Question 1

Which of the following statements a), b) or c) is false?

Accepted Answer

A)  Most resources that require explicit release, such as files, network connections and database connections, have potential exceptions associated with processing those resources. 
B)  A program that processes a file might raise IOErrors. For this reason, robust file-processing code normally appears in a try suite containing a with statement to guarantee that the resource gets released. 
C)  When a with statement is in a try suite, you can catch in except handlers any exceptions that occur and you do not need a finally clause because the with statement handles resource deallocation. 
D)  All of the above statements are true. 
A)  Most resources that require explicit release, such as files, network connections and database connections, have potential exceptions associated with processing those resources. 
B)  A program that processes a file might raise IOErrors. For this reason, robust file-processing code normally appears in a try suite containing a with statement to guarantee that the resource gets released. 
C)  When a with statement is in a try suite, you can catch in except handlers any exceptions that occur and you do not need a finally clause because the with statement handles resource deallocation. 
D)  All of the above statements are true.

Question 2

Which of the following statements a), b) or c) is false?

Accepted Answer

A)  The Python Standard Library's pickle module can serialize objects into the data formats of many popular programming languages. 
B)  Pickle has potential security issues. 
C)  If you write your own pickling and de-pickling code, pickling can be secure. 
D)  All of the above statements are true. 
A)  The Python Standard Library's pickle module can serialize objects into the data formats of many popular programming languages. 
B)  Pickle has potential security issues. 
C)  If you write your own pickling and de-pickling code, pickling can be secure. 
D)  All of the above statements are true.

Question 3

Various types of exceptions can occur when you work with files. Which of the following statements a), b) or c) is false?

Accepted Answer

A)  A FileNotFoundError occurs if you attempt to open a non-existent file for reading with the 'r' or 'r+' modes. 
B)  A PermissionsError occurs if you attempt an operation for which you do not have permission. This might occur if you try to open a file that your account is not allowed to access or create a file in a folder where your account does not have permission to write, such as where your computer's operating system is stored. 
C)  A LockedError (with the error message 'I/O operation on closed file.') occurs when you attempt to write to a file that has already been closed. 
D)  All of the above statements are true. 
A)  A FileNotFoundError occurs if you attempt to open a non-existent file for reading with the 'r' or 'r+' modes. 
B)  A PermissionsError occurs if you attempt an operation for which you do not have permission. This might occur if you try to open a file that your account is not allowed to access or create a file in a folder where your account does not have permission to write, such as where your computer's operating system is stored. 
C)  A LockedError (with the error message 'I/O operation on closed file.') occurs when you attempt to write to a file that has already been closed. 
D)  All of the above statements are true.

Question 4

The int function raises a ________ if you attempt to convert to an integer a string (like 'hello') that does not represent a number.

Accepted Answer

A)  NameError 
B)  ConversionError 
C)  ValueError 
D)  None of the above 
A)  NameError 
B)  ConversionError 
C)  ValueError 
D)  None of the above

Question 5

Which of the following statements are false?

Accepted Answer

A)  The built-in open function opens a file and associates it with a xe "file object"file object. 
B)  The mode argument specifies the file-open mode, indicating whether to open a file for reading from the file, for writing to the file or both. 
C)  The mode 'w' xe "open a file:for writing"opens the file for writing, creating the file if it does not exist. If the file already exists, opening it for writing causes any new data to be appended to the end of the file. 
D)  At the end of the with statement's suite, the with statement implicitly calls the file object's close method to close the file. 
A)  The built-in open function opens a file and associates it with a xe "file object"file object. 
B)  The mode argument specifies the file-open mode, indicating whether to open a file for reading from the file, for writing to the file or both. 
C)  The mode 'w' xe "open a file:for writing"opens the file for writing, creating the file if it does not exist. If the file already exists, opening it for writing causes any new data to be appended to the end of the file. 
D)  At the end of the with statement's suite, the with statement implicitly calls the file object's close method to close the file.

Question 6

Which of the following statements a), b) or c) is false?

Accepted Answer

A)  When the finally clause terminates, program control continues with the next statement after the try statement. In an IPython session, the next In [] prompt appears. 
B)  The following code includes a try statement in which an exception occurs in the try suite: try:
Print('try suite that raises an exception')
Int('hello')
Print('this will not execute')
Except ValueError:
Print('a ValueError occurred')
Else:
Print('else will not execute because an exception occurred')
Finally:
Print('finally always executes') 
C)  The xe "finally:clause"finally clause executes only when an exception occurs in the corresponding try suite. 
D)  All of the above statements are true. 
A)  When the finally clause terminates, program control continues with the next statement after the try statement. In an IPython session, the next In [] prompt appears. 
B)  The following code includes a try statement in which an exception occurs in the try suite: try:
Print('try suite that raises an exception')
Int('hello')
Print('this will not execute')
Except ValueError:
Print('a ValueError occurred')
Else:
Print('else will not execute because an exception occurred')
Finally:
Print('finally always executes') 
C)  The xe "finally:clause"finally clause executes only when an exception occurs in the corresponding try suite. 
D)  All of the above statements are true.

