Python Final
You can store a List as one of the keys of a Dictionary.
false
Label each of the following as either a "Read", a "Write", or a "Read and Write" for the variable price. price = 0 print(price) adjusted = price * tax price = price * .9
write, read, read, read and write
Which of the following is the best description of this line of code? from math import sqrt as square_root
Loads the sqrt function in the math module but renames it square_root
Which of the following can be involved in an expression? other expressions values mathematical operators variables conditional operators statements
all but statements
What types are possible subtypes for a list?
anything
How many times does the loop body below execute? command = "" words = [] while command != "quit": command = input("Give me another word:") words.append("Said "+command) print(words)
at least once
A data structure for storing elements in an ordered sequence
list
Specific instances of data written directly in source code
literal value
A sequence of coded instructions that manipulate data inside a computer
program
5
value
How do you write each of the following as string literal values? a tab character a new line a double quote a single quote
"\t" "\n" "\"" '\''
Given the following code: movies = [ {"Name": "Iron Man", "Length": 126, "Characters": ["Tony", "Pepper", "Obidiah"]}, {"Name": "Thor", "Length": 130, "Characters": ["Thor", "Jane", "Loki"]}, {"Name": "Captain America", "Length": 126, "Characters": ["Steve", "Peggy", "Bucky"]}] What is the value of the following expressions? movies[0]["Name"] movies[2]["Name"] movies[0][127] movies[1][1] movies[127]["Name"] movies[2]["Characters"][0] movies[2]["Characters"]["Steve"] movies[1]["Characters"][2] movies[2]["Steve"] movies[-1]["Length"]
"Iron Man", "Captain America", Raises an error, Raises an error, Raises my error, "Steve", Raises an error, Loki, Raises an error, 126
How many values can be used at a time with each of the following operators? + not and !=
2,1,2,2
How many branches do each of these code snippets have? ************** if conditional: print(4) print(4) ********************* if conditional: print(1) else: print(3) ***************************** if conditional1: if conditional1: 2: print(4) print(3) print(2)
2,2,3
What will be printed after this code is run? points = {"Virginia Tech": 5} points["Virginia Tech"] = 3 print(points["Virginia Tech"])
3
Which of the following two snippets of code are equal? 1. from json import load file = open("scores.txt") json.load(file) 2. import load file = open("scores.txt") load(file) 3. from json import load file = open("scores.txt") load(file) 4. import json as js file = open("scores.txt") json.load(file) 5. import json file = open("scores.txt") json.load(file)
3,5
After the second iteration of the loop, what is the value of sum? sum = 0 values = [4, 2, 6] for value in values: sum = sum + value
6
If an if statement is nested inside another if statement, how many spaces will the body of the inner if statement have?
8
What is the value of tax after this program executes? if False: tax = 5 print(tax)
No value, because an error occurs since the value has not been defined
When the following code is executed, what will be the value of the variable named greeting?
None
Histogram
The distribution of a list of numbers
scatter plot
The relationship between two lists of numbers
Line plot
The trend in a list of numbers
Which of the following demonstrates proper syntax for accessing a dictionary's value?
a_dictionary["Key"]
What does the pass do?
absolutely nothing
The input function does which of the following? consumes arguments returns a string retrieves input from the user writes output to the console
all
input
built-in function
built-in function
The print function does which of the following? consumes arguments writes output to the console returns a string retrieves input from the user
consumes arguments, writes output to the console
Given the following code, dict = {"Key": "Value", 7: 8, True: "Hello"} key = 7 Which of the following are valid expressions? dict[7] dict["Value"] dict[key] dict[8] dict[Key] dict["Key"] dict[False] dict[True] dict["He"+"llo"]
dict[7], dict[key], dict["Key"], dict[True]
A data structure for mapping keys to values
dictionary
What is the type of the iteration variable in this code? groceries = [{"Name": "Apple", "Cost": 1.99, "Calories": 20}, {"Name": "Cookie", "Cost": 4.99, "Calories": 300}, {"Name": "Steak", "Cost": 6.99, "Calories": 100}] for grocery in groceries: print(grocery)
dictionary
A for loop will process a file sentence-by-sentence.
false
A sequence of coded instructions that manipulate data inside a computer
false
A while loop will always execute at least once.
false
A while loop will execute once for each expression in the conditional.
false
Dictionaries are useful because you can have duplicate keys.
false
Dictionaries will always have at least one key and one value.
false
Every function created with the def keyword must have AT LEAST ONE parameter.
false
Normally, statements are executed from top to bottom.
false
Once a function returns a variable, that variable is available outside of the function.
false
Printing is the same thing as returning.
false
Strings are composed of only letters and symbols.
false
The body of a for loop will contain one statement for each element of the iteration list.
false
The given program correctly closes the file: def has_a_cat(filename): a_file = open(filename) return "cat" in a_file.read() a_file.close() has_a_cat("story.txt")
false
The open function consumes a String representing a path and returns a String of the file's contents.
false
The print function can only print literal values.
false
The print function is necessary to call a function.
false
The statement count = count + 1 will cause an error because no number can be greater than itself.
false
Tuples are composed of key/value pairs.
false
Variable names are important because computers understand the meaning of names and change their value accordingly.
false
Variables in Python are used to solve for unknown values, like in Algebra.
false
You can nest if statements inside of other if statements, but not inside functions.
false
You should not put error messages into help seeking emails because it can clutter up the email.
false
A sequence of data stored in your computer's long term memory
file
A control structure for performing actions on each element of a sequence
for loop
A reusable chunk of code with inputs and outputs
function
A control structure for branching the execution of a program
if statement
Is the print call before, inside, or after the for loop? for name in names: print(name)
inside
def
keyword
for
keyword
import
keyword
in
keyword
return
keyword
while
keyword
label each of the following as a function call, method call, or not a call. function.call() print() file.(close) method() "function".method() (input)
method, function, not a call, function, method, not a call
A collection of functions, classes, and variables available to be imported
module
Which of the following expressions creates two new variables?
month, year = (11, 17)
A type that represents textual data
string
Given the file named scores.txt with the following contents: 44, 23, 37 And the following python code: score_file = open("scores.txt") score_data = score_file.read() What will be the type of score_data?
string
Given this dictionary... animal = {"Name": "Pumpkin", "Age": 2, "Small?": True} ********** What is the type of the value associated with the key "Name"? *************** What is the type of the key "Name"? ************************* What is the type of the key "Small?"? ********************************** What is the type of the value associated with the key "Age"?
string, string, string, integer
Keys can be added to a dictionary after the dictionary has been created.
true
Like an if statement and a function call, the for Loop might cause the execution to not follow the sequential order of lines.
true
List comprehensions cannot express everything that a for loop can.
true
Normally, statements are executed from top to bottom.
true
The Iteration Variable will take on each value of the List Variable, one at a time.
true
Unlike Lists, Tuples are immutable, meaning Tuples cannot be changed after they are created.
true
Variables change their value over time according to the instructions in a program
true
What is the value of the variable x after this code is run? values = [-1, -2, 2, 3] x = False for value in values: x = x or value > 0 print(x)
true
You can store a Dictionary as one of the elements of a List.
true
You can store a List as one of the values of a Dictionary.
true
You must import the json module before you can use the load function.
true
What types are sequences?
tuple, dictionary, string, list, file
A categorization of values of similar kinds that determines what you can do with the values.
type
boolean
type
dictionary
type
float
type
integer
type
list
type
string
type
""
value
[1:2]
value
[]
value
true
value
A name that can be associated with a value
variable
