Question 1

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

Accepted Answer

A)  Operating systems typically can prevent more than one program from manipulating a file at once. 
B)  When a program finishes processing a file, the program immediately should close it to release the resource. This enables other programs to use the file (if they're allowed to access it). 
C)  Closing a file creates a resource leak in which the file resource is not available to other programs. 
D)  All of the above statements are true. 
A)  Operating systems typically can prevent more than one program from manipulating a file at once. 
B)  When a program finishes processing a file, the program immediately should close it to release the resource. This enables other programs to use the file (if they're allowed to access it). 
C)  Closing a file creates a resource leak in which the file resource is not available to other programs. 
D)  All of the above statements are true. C

Question 2

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

Accepted Answer

A)  The file open modes for writing and appending raise a FileNotFoundError if the file does not exist. 
B)  Each text-file mode has a corresponding binary-file mode specified with b, as in 'rb' or 'wb+'. 
C)  You use binary-file modes for reading or writing binary files, such as images, audio, video, compressed ZIP files and many other popular custom file formats. 
D)  All of the above statements are true. 
A)  The file open modes for writing and appending raise a FileNotFoundError if the file does not exist. 
B)  Each text-file mode has a corresponding binary-file mode specified with b, as in 'rb' or 'wb+'. 
C)  You use binary-file modes for reading or writing binary files, such as images, audio, video, compressed ZIP files and many other popular custom file formats. 
D)  All of the above statements are true. A

Question 3

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

Accepted Answer

A)  The following code writes an object in JSON format to a file: import json
With open('accounts.json', 'w') as accounts:
Json.dump(accounts_dict, accounts) 
B)  The snippet in Part (a) opens the file accounts.json and uses the json module's dump function to serialize the dictionary accounts_dict into the file. 
C)  JSON delimits strings with double-quote characters. 
D)  All of the above statements are true. 
A)  The following code writes an object in JSON format to a file: import json
With open('accounts.json', 'w') as accounts:
Json.dump(accounts_dict, accounts) 
B)  The snippet in Part (a) opens the file accounts.json and uses the json module's dump function to serialize the dictionary accounts_dict into the file. 
C)  JSON delimits strings with double-quote characters. 
D)  All of the above statements are true. D

Question 4

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

Accepted Answer

A)  Python imposes a convenient record structure on files. 
B)  The following code creates an accounts.txt file and writes five client records to the file. Generally, records in text files are stored one per line, so we end each record with a newline character: with open('accounts.txt', mode='w') as accounts:
Accounts.write('100 Jones 24.98
')
Accounts.write('200 Doe 345.67
')
Accounts.write('300 White 0.00
')
Accounts.write('400 Stone -42.16
')
Accounts.write('500 Rich 224.62
') 
C)  You can also write to a file with print (which automatically outputs a 
), as in print('100 Jones 24.98', file=accounts) 
D)  All of the above statements are true. 
A)  Python imposes a convenient record structure on files. 
B)  The following code creates an accounts.txt file and writes five client records to the file. Generally, records in text files are stored one per line, so we end each record with a newline character: with open('accounts.txt', mode='w') as accounts:
Accounts.write('100 Jones 24.98
')
Accounts.write('200 Doe 345.67
')
Accounts.write('300 White 0.00
')
Accounts.write('400 Stone -42.16
')
Accounts.write('500 Rich 224.62
') 
C)  You can also write to a file with print (which automatically outputs a 
), as in print('100 Jones 24.98', file=accounts) 
D)  All of the above statements are true.

