Scripting II Final

Which mode specifier will open a file but will not let you change the file or write to it? r "r" 'r' read mode read

'r'

What method or operator can be used to concatenate lists? join * lists can not be concatenated % + None of these concat

+

What is the output of the following code? myList=['a','b','c','d','e'] z = 1 for x in range(5): word=myList[x] print(str(z),word,end="") z+=1 a1 b2 c3 d4 e5 aa bb cc dd ee 1 a2 b3 c4 d5 e 1a This code produces no output This code produces an error

1 a2 b3 c4 d5 e

What is the output of the following code? colors={'red':'angry','blue':'warm'} a,b=colors.popitem() print(a) Either red or blue could be output. An error is generated in the second line of code. blue An error is generated in the first line of code. None of these. warm red angry

Either red or blue could be output.

Lists are mutable and strings are immutable. True False

True

After Python runs the following statement, what does x contain? x = open("numbers.txt", "r") a boolean none of these a series of integers a file object a string

a file object

What is the output of the following code? list1=['h','e','l','l','o'] list1.sort() print(list1[0]) e This code produces no output h Hello None of these This code causes an error H

e

Which method would you use to return all the keys in a dictionary and their associated values as a list of tuples? None of these. get keys items list pop

items

In a dictionary, you use a(n) _____ to locate a specific value. None of these. datum element item key

key

n a dictionary, you use a(n) _____ to locate a specific value. datum vector key item None of these. element

key

An element in a dictionary has two parts. What are they called? counter and accumulator key and value field and record key and item key and element

key and value

Which function would you use to get the number of elements in a dictionary? size len max_num There is no function that does this. clear sizeof

len

A(n)__________ is a function that belongs to an object, and performs some operation using that object. handler reference class method object

method

Given a valid file that contains multiple lines of data, what is the output of the following code: f=open("names.txt","w") print(f) The letter "f" is printed. Only the first line of the file is printed None of these The contents of the entire file are printed

none of these

What is the output of the following code? list1 = [1, 2, 3, 4] list1[3] = 10 print(list1) [10] None of these [1, 10, 10, 10] [1, 2, 3, 4] [1, 2, 10, 4] This code causes an error [list1]

none of these

What is the output of the following code? list1=[1,2,3] list2=list1 list1[1]=7 print(list2) 'list1' [7,7,7] 7 This code produces no output [1,2,3] This code produces an error None of these

none of these

What is the output of the following code? val1={'small':[1,2,3],'large':[64,87,92]} x=val1.get('medium','gigantic') print(x) None of these. An error is generated in the first line of code. [64,87,92] [1,2,3] An error is generated in the second line of code. x

none of these

What will the following code display? numbers = [1, 2, 3, 4, 5] print(numbers[-2]) None of these -2 2 [-2] 1 3

none of these

Which of the following is used to add a new item to a dictionary? append concat add None of these +

none of these

Before a file can be used by a program, it must be _________. formatted encrypted closed opened

opened

When an exception is generated, it is said to have been. . . caught raised killed built

raised

A(n) ______ is a complete set of data about an item, usually a line of data in an input file. record extension field method mode

record

Which method could be used to strip specific characters from just the end of a string? estrip() rstrip() remove() lstrip() strip()

rstrip()

Closing a file disconnects the communication between the file and the program. True False

true

Dictionaries are mutable types. True False

true

Strings can be written directly to a file with the write method, but integer data types must always be converted to strings before they can be written to a file. True False

true

The following code could potentially raise a ZeroDivisionError. f=open("names.txt", 'r') for x in f: print(5/int(x.rstrip())) True False

true

The following code could potentially raise an IOError. f=open("names.txt", 'r') for x in f: print(5/int(x.rstrip())) True False

true

Using recursion almost always requires more memory to be used than using a more simple loop (such as a while loop or for loop). True False

true

The ________________ is one or more statements grouped together with the anticipation that they could potentially raise an exception. error portion try block record binary section except block

try block

To respond to errors, what kind of a statement must be used? try/handle attempt/except run/handle try/except

try/except

To respond to errors, what kind of a statement must be used? run/handle try/handle try/except attempt/except

try/except

Which of these is not a valid file mode when opening a file in Python? "t" "r" "a" "w" they are all valid

"a"

Which of these is not a valid file mode when opening a file in Python? "a" "f" "w" "r"

"f"

Which mode specifier will erase the contents of a file if it already exists and create it if it does not exist? 'w' write mode write "w" w

'w'

At the end of the following program, how many elements would the dictionary, names, contain? names={'Smith':'Bob','Jones':'Emily'} names['Smith']='George' print(names) An error is generated in the second line of code. 2 None of these 3 0 An error is generated in the first line of code.

