WGU C173: Scripting and Programming
Foundations |OA | Objective Assessment
- - ANS-subtract
* - ANS-multiply
/ - ANS-divide
% - ANS-Modulos, does division and returns the remainder
+ - ANS-concatenate or add
< - ANS-less than
<= - ANS-less than or equal to
= - ANS-assignment
== - ANS-comparisons equality
> - ANS-greater than
>= - ANS-greater than or equal to
Boolean is a true or false value - ANS-example: myVar = True
How are buckets used in a hash table? What effect do they have on lookup speed? -
ANS-Entries in a hash table are mapped to a number, which is the position in the index
where you should look for the entry. A hash table has numbered bucket slots that hold
entries. The entries are organized in the buckets based on their assigned keyword
number. When you run a search using a hash table the keyword assigned will be used
to determine which bucket the entry should be located in and begin the search there.
Because the search knows where to begin looking it is much quicker to look up items.
How are compound mathematical expressions evaluated in Python? - ANS-First
perform calculations within parentheses.
Next work left to right and perform all multiplication and division.
Finally, work left to right and perform all addition and subtraction
How are elements in a list indexed? - ANS-List elements are assigned an index number
starting with 0.
, How do you change the value of a variable with Python? - ANS-Using the = character to
assign a new value
x=6
x=9
print x # would print out 9
How do you define outputs for a function? - ANS-Using the return keyword you can
define what data will be returned or output when the procedure or function runs. You
can only access data from within a function if you return that specific data to be used
outside of the function.
How do you prioritize case (best case, worst case, average case) when analyzing
algorithms? - ANS-You would look at them in this order: Worst case, average case, best
case. The worst case is the most important because this will give you a better
understanding of why the time scales as it does.
How do you select a sub-sequence of a list with Python? - ANS-You specify the index
position to begin the selection and the index position by which to stop the selection. For
example, the following code would print red and yellow because they are at position 0
and 1.The value of 2 tells us to stop the selection at position 2, but not to include it.
myColors = ["red","yellow","blue","orange","green"]
print myColors[0:2]
How do you update a list item with Python? - ANS-By specifying the element that you
want to update and then assigning a new value. For example, the following code would
change the second element in list, from yellow to purple.
myColors = ["red","yellow","blue","orange","green"]
myColors[1] = "purple"
print myColors
How do you use dot notation to access an attribute of a class? - ANS-You list the
individual object's name that is an instance of the class, a dot, and then the attribute
name. For example myClass.color would access the color associated with the object
myClass.
How does the AND operator evaluate two operands? - ANS-If <Expression1> has a
False value, the result is False and <Expression2> is not evaluated (so even if it would
produce an error it does not matter). If <Expression1> has a True value, the result of the
and is the value of <Expression2>.
How does the OR operator evaluate two operands? - ANS-If <Expression1> has a True
value, the result is True and <Expression2> is not evaluated (so even if it would
produce an error it does not matter). If <Expression1> has a False value, the result of
the or is the value of <Expression2>.
Foundations |OA | Objective Assessment
- - ANS-subtract
* - ANS-multiply
/ - ANS-divide
% - ANS-Modulos, does division and returns the remainder
+ - ANS-concatenate or add
< - ANS-less than
<= - ANS-less than or equal to
= - ANS-assignment
== - ANS-comparisons equality
> - ANS-greater than
>= - ANS-greater than or equal to
Boolean is a true or false value - ANS-example: myVar = True
How are buckets used in a hash table? What effect do they have on lookup speed? -
ANS-Entries in a hash table are mapped to a number, which is the position in the index
where you should look for the entry. A hash table has numbered bucket slots that hold
entries. The entries are organized in the buckets based on their assigned keyword
number. When you run a search using a hash table the keyword assigned will be used
to determine which bucket the entry should be located in and begin the search there.
Because the search knows where to begin looking it is much quicker to look up items.
How are compound mathematical expressions evaluated in Python? - ANS-First
perform calculations within parentheses.
Next work left to right and perform all multiplication and division.
Finally, work left to right and perform all addition and subtraction
How are elements in a list indexed? - ANS-List elements are assigned an index number
starting with 0.
, How do you change the value of a variable with Python? - ANS-Using the = character to
assign a new value
x=6
x=9
print x # would print out 9
How do you define outputs for a function? - ANS-Using the return keyword you can
define what data will be returned or output when the procedure or function runs. You
can only access data from within a function if you return that specific data to be used
outside of the function.
How do you prioritize case (best case, worst case, average case) when analyzing
algorithms? - ANS-You would look at them in this order: Worst case, average case, best
case. The worst case is the most important because this will give you a better
understanding of why the time scales as it does.
How do you select a sub-sequence of a list with Python? - ANS-You specify the index
position to begin the selection and the index position by which to stop the selection. For
example, the following code would print red and yellow because they are at position 0
and 1.The value of 2 tells us to stop the selection at position 2, but not to include it.
myColors = ["red","yellow","blue","orange","green"]
print myColors[0:2]
How do you update a list item with Python? - ANS-By specifying the element that you
want to update and then assigning a new value. For example, the following code would
change the second element in list, from yellow to purple.
myColors = ["red","yellow","blue","orange","green"]
myColors[1] = "purple"
print myColors
How do you use dot notation to access an attribute of a class? - ANS-You list the
individual object's name that is an instance of the class, a dot, and then the attribute
name. For example myClass.color would access the color associated with the object
myClass.
How does the AND operator evaluate two operands? - ANS-If <Expression1> has a
False value, the result is False and <Expression2> is not evaluated (so even if it would
produce an error it does not matter). If <Expression1> has a True value, the result of the
and is the value of <Expression2>.
How does the OR operator evaluate two operands? - ANS-If <Expression1> has a True
value, the result is True and <Expression2> is not evaluated (so even if it would
produce an error it does not matter). If <Expression1> has a False value, the result of
the or is the value of <Expression2>.