Question 5

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

Accepted Answer

A)  JSON objects are similar to Python lists. Each xe "JSON (JavaScript Object Notation):JSON object"JSON object contains a comma-separated list of property names and values, in curly braces. For example, the following JSON object might represent a client record: {"account": 100, "name": "Jones", "balance": 24.98} 
B)  JSON also supports xe "JSON (JavaScript Object Notation):array"xe "array:JSON"arrays which, like Python lists, are comma-separated values in square brackets. For example, the following is an acceptable JSON array of numbers: [100, 200, 300] 
C)  Values in JSON objects and arrays can be xe "JSON (JavaScript Object Notation):string"xe "string built-in type:in JSON"strings in double quotes, numbers, JSON xe "JSON (JavaScript Object Notation):Boolean values"xe "Boolean values in JSON"Boolean values (xe "JSON (JavaScript Object Notation):true"true or xe "JSON (JavaScript Object Notation):false"false),xe "JSON (JavaScript Object Notation):null"xe "null in JSON" null (to represent no value, like None in Python), arrays and other JSON objects. 
D)  All of the above statements are true. 
A)  JSON objects are similar to Python lists. Each xe "JSON (JavaScript Object Notation):JSON object"JSON object contains a comma-separated list of property names and values, in curly braces. For example, the following JSON object might represent a client record: {"account": 100, "name": "Jones", "balance": 24.98} 
B)  JSON also supports xe "JSON (JavaScript Object Notation):array"xe "array:JSON"arrays which, like Python lists, are comma-separated values in square brackets. For example, the following is an acceptable JSON array of numbers: [100, 200, 300] 
C)  Values in JSON objects and arrays can be xe "JSON (JavaScript Object Notation):string"xe "string built-in type:in JSON"strings in double quotes, numbers, JSON xe "JSON (JavaScript Object Notation):Boolean values"xe "Boolean values in JSON"Boolean values (xe "JSON (JavaScript Object Notation):true"true or xe "JSON (JavaScript Object Notation):false"false),xe "JSON (JavaScript Object Notation):null"xe "null in JSON" null (to represent no value, like None in Python), arrays and other JSON objects. 
D)  All of the above statements are true.

Question 6

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

Accepted Answer

A)  Wrap a separate try statement around every individual statement that raises an exception. 
B)  For proper exception-handling granularity, each try statement should enclose a section of code small enough that, when an exception occurs, the specific context is known and the except handlers can process the exception properly. 
C)  If many statements in a try suite raise the same exception types, multiple try statements may be required to determine each exception's context. 
D)  All of the above statements are true. 
A)  Wrap a separate try statement around every individual statement that raises an exception. 
B)  For proper exception-handling granularity, each try statement should enclose a section of code small enough that, when an exception occurs, the specific context is known and the except handlers can process the exception properly. 
C)  If many statements in a try suite raise the same exception types, multiple try statements may be required to determine each exception's context. 
D)  All of the above statements are true.

Question 7

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

Accepted Answer

A)  Python views text files and binary files (for images, videos and more) as xe "sequence:of bytes"sequences of bytes. 
B)  As in lists and arrays, the first character in a text file and byte in a binary file is located at position 0, so in a file of n characters or bytes, the highest position number is n - 1. 
C)  For each file you open, Python creates a file object that you'll use to interact with the file. 
D)  All of the above statements are true. 
A)  Python views text files and binary files (for images, videos and more) as xe "sequence:of bytes"sequences of bytes. 
B)  As in lists and arrays, the first character in a text file and byte in a binary file is located at position 0, so in a file of n characters or bytes, the highest position number is n - 1. 
C)  For each file you open, Python creates a file object that you'll use to interact with the file. 
D)  All of the above statements are true.

Question 8

Which of the following statements are false?

Accepted Answer

A)  A file object's readlines method xe "read a file into a program"reads an entire text file and returns each line as a string in a list of strings. 
B)  Calling readlines for a large file can be a time-consuming operation, which must complete before you can begin using the list of strings. 
C)  Using the file object in a for statement enables your program to process each text line as it's read. 
D)  All of the above statements are true. 
A)  A file object's readlines method xe "read a file into a program"reads an entire text file and returns each line as a string in a list of strings. 
B)  Calling readlines for a large file can be a time-consuming operation, which must complete before you can begin using the list of strings. 
C)  Using the file object in a for statement enables your program to process each text line as it's read. 
D)  All of the above statements are true.