2

What is the output of the following code? count=0 list1=[0]*2 for item in list1: if item==0: count+=1 print(count) 1 [0,1] [0,0] This code produces an error This code produce no output None of these 0 2

2

What is the output of the following code? person=["Jane",485,329] print(person[1]) Jane There is no output 329 None of these 485 This code causes an error

485

What is the output of the following code? height=[72, 84, 67, 74] print(max(height)) There is no output None of these 84 This code produces an error 72

84

What is the output of the following code? nums={[2,4,6]:'evens',[1,3,5]:'odds'} print(nums[[2,4,6]]) 'evens' 'odds' An error is generated in the second line of code. evens An error is generated in the first line of code. None of these. odds

An error is generated in the first line of code.

Given that there is a large list and a large dictionary containing the same amount of data, when the programmer attempts to retrieve a particular piece of data from each structure, which of these statements is true? -Any speed difference will depend largely on the type of data stored, sometimes a list will be faster, sometimes a dictionary will be faster. -The two structures will retrieve the data at similar speeds. - Data in the dictionary can be retrieved faster than in the list. -Data in the list can be retrieved faster than in the dictionary.

Data in the dictionary can be retrieved faster than in the list.

Which of these is associated with a specific file, and provides a way for the program to work with that file? File object List Extension None of these File constant

File object

Given that "List1" is a valid list containing multiple items, which line of code correctly references the first item in the list? List1[-1] List1 List1.first() List1(-1) List1(0) List1[0] List1(1) List1[1]

List1[0]

What is the number of the first index in a dictionary? 'A' Size of the dictionary minus one. 1 0 None of these. -1

None of these.

Which of these causes an IOError? Attempting to divide by 0. Converting an incompatible string to an integer type. An incorrectly formed input statement. None of these Attempting to input a float value. Opening a file that doesn't exist.

Opening a file that doesn't exist

Which of these causes an IOError? Attempting to input a float value. Opening a file that doesn't exist. Converting an incompatible string to an integer type. Attempting to divide by 0.

Opening a file that doesn't exist

What is the output of the following code? count=0 days=['Monday','Tuesday','Wednesday','Thursday','Friday'] for a in days: if count==2: print("Results:",end="") for b in range(2): print(a,end="") count+=1 Results: Tuesday Tuesday Results: a a a Results: This code produces an error This code produces no output Results:WednesdayWednesday

Results:WednesdayWednesday

What does the get method do if the specified key is not found in the dictionary? You do not specify a key for the get method None of theses. Throws an exception Returns an empty string Nothing Returns a default value

Returns a default value

You used the following statement to create a dictionary: relationships = {'Jimmy':'brother'}. You then executed the following code, and received a KeyError exception. What is the reason for the exception? print(relationships['jimmy']) String comparisons are case sensitive so 'jimmy' does not equal 'Jimmy'. You used the wrong syntax for creating the dictionary. None of these. There is a bug in Python. You should have used the code: relationships['brother']

String comparisons are case sensitive so 'jimmy' does not equal 'Jimmy'.

What is needed to delete a single line from a file? The delete() method The remove() method The creation of a new file The overwrite() method

The creation of a new file

What is the first line of output of the following code? stuff = {1:'aaa', 2:'bbb', 3:'ccc'} for k in stuff: print(k) 1 2 The first line could be 1, 2, or 3. 3

The first line could be 1, 2, or 3.

Given a valid file containing multiple lines of data, what does the print() statement print out the first time that it is called: f=open("data.txt","r") for line in f: line=f.readline() print(line) f.close() The first word in the file This program causes an error None of these The first line of the file The second line of the file The entire contents of the file

The second line of the file

What is the output of the following code? try: x = float('abc123') print('The conversion is complete.') except IOError: print('This code caused an IOError.') except ValueError: print('This code caused a ValueError.') abc123 The conversion is complete. This code caused a ValueError. This code caused an IOError.

