Scripting and Programming - Foundations - C173
questions with verified answers
- 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
questions with verified answers
- 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
