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Python Programming > Final Exam Prep > Flashcards

Final Exam Prep Flashcards

1
Q

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

A

read

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2
Q

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

A

write

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3
Q

Assume that there is a variable named customer that references a file object. How would you write the string ‘Mary Smith’ to the file?

A

customer.write(‘Mary Smith’)

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4
Q

If a file has been opened properly, which method will return the file’s entire contents as a string?

A

read()

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5
Q

Which method could be used to strip specific characters from just the end of a string?

A

rstrip()

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6
Q

Given that the file is valid and contains numbers, what does x contain after the following statement?

x = open(“numbers.txt”, “r”)

A

a file object

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7
Q

Which of these is not a valid file mode when opening a file in Python?

A

f

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8
Q

Before a file can be used by a program, it must be _________.

A

opened

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9
Q

This is a single piece of data within a record.

A

field

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10
Q

When a file is opened in this mode, data will be written at the end of the file’s existing contents.

A

append mode

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11
Q

To respond to errors, what kind of a statement must be used?

A

try/except

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12
Q

Which of these causes an IOError?

A

Opening a file that doesn’t exist.

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13
Q

Which of these is associated with a specific file, and provides a way for the program to work with that file?

A

File object

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14
Q

What do you call the process of retrieving data from a file?

A

Reading

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15
Q

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

A

method

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16
Q

A(n) ______ is a complete set of data about an item.

A

record

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17
Q

The ________________ is one or more statements grouped together with the anticipation that they could potentially raise an exception.

A

try block

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18
Q

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

A

False

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19
Q

Closing a file disconnects the communication between the file and the program. T/F

A

True

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20
Q

In Python, there is no way to prevent a program from crashing if it attempts to read a file that does not exist. T/F

A

False

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21
Q

Strings can be written directly to a file with the write method, but numbers must always be converted to strings before they can be written to a file. T/F

A

True

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22
Q

The while loop automatically reads a line in a file without testing for any special condition that signals the end of the file. T/F

A

False

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23
Q

A file can safely be opened and closed multiple times within the same program. T/F

A

True

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24
Q

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)

A

None of these
The contents of the entire file are printed
The letter “f” is printed.
Only the first line of the file is printed

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25
Q

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)

A

The second line of the file

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26
Q

The following code could potentially raise an IOError. T/F

f=open(“names.txt”, ‘r’)
for x in f:
print(5/x.rstrip())

A

False

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27
Q

The following code could potentially raise a ZeroDivisionError. T/F

f=open(“names.txt”, ‘r’)
for x in f:
print(5/x.rstrip())

A

True

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28
Q

When a file is first open successfully, where is the read position indicator?

A

At the beginning of the file

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29
Q

What is needed to delete a single line from a file?

A

The creation of a new file

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30
Q

This is a small “holding section” in memory that many systems write data to before writing the data to a file.

A

Buffer

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31
Q

What is the output of the following code?

number = [0,1,2,3,4]
print(number[:])

A

[0, 1, 2, 3, 4]

32
Q

What would you use if an element is to be removed from a specific index number?

A

del function

33
Q

What is the output of the following code?

list1=[]
list1[1]=’hello’
print(list1[1][0])

A

This code produces an error

34
Q

What is the output of the following code?

list1=[1,2,3]
list2=list1
list1[1]=7
print(list2)

A

None of these

'list1' 
[7,7,7] 
7
[1,2,3] 
This code produces no output 
This code produces an error
35
Q

What is the first negative index in a list?

A

-1

36
Q

What method can be used to place an item in the list at a specific index?

A

insert

37
Q

What is the output of the following code?

list1=[‘a’,’b’,’c’]
print(list1[3])

A

This code produces an error

38
Q

What is the output of the following code?

list1 = [1, 2, 3, 4]
list1[3] = 10
print(list1)

A

None of these

 [1, 10, 10, 10]
[list1]
[10]  
[1, 2, 10, 4] 
[1, 2, 3, 4] 
This code causes an error
39
Q

What method or operator can be used to concatenate lists?