This code caused a ValueError.

What is the output of the following code? list1=['a','b','c'] list1.remove(1) print(list1) ['b','c'] None of these ['a','b'] This code causes an error ['a','c']

This code causes an error

What is the output of the following code? d={0:'a',1:'b',2:'c'} print(d[-1]) 2:'c' This code causes an error. None of these. c -1 2

This code causes an error.

What would be the result of the following code? ages = {'Aaron' : 6, 'Kelly' : 3, 'Abigail' : 1 } value = ages[1] print(value) Aaron 6 {'Kelly':3} Kelly None of these. This code generates an error 3

This code generates an error

What is the output of the following code? list1=[] list1+=4 print(list1) []4 None of these This code produces an error 4 [4]

This code produces an error

What is the output of the following code? list1=[] list1[1]='hello' print(list1[1][0]) ['h'] hello This code produces an error None of these h ['hello']

This code produces an error

What is the output of the following code? a = '03/07/2014' b = a.split('/') print(b) ['3', '/', '7', '/', '2014'] This code produces no output This code produces an error ['03', '07', '2014'] ['3', '7', '2014'] ['03', '/', '07', '/', '2014']

['03', '07', '2014']

What is the output of the following code? school = ['primary','secondary',['college','university']] print(school[2]) primary secondary college This code causes an error None of these university This code produces no output ['college', 'university']

['college', 'university']

What is the output of the following code? number = [0,1,2,3,4] print(number[:]) None of these This code causes an error [0, 1, 2, 3] [1, 2, 3, 4] [1, 2, 3] [0, 1, 2, 3, 4]

[0, 1, 2, 3, 4]

What will the following code display? numbers = [1, 2, 3, 4, 5] numbers[2]=99 print(numbers) [1, 2, 3, 4, 5] [1, 2, 99, 3, 4, 5] [1, 99, 2, 3, 4, 5] This code causes an error [1, 2, 99, 4, 5]

[1, 2, 99, 4, 5]

What will the following code display? numbers = [10] * 5 print(numbers) [5, 5, 5, 5, 5, 5, 5, 5, 5, 5] This code causes an error None of these [10, 10, 10, 10, 10] [50] [10],[10],[10],[10],[10]

[10, 10, 10, 10, 10]

What will the following code display? numbers = [1, 2, 3, 4, 5] my_list = numbers[1:3] print(my_list) [2, 3, 4] [1, 2, 3] None of these [2,3,4,5] [2, 3]

[2, 3]

What is the output of the following code? x=[2] y=[7] z=x+y print(z) None of these [2][7] This code produces an error [9] 9 [2, 7] [27]

[2, 7]

What will the following code display? numbers = [1, 2, 3, 4, 5] my_list = numbers[-3:] print(my_list) None of these [3] [5, 4, 3] [3, 2, 1] [3, 4, 5] This code causes an error

[3, 4, 5]

list1=[6,4,65,7,12] print(list1[-2:]) [7, 12] This code produces an error [7, 12, , ] None of these [65, 7, 12] This code produces no output

[7, 12]

Given that the file is valid and contains numbers, what does x contain after the following statement? x = open("numbers.txt", "r") a boolean a series of integers This statement contains an error. a string a file object

a file object

When a file is opened in this mode, data will be written at the end of the file's existing contents. append mode backup mode read-only mode addition mode output mode

append mode

This list method adds an item to the end of an existing list. add() increase() append() add_to() None of these() concat()

append()

When a file is first open successfully, where is the read position indicator? At the end of the file It needs to be assigned by the programmer first At the end of the first line of the file At the beginning of the file

at the beginning of the file

The part of a problem that can be solved without recursion is called the _____ case. solvable known iterative base

base

This is a small "holding section" in memory that many systems write data to before writing the data to a file. encrypted zone variable buffer delimiter access

buffer

A recursive function _______. calls itself can only be called once abnormally halts the program calls a different function

calls itself

What is the output of the following code? stuff = {2:'aaa', 7:'bbb', 1:'ccc'} print(stuff[1]) ccc This code produces an index error 1:'ccc' This code produces a syntax error

ccc

Assume that there is a variable named customer that references a file object. How would you write the string 'Mary Smith' to the file? customer.input('Mary Smith') customer.write('w','Mary Smith') customer.file.write('Mary Smith') customer.write('Mary Smith')

customer.write('Mary Smith')

