation
B. Number of iterations is unknown
C. Number of iterations is known
D. Break statements are not allowed in functions

C. Number of iterations is known

def repeat(data, count, spacer \= '_'):
result \= ''
for i in range(count):
result \= result + data
if i < count - 1:
result \= result + spacer
return result

The empty string assignment in the repeat() function is an example of the guardian pattern.
A. True
B. False

B. False

Common Python variable name for a file input object.
A. input
B. file
C. fin
D. t

C. fin

The readline() method does NOT read any line ending characters (e.g. \n).
A. True
B. False

B. False

The strip() method removes all leading, trailing and embedded white space.
A. True
B. False

B. False

Closing a file does NOT reset the file object file pointer.
A. True
B. False

B. False

The in operator can be used to search for one string within another string
A. True
B. False

A. True

Identify the syntax to declare an empty list in Python.
A. my_list \= list("empty")
B. my_list \= []
C. my_list \= {}
D. my_list \= [:]

B. my_list \= []

Python lists are immutable.
A. True
B. False

B. False

Identify the value of the my_list variable after complete execution of the following code.
s \= "what time is it"
my_list \= s.split()
A. "what time is it"
B. ["what time is it"]
C. ["what", "time", "is", "it"]
D. ["whattimeisit"]

C. ["what", "time", "is", "it"]

Identify the term given when an algorithm is applied to each element in a sequence.
A. Map
B. Filter
C. Reduction
D. Delimiter

A. Map

Identify the correct term given to an object with more than one variable reference.
A. Use case
B. Equivalent
C. List
D. Alias

D. Alias

Identify the correct value of the variable piece in the following Python code. Hint: List slice works like string slice.
letters \= ["A", "B", "C"]
letters.append("Z")
piece \= letters[1:2]
A. ["A"]
B. ["B"]
C. ["A", "B"]
D. ["B", "C"]

B. ["B"]

The Python is operator checks for object equivalence.
A. True
B. False

B. False

Using the in operator with a file input object and a for loop is a valid substitute for readline().
A. True
B. False

A. True

A dictionary key may consist of mutable data types.
A. True
B. False

A. True

Dictionary searches take about the same amount of time regardless of the number of dictionary items.
A. True
B. False

A. True

Identify the statistical term for a collection of counters.
A. List
B. Key-value pair
C. Histogram
D. Lookup

C. Histogram

Dictionaries maintain items in sorted order.
A. True
B. False

B. False

Select the correct Boolean value of the variable result in the following code.
d \= dict(A \= 'a', B \= 'b')
result \= 'a' in d
A. True
B. False

B. False

Identify the syntax to declare an empty dictionary in Python.
A. d \= dict("empty")
B. d \= []
C. d \= {}
D. d \= [:]

C. d \= {}

Identify the value of the variable x printed after complete execution of the following code.
x \= 10
def change_global():
x \= 15
change_global()
print(x)

A. 0
B. 10
C. 15
D. None

B. 10

Identify the correct syntax to return the second dictionary value (underlined) from the following dictionary list.
t \= [{'A': 10}, {'B': 20}, {'C': 30}]
A. t['B']
B. t['B'][1]
C. t[1]['B']
D. t[2]['B']

C. t[1]['B']

A tuple is simply another term for a Python list. In other words, the terms are completely interchangeable.
A. True
B. False

B. False

Identify the correct tuple statement(s).
A. tup \= 1, 2, 3
B. tup \= (1, 2, 3)
C. tup \= ((1, 2, 3))
D. All the above

D. All the above

Identify the symbol used to indicate both gather and scatter.
A. *
B. %
C. /
D. ^

A. *

Identify the example of a tuple assignment.
A. x, y, z \= 1, 2, 3
B. quot, rem \= divmod(16, 5)
C. Neither A or B
D. Both A and B

C. Neither A or B

Identify the correct result of the following statement.
s1 \= 'abc'
s2 \= 'xyz'
list(zip(s1, s2))

A. [(0, 'a'), (1, 'b'), (2, 'c')]
B. [('a', 'x'), ('b', 'y'), ('c', 'z')]
C. 'abcxyz'
D. 'axbycz'

B. [('a', 'x'), ('b', 'y'), ('c', 'z')]

The Python raise expression will generate a runtime exception.
A. True
B. False

A. True

Identify which of the following statements is an example of functional programming within a function.
A. Modifying object variable values (e.g. lists, dictionaries) passed in as arguments
B. Modifying and returning copies of object variable values

A. Modifying object variable values (e.g. lists, dictionaries) passed in as arguments