WGU C 173 Scripting and Programming -
Foundations with Complete Solutions
- - ANSWER-subtract
* - ANSWER-multiply
/ - ANSWER-divide
% - ANSWER-Modulos, does division and returns the remainder
+ - ANSWER-concatenate or add
< - ANSWER-less than
<= - ANSWER-less than or equal to
= - ANSWER-assignment
== - ANSWER-comparisons equality
> - ANSWER-greater than
>= - ANSWER-greater than or equal to
Boolean is a true or false value - ANSWER-example: myVar = True
How are buckets used in a hash table? What effect do they have on lookup speed? -
ANSWER-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? - ANSWER-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? - ANSWER-List elements are assigned an index
number starting with 0.
, How do you change the value of a variable with Python? - ANSWER-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? - ANSWER-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? - ANSWER-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? - ANSWER-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? - ANSWER-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? - ANSWER-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? - ANSWER-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? - ANSWER-If <Expression1> has a
True value, the result is True and <Expression2> is not evaluated (so even if it would
Foundations with Complete Solutions
- - ANSWER-subtract
* - ANSWER-multiply
/ - ANSWER-divide
% - ANSWER-Modulos, does division and returns the remainder
+ - ANSWER-concatenate or add
< - ANSWER-less than
<= - ANSWER-less than or equal to
= - ANSWER-assignment
== - ANSWER-comparisons equality
> - ANSWER-greater than
>= - ANSWER-greater than or equal to
Boolean is a true or false value - ANSWER-example: myVar = True
How are buckets used in a hash table? What effect do they have on lookup speed? -
ANSWER-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? - ANSWER-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? - ANSWER-List elements are assigned an index
number starting with 0.
, How do you change the value of a variable with Python? - ANSWER-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? - ANSWER-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? - ANSWER-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? - ANSWER-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? - ANSWER-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? - ANSWER-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? - ANSWER-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? - ANSWER-If <Expression1> has a
True value, the result is True and <Expression2> is not evaluated (so even if it would