Question 7

The following code uses exception handling to xe "except clause"catch and xe "handle (or resolve) an exception"handle any ValueErrors and ZeroDivisionErrors that arise. 1 while True:
2 try:
3 number1 = int(input('Enter numerator: '))
4 number2 = int(input('Enter denominator: '))
5 result = number1 / number2
6 except ValueError:
7 print('You must enter two integers
')
8 except ZeroDivisionError:
9 print('Attempted to divide by zero
')
10 else:
11 print(f'{number1:.3f} / {number2:.3f} = {result:.3f}')
12 break
Where in the code could either or both of these errors arise?

Accepted Answer

A)  line 3 
B)  line 5 
C)  lines 3 and 4 
D)  lines 3, 4 and 5 
A)  line 3 
B)  line 5 
C)  lines 3 and 4 
D)  lines 3, 4 and 5

Question 8

Which of the following statements is false?

Accepted Answer

A)  Many applications xe "resource:acquire"xe "acquire resources"acquire resources, such as files, network connections, database connections and more. You should xe "resource:release"xe "release resources"release resources when your application terminates. 
B)  The with statement acquires a resource and assigns its corresponding object to a variable. 
C)  The with statement allows the application to use the resource via that variable. 
D)  The with statement calls the resource object's xe "close method:of an object that uses a system resource"close method to release the resource when program control reaches the end of the with statement's suite. 
A)  Many applications xe "resource:acquire"xe "acquire resources"acquire resources, such as files, network connections, database connections and more. You should xe "resource:release"xe "release resources"release resources when your application terminates. 
B)  The with statement acquires a resource and assigns its corresponding object to a variable. 
C)  The with statement allows the application to use the resource via that variable. 
D)  The with statement calls the resource object's xe "close method:of an object that uses a system resource"close method to release the resource when program control reaches the end of the with statement's suite.

Question 9

Which of the following statements a), b) or c) is false?

Accepted Answer

A)  You can use JSON to serialize and deserialize objects to facilitate saving those objects to secondary storage and transmitting them over the Internet. 
B)  There are security vulnerabilities to serializing and deserializing data with the Python Standard Library's pickle module. 
C)  The with statement automatically releases a resource at the end of the statement's suite. 
D)  All of the above statements are true. 
A)  You can use JSON to serialize and deserialize objects to facilitate saving those objects to secondary storage and transmitting them over the Internet. 
B)  There are security vulnerabilities to serializing and deserializing data with the Python Standard Library's pickle module. 
C)  The with statement automatically releases a resource at the end of the statement's suite. 
D)  All of the above statements are true.

Question 10

Which of the following statements is false?

Accepted Answer

A)  A try clause may be followed by one or more except clauses that immediately follow the try clause's suite. 
B)  The except clauses also are known as xe "exception:handler"exception handlers. 
C)  Each xe "except clause"except clause specifies the type of exception it handles. 
D)  After the last except clause, an optional else clause specifies code that should execute only if the code in the try suite raised an exception. 
A)  A try clause may be followed by one or more except clauses that immediately follow the try clause's suite. 
B)  The except clauses also are known as xe "exception:handler"exception handlers. 
C)  Each xe "except clause"except clause specifies the type of exception it handles. 
D)  After the last except clause, an optional else clause specifies code that should execute only if the code in the try suite raised an exception.

Which of the following statements a), b) or c) is false?

Which of the following statements a), b) or c) is false?

Various types of exceptions can occur when you work with files. Which of the following statements a), b) or c) is false?

The int function raises a ________ if you attempt to convert to an integer a string (like 'hello') that does not represent a number.

Which of the following statements are false?

Which of the following statements a), b) or c) is false?

Which of the following statements is false?

Which of the following statements a), b) or c) is false?

Which of the following statements is false?

Introduction to Computers and Python

Introduction to Python Programming

Control Statements and Program Development

Functions

Sequences: Lists and Tuples

Dictionaries and Sets

Array-Oriented Programming With Num

Strings: a Deeper Look

Object-Oriented Programming

Computer Science Thinking: Recursion, Searching, Sorting and Big O

Natural Language Processing

Data Mining Twitter

Ibm Watson and Cognitive Computing

Machine Learning: Classification, Regression and Clustering

Deep Learning

Big Data: Hadoop, Spark, Nosql and Iot

Filters

Exam 9: Files and Exceptions

Which of the following statements a), b) or c) is false?

Which of the following statements a), b) or c) is false?

Various types of exceptions can occur when you work with files. Which of the following statements a), b) or c) is false?

The int function raises a ________ if you attempt to convert to an integer a string (like 'hello') that does not represent a number.

Which of the following statements are false?

Which of the following statements a), b) or c) is false?

Which of the following statements is false?

Which of the following statements a), b) or c) is false?

Which of the following statements is false?

Introduction to Computers and Python

Introduction to Python Programming

Control Statements and Program Development

Functions

Sequences: Lists and Tuples

Dictionaries and Sets

Array-Oriented Programming With Num

Strings: a Deeper Look

Object-Oriented Programming

Computer Science Thinking: Recursion, Searching, Sorting and Big O

Natural Language Processing

Data Mining Twitter

Ibm Watson and Cognitive Computing

Machine Learning: Classification, Regression and Clustering

Deep Learning

Big Data: Hadoop, Spark, Nosql and Iot

Filters