A

+

40
Q

What is the ouput of the following code?

school = [‘primary’,’secondary’,[‘college’,’university’]]
print(school[2])

A

[‘college’, ‘university’]

41
Q

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
A

Results:WednesdayWednesday

42
Q

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
A

1 a2 b3 c4 d5 e

43
Q

What is the output of the following code?

count=0
list1=[0]*2
for item in list1:
  if item==0:
    count+=1
print(count)
A

2

44
Q

What is the output of the following code?

a = ‘03/07/2014’
b = a.split(‘/’)
print(b)

A

[‘03’, ‘07’, ‘2014’]

45
Q

Which statement would produce the value of the number of items in the list, list1?

A

None of these

46
Q

What is the output of the following code?

list1=[6,4,65,7,12]
print(list1[-2:])

A

[7, 12]

47
Q

Which of the following statements is true?

A

lists are mutable; strings are immutable

48
Q

What is the output of the following code?

list1=[‘a’,’b’,’c’]
list1.remove(1)
print(list1)

A

This code causes an error

49
Q

Given the following list, which statement will print out the character h?

list1=[[‘ab’,’cd’],[‘ef’,’gh’],[‘ij’,’kl’]]

A

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

50
Q

What is the output of the following code?

list1=[‘h’,’e’,’l’,’l’,’o’]
list1.sort()
print(list1[0])

A

e

51
Q

What is the output of the following code?

x=[2]
y=[7]
z=x+y
print(z)

A

[2, 7]

52
Q

What is the output of the following code?

nums=[2,5,3,7]
if 5 in nums:
    print('Yes')
else:
    print('No')
A

Yes

53
Q

What is the output of the following code?

person=[“Jane”,485,329]
print(person[1])

A

485

54
Q

What is the output of the following code?

height=[72, 84, 67, 74]
print(max(height))

A

84

55
Q

What is the output of the following code?

list1=[]
list1+=4
print(list1)

A

This code produces an error

56
Q

In a dictionary, you use a(n) _____ to locate a specific value.

A

key

57
Q

What is the correct structure for creating a dictionary of month names to be accessed by month numbers (only the first three months are given)?

A

{ 1 : ‘January’, 2 : ‘February’, 3 : ‘March’ }

58
Q

What would be the result of the following code?

ages = {‘Aaron’ : 6, ‘Kelly’ : 3, ‘Abigail’ : 1 }
value = ages[1]
print(value)

A

This code generates an error

59
Q

You created the following dictionary relationships = {‘Jimmy’:’brother’}. You then executed the following code, and received a KeyError exception. What is the reason for the exception?

relationships[‘jimmy’]

A

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

60
Q

Which statement could you use to remove an existing key-value pair from a dictionary?

A

del

61
Q

Which function would you use to get the number of elements in a dictionary?

A

len

62
Q

Which method would you use to return all the keys in a dictionary and their associated values as a list of tuples?

A

items

63
Q

What is the number of the first index in a dictionary?

A

None of these.

 'A' 
0
Size of the dictionary minus one. 
1
 -1
64
Q

Which method would you use to return the value associated with a specified key and remove that key-value pair from the dictionary?

A

pop

65
Q

The items method of a dictionary returns what type of value?

A

tuple

66
Q

What does the get method do if the specified key is not found in the dictionary?

A

Returns a default value

67
Q

In a dictionary, you use a(n) _____ to locate a specific value.

A

key

68
Q

In order to avoid KeyError exceptions, you can check whether a key is in the dictionary using the _____ operator.

A

in

69
Q

What is the output of the following code?

phones = {‘John’: ‘5555555’, ‘Julie’ : ‘7777777’}
phones[‘John’] = ‘1234567’
print(phones)

A

{‘John’: ‘1234567’, ‘Julie’: ‘7777777’}

70
Q

What is the output of the following code?

d={0:’a’,1:’b’,2:’c’}
print(d[-1])

A

This code causes an error.

71
Q

Which of the following is used to add a new item to a dictionary?

A

None of these

72
Q

A dictionary can include the same value several times.

A

True

73
Q

Which of the following statements will convert the values in a tuple named tuple1 to the values in a list named list1.

A

list1=list(tuple1)

74
Q

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?

A

Any speed difference will depend largely on the type of data stored, sometimes a list will be faster, sometimes a dictionary will be faster.

75
Q

Dictionaries are mutable types. T/F

A

True

Python Programming (1 decks)

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