Test 3 Chapters 7, 8, and 9

Question 1

Using floating-point numbers can lead to arithmetic errors because floating-point numbers

Answer 1

approximate values

Question 2

To read a list of lists that’s stored in a binary file, you use

Answer 2

the load() method of the pickle module

Question 3

A binary file is like a text file in all but one of the following ways. Which one is it?

Answer 3

A binary file stores numbers with binary notation.

Question 4

A method for creating an object in a class.

Answer 4

constructor

Question 5

CSV File

Answer 5

is a type of text file that stores multiple values in each line (.csv)

Question 6

The csv module is a standard module so you don’t need to import it

Answer 6

Which of the following is not true about a CSV file?

Question 7

Decimal Class

Answer 7

a decimal object that stores a decimal number

Question 8

Exact Value

Answer 8

exact value that yields expected results

Question 9

Except Clause

Answer 9

except is used to catch and handle the exception(s) that are encountered in the try clause.

Question 10

Exception

Answer 10

occurs when you try to open a file that does not exist and the program crashes

Question 11

exit()

Answer 11

To cancel the execution of a program in the catch clause of a try statement, you can use the

Question 12

ceil()

Answer 12

returns ceiling value of x i.e., the smallest integer not less than x.

Question 13

FileNotFoundError

Answer 13

If a program attempts to read from a file that does not exist, which of the following will catch that error?

Question 14

Finally Clause

Answer 14

a part of a try block that is executed no matter how the try block is exited

Question 15

float(data)

Answer 15

method is used to return a floating point number from a number or a string.

Question 16

int(data)

Answer 16

method is used to return an integer point from a number.

Question 17

Floating-Point Error

Answer 17

It’s a problem caused when the internal representation of floating-point numbers, which uses a fixed number of binary digits to represent a decimal number

Question 18

Floating-Point Number

Answer 18

any number with a decimal point

Question 19

floor()

Answer 19

returns floor of x i.e., the largest integer not greater than x.

Question 20

To define a variable named number that contains 123.4567 as a decimal number, not a floating-point number, which block of code would you use?

Answer 20

from decimal import Decimal

number = Decimal(123.4567)

Question 21

Immutable

Answer 21

cannot be changed

Question 22

Index

Answer 22

refers to a position within an ordered list. Python strings can be thought of as lists of characters; each character is given an index from zero (at the beginning) to the length minus one (at the end).

Question 23

lc.setlocale

Answer 23

opens access to the POSIX locale database and functionality. The POSIX locale mechanism allows programmers to deal with certain cultural issues in an application, without requiring the programmer to know all the specifics of each country where the software is executed.

Question 24

Locale Module

Answer 24

part of Python’s internationalization and localization support library. It provides a standard way to handle operations that may depend on the language or location of a user.

Question 25

Math Module

Answer 25

provides access to the mathematical functions defined by the C standard.

Question 26

Mutable

Answer 26

can be changed

Question 27

New Line

Answer 27

\n it is used to indicate the end of a line of text

Question 28

OS Error

Answer 28

a built-in exception in Python and serves as the error class for the os module, which is raised when an os specific system function returns a system-related error, including I/O failures such as “file not found” or “disk full”.

Question 29

Pickle

Answer 29

generally known as serializing an object, writing a python object to a binary file

Question 30

Pickle Module

Answer 30

makes it easier to work with binary files, it automates the process of storing an object in a binary file

Question 31

Print Format

Answer 31

prints the specified message to the screen, or other standard output device. The message can be a string, or any other object, the object will be converted into a string before written to the screen.

Question 32

print(data).format

Answer 32

give placeholders an explicit positional index.This allows for re-arranging the order of display without changing the arguments.

Question 33

Raise Statement

Answer 33

To throw an exception with Python code, you use the

Question 34

read()

Answer 34

returns the specified number of bytes from the file.

Question 35

readline()

Answer 35

method returns one line from the file.You can also specified how many bytes from the line to return, by using the size parameter.

Question 36

reader()

Answer 36

s used to read the file, which returns an iterable object.

Question 37

readlines()

Answer 37

returns a list containing each line in the file as a list item.

Question 38

Repitition Operator

Answer 38

makes multiple copies of a tuple and joins them all together.

Question 39

Scientific Notation

Answer 39

a method for expressing a given quantity as a number having significant digits necessary for a specified degree of accuracy, multiplied by 10 to the appropriate power, as 1385.62 written as 1.386 × 103.

Question 40

setlocale()

Answer 40

modifies the locale setting for the category.

Question 41

sys module

Answer 41

provides functions and variables used to manipulate different parts of the Python runtime environment.

Question 42

Text File

Answer 42

stores all of its data as characters and each line ends with a new line character

Question 43

Try Clause

Answer 43

all statements are executed until an exception is encountered. except is used to catch and handle the exception(s) that are encountered. Else lets you code sections that should run only when no exceptions are encountered

Question 44

Try Statement

Answer 44

you code any statements that may throw an exception in the try clause

Question 45

type()

Answer 45

either returns the type of the object or returns a new type object based on the arguments passed

Question 46

with open()

Answer 46

returns a file object, which has methods and attributes for getting information about and manipulating the opened file.

Question 47

With Statement

Answer 47

used to open a file object thats only available for its block of statements