Which statement could you use to remove an existing key-value pair from a dictionary? None of these. del unpair remove

del

What would you use if an element is to be removed from a specific index number? del function remove method None of these Lists don't allow you to remove an element by using an index number slice method index method

del function

This is a section of code that gracefully responds to exceptions. exception monitor exception handler exception generator exception manipulator

exception handler

Each value in a dictionary must be unique. True False

false

When opening a file in write mode, if a file with the specified name already exists, a warning message is generated. True False

false

This is a single piece of data within a record. delimiter field subrecord variable

field

Which keyword is required to reference another module (another python source file) in a python program? include add reference import

import

In order to avoid KeyError exceptions, you can check whether a key is in the dictionary using the _____ operator. included of in None of these. key

in

This is a number that identifies the location of an item in a list. bookmark index address identifier

index

What method can be used to place an item in the list at a specific index? place insert add index None of these append

insert

This function returns the numbers of items in a list. length() len() lengthof() num_items() list.size() size()

len()

Which of the following statements will convert the values in a tuple named tuple1 to the values in a list named list1. list1=tuple1.list() None of these. list1=[tuple1] list1=list(tuple1) list(tuple1)

list1=list(tuple1)

Which of the following statements is true? None of these both lists and strings are immutable lists are mutable; strings are immutable lists are immutable; strings are mutable both lists and strings are mutable

lists are mutable; strings are immutable

Which statement would produce the value of the number of items in the list, list1? items in list1 sizeof(list1) list1+1 list1.index() None of these list1.size()

none of these

n Python, before information can be read in from a file, it must be _________. closed sliced encrypted opened sorted

opened

Which method would you use to return the value associated with a specified key and remove that key-value pair from the dictionary? pop list popitem None of these. values get items

pop

Given the following list, which statement will print out the character h? list1=[['ab','cd'],['ef','gh'],['ij','kl']] print(list.index(1,1,1)) print(list1[1][1][1]) print(list1[1][1]) There is an error in the list declaration print(list1[2][2][2]) None of these print(list1[2][2]) print(list.index(2,2,2))

print(list1[1][1][1])

f a file has been opened properly, which method will return the file's entire contents as a string? readline() read() input() write() get()

read()

What do you call the process of retrieving data from a file? Inputing Outputing Reading Handling Writing

reading

What is the output of the following code? list1=['a','b','c'] print(list1[3]) c None of these abc This code produces an error b a

this code produces an error

A dictionary can include the same value several times. True False

true

A file can safely be opened and closed multiple times within the same program. True False

true

A for loop that reads in lines from a file automatically stops when it reaches the end of the file, whereas the readline() method requires you to check for an empty string to signal the end of the file. True False

true

A module is a file that contains Python code. True False

true

All members of a set must be unique. True False

true

You write this statement to respond to exceptions. try/handle attempt/except try/except run/handle

try/except

The items method of a dictionary returns what type of value? int dictionary tuple None of these. list

tuple

When a file is opened in this mode, data will be written at the end of the file's existing contents. read-only mode write mode backup mode output mode append mode

write mode

What is the output of the following code? nums=[2,5,3,7] if 5 in nums: print('Yes') else: print('No') 5 Yes This code produces an error No None of these

yes

What is the correct syntax for creating a dictionary of month names to be accessed by month numbers (only the first three months are given)? [ 1 : 'January', 2 : 'February', 3 : 'March' ] { 1, 2, 3 : 'January', 'February', 'March' } { 1 : 'January', 2 : 'February', 3 : 'March' } {' ','January','February','March'} { 1 ; 'January', 2 ; 'February', 3 ; 'March' }

{ 1 : 'January', 2 : 'February', 3 : 'March' }

What is the output of the following code? phones = {'John': '5555555', 'Julie' : '7777777'} phones['John'] = '1234567' print(phones) {'John': '5555555', 'Julie': '7777777', 'John': '1234567'} None of these. {'John': '1234567' } This code generates and error. {'John': '5555555', 'Julie': '7777777'} {'John': '1234567', 'Julie': '7777777'}

{'John': '1234567', 'Julie': '7777777