Question 9

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

Accepted Answer

A)  Variables, lists, tuples, dictionaries, sets, arrays, pandas Series and pandas DataFrames offer long-term data storage. 
B)  Computers store files on secondary storage devices, including xe "solid-state drive"solid-state drives, xe "hard disk"hard disks and more. 
C)  Some popular text file formats are plain text, xe "JSON (JavaScript Object Notation)"JSON (JavaScript Object Notation) and xe "CSV (comma-separated value) format"CSV (comma-separated values). 
D)  All of the above statements are true? 
A)  Variables, lists, tuples, dictionaries, sets, arrays, pandas Series and pandas DataFrames offer long-term data storage. 
B)  Computers store files on secondary storage devices, including xe "solid-state drive"solid-state drives, xe "hard disk"hard disks and more. 
C)  Some popular text file formats are plain text, xe "JSON (JavaScript Object Notation)"JSON (JavaScript Object Notation) and xe "CSV (comma-separated value) format"CSV (comma-separated values). 
D)  All of the above statements are true?

Question 10

Which of the following statements is false?

Accepted Answer

A)  Attempting to divide by 0 results in a xe "ZeroDivisionError"ZeroDivisionError. 
B)  When a program attempts to divide by zero, the interpreter is said to raise an exception of type xe "ZeroDivisionError"ZeroDivisionError. 
C)  When an exception is raised in an interactive IPython session, it displays the exception's traceback, then terminates the IPython session. 
D)  If an exception occurs in a script, IPython terminates the script and displays the exception's traceback. 
A)  Attempting to divide by 0 results in a xe "ZeroDivisionError"ZeroDivisionError. 
B)  When a program attempts to divide by zero, the interpreter is said to raise an exception of type xe "ZeroDivisionError"ZeroDivisionError. 
C)  When an exception is raised in an interactive IPython session, it displays the exception's traceback, then terminates the IPython session. 
D)  If an exception occurs in a script, IPython terminates the script and displays the exception's traceback.

Question 11

Which of the following statements is false?

Accepted Answer

A)  A try statement can have a finally clause as its last clause after any except clauses or else clause. 
B)  The finally clause is guaranteed to execute, regardless of whether its try suite executes successfully or an exception occurs. 
C)  In other languages that have finally, the finally suite is an ideal location to place resource-deallocation code for resources acquired in the corresponding try suite. 
D)  In Python, we prefer the else clause of a try statement for resource-deallocation code and place other kinds of "clean up" code in the finally suite. 
A)  A try statement can have a finally clause as its last clause after any except clauses or else clause. 
B)  The finally clause is guaranteed to execute, regardless of whether its try suite executes successfully or an exception occurs. 
C)  In other languages that have finally, the finally suite is an ideal location to place resource-deallocation code for resources acquired in the corresponding try suite. 
D)  In Python, we prefer the else clause of a try statement for resource-deallocation code and place other kinds of "clean up" code in the finally suite.

Question 12

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

Accepted Answer

A)  The json module's dumps function returns a Python string representation of an object in JSON format. 
B)  Using dumps with load, you can read JSON from a file and display it in a nicely indented format-sometimes called "pretty printing" the JSON. 
C)  When the dumps function call includes the indent keyword argument, as in with open('accounts.json', 'r') as accounts:
Print(json.dumps(json.load(accounts), indent=4))
The string contains newline characters and indentation for pretty printing-you also can use indent with the dump function when writing to a file: 
D)  All of the above statements are true. 
A)  The json module's dumps function returns a Python string representation of an object in JSON format. 
B)  Using dumps with load, you can read JSON from a file and display it in a nicely indented format-sometimes called "pretty printing" the JSON. 
C)  When the dumps function call includes the indent keyword argument, as in with open('accounts.json', 'r') as accounts:
Print(json.dumps(json.load(accounts), indent=4))
The string contains newline characters and indentation for pretty printing-you also can use indent with the dump function when writing to a file: 
D)  All of the above statements are true.

Question 13

When a Python program begins execution, it creates three xe "file object:standard"xe "standard file objects"standard file objects: $\bullet$sys.stdin-the standard input file object,
$\bullet$sys.stdout-the standard output file object, and
$\bullet$sys.stderr-the standard error file object.
You must import the sys module if you need to refer to these objects explicitly in your code, but this is rare. Which of the following statements is false?

Accepted Answer

A)  Though these are considered file objects, they do not read from or write to files by default. 
B)  The input function implicitly uses sys.stdin to get user input from the keyboard. 
C)  Function print implicitly outputs to sys.stdout, which appears in the command line. 
D)  Python implicitly outputs program errors and tracebacks to sys.stdout. 
A)  Though these are considered file objects, they do not read from or write to files by default. 
B)  The input function implicitly uses sys.stdin to get user input from the keyboard. 
C)  Function print implicitly outputs to sys.stdout, which appears in the command line. 
D)  Python implicitly outputs program errors and tracebacks to sys.stdout.

Question 14

b. When there are except handlers, program control transfers to the first one that matches the type of the raised exception. If there are no except handlers that match the raised exception, a process called xe "stack:unwinding"stack unwinding occurs.
c. When an except clause successfully handles an exception, program execution resumes with the finally clause (if there is one), then with the next statement after the try statement.
d. After an exception is handled, program control returns to the xe "raise point"raise point.
Answer: d. Actually, after an exception is handled, program control does not return to the xe "raise point"raise point-rather, control resumes after the try statement.
9.8.3 xe "multiple-exception catching[multiple exception catching]"xe "except clause:catching multiple exceptions"xe "catching multiple exceptions in one except clause"Catching Multiple Exceptions in One except Clause
-Which of the following statements is false?

Accepted Answer

A)  A try clause is often followed by several except clauses to handle various types of exceptions. 
B)  When no exceptions occur in the try suite, program execution resumes with the xe "else clause:of a try statement"else clause (if there is one); otherwise, program execution resumes with the next statement after the try statement. 
C)  If several except suites are identical, you can catch those exception types by specifying them as a tuple in a single except handler, as in: except [type1, type2, …] as variable_name 
D)  You can use the variable name in the optional as-clause to reference the exception object in the except suite. 
A)  A try clause is often followed by several except clauses to handle various types of exceptions. 
B)  When no exceptions occur in the try suite, program execution resumes with the xe "else clause:of a try statement"else clause (if there is one); otherwise, program execution resumes with the next statement after the try statement. 
C)  If several except suites are identical, you can catch those exception types by specifying them as a tuple in a single except handler, as in: except [type1, type2, …] as variable_name 
D)  You can use the variable name in the optional as-clause to reference the exception object in the except suite.

Question 15

Which of the following statements is false?

Accepted Answer

A)  For a text file, the read method returns a string containing the number of characters specified by the method's integer argument. For a binary file, the method returns the specified number of bytes. If no argument is specified, the method returns the entire contents of the file. 
B)  The readline method returns one line of text as a string, including the newline character if there is one. 
C)  The readline method issues an EndOfFileError when it encounters the end of the file. 
D)  The writelines method receives a list of strings and writes its contents to a file. 
A)  For a text file, the read method returns a string containing the number of characters specified by the method's integer argument. For a binary file, the method returns the specified number of bytes. If no argument is specified, the method returns the entire contents of the file. 
B)  The readline method returns one line of text as a string, including the newline character if there is one. 
C)  The readline method issues an EndOfFileError when it encounters the end of the file. 
D)  The writelines method receives a list of strings and writes its contents to a file.

Question 16

The json module enables you to convert objects to xe "JSON (JavaScript Object Notation)"JSON (JavaScript Object Notation) text format. This is known as ________ the data.

Accepted Answer

A)  chunking 
B)  calibrating 
C)  serializing 
D)  registering 
A)  chunking 
B)  calibrating 
C)  serializing 
D)  registering

Question 17

If the contents of a file should not be modified, open the file for ________-another example of the xe "principle of least privilege"principle of least privilege. This prevents the program from accidentally modifying the file.

Accepted Answer

A)  writing only 
B)  reading only 
C)  reading and writing 
D)  none of the above 
A)  writing only 
B)  reading only 
C)  reading and writing 
D)  none of the above

Question 18

Which of the following statements is false?

Accepted Answer

A)  When an exception occurs in a try suite, it terminates immediately. 
B)  When there are except handlers, program control transfers to the first one that matches the type of the raised exception. If there are no except handlers that match the raised exception, a process called stack unwinding occurs. 
C)  When an except clause successfully handles an exception, program execution resumes with the finally clause (if there is one), then with the next statement after the try statement. 
D)  After an exception is handled, program control returns to the raise point. 
A)  When an exception occurs in a try suite, it terminates immediately. 
B)  When there are except handlers, program control transfers to the first one that matches the type of the raised exception. If there are no except handlers that match the raised exception, a process called stack unwinding occurs. 
C)  When an except clause successfully handles an exception, program execution resumes with the finally clause (if there is one), then with the next statement after the try statement. 
D)  After an exception is handled, program control returns to the raise point.

Question 19

Which of the following statements are false?

Accepted Answer

A)  Many libraries you'll use to interact with xe "cloud-based services"cloud-based services such as Twitter, IBM Watson and others communicate with your applications via JSON (JavaScript Object Notation) objects. 
B)  JSON is a dxe "JSON (JavaScript Object Notation):data-interchange format"xe "data-interchange format:JSON"ata-interchange format readable only by computers and used to represent objects (such as dictionaries, lists and more) as collections of name-value pairs. 
C)  JSON can represent objects of custom classes. 
D)  JSON has become the preferred data format for transmitting objects across platforms. This is especially true for invoking cloud-based xe "web service"web services, which are functions and methods that you call over the Internet. 
A)  Many libraries you'll use to interact with xe "cloud-based services"cloud-based services such as Twitter, IBM Watson and others communicate with your applications via JSON (JavaScript Object Notation) objects. 
B)  JSON is a dxe "JSON (JavaScript Object Notation):data-interchange format"xe "data-interchange format:JSON"ata-interchange format readable only by computers and used to represent objects (such as dictionaries, lists and more) as collections of name-value pairs. 
C)  JSON can represent objects of custom classes. 
D)  JSON has become the preferred data format for transmitting objects across platforms. This is especially true for invoking cloud-based xe "web service"web services, which are functions and methods that you call over the Internet.

Question 20

The json module's ________ function reads the entire JSON contents of its file object argument and converts the JSON into a Python object. This is known as ________ the data.

Accepted Answer

A)  read, serializing 
B)  load, serializing 
C)  load, deserializing 
D)  read, deserializing 
A)  read, serializing 
B)  load, serializing 
C)  load, deserializing 
D)  read, deserializing

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

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

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

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

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

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

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

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 is false?

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

Which of the following statements is false?

The json module enables you to convert objects to xe "JSON (JavaScript Object Notation)"JSON (JavaScript Object Notation) text format. This is known as ________ the data.

If the contents of a file should not be modified, open the file for ________-another example of the xe "principle of least privilege"principle of least privilege. This prevents the program from accidentally modifying the file.

Which of the following statements is false?

Which of the following statements are false?

The json module's function reads the entire JSON contents of its file object argument and converts the JSON into a Python object. This is known as the data.

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?

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

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

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

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

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

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 is false?

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

Which of the following statements is false?

The json module enables you to convert objects to xe "JSON (JavaScript Object Notation)"JSON (JavaScript Object Notation) text format. This is known as ________ the data.

If the contents of a file should not be modified, open the file for ________-another example of the xe "principle of least privilege"principle of least privilege. This prevents the program from accidentally modifying the file.

Which of the following statements is false?

Which of the following statements are false?

The json module's ________ function reads the entire JSON contents of its file object argument and converts the JSON into a Python object. This is known as ________ the data.

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

The json module's function reads the entire JSON contents of its file object argument and converts the JSON into a Python object. This is known as the data.