Python Basics

Question 1

What is code that returns a value when evaluated ?

Answer 1

Expressions. For example, the code wage * hours * weeks is an expression that computes a number.

Question 2

What is a variable ?

Answer 2

Variables are named references to values stored by the interpreter. Example: Wages, Salaries, Hours. These can hold specific values.

Question 3

What is an assignment ? Describe the syntax used.

Answer 3

An assignment is how you create new variables in python. A new variable is created using the = symbol. With the varialbe name on the left and the value on the right. Example future_car = 720s.

Question 4

How to display variables or expression values in python ?

Answer 4

print()

Question 5

What is the comment syntax in python ?

Answer 5

#

Question 6

What is the syntax to keep subsequent print statements on the same line ? How to keep this output on same line:
print(‘Hello world.’)
print(‘You’re gay.’)

Answer 6

end=’ ‘
print(‘Hello world.’, end=’ ‘)
print(‘You’re gay.’)

Question 7

How to output a variable name ?

Answer 7

print(variable_name)

Question 8

What is the syntax for a newline character ?
How would you print the number 2 on a newline given:
print(1, 2)

Answer 8

\n.
print(‘1\n2’)

Question 9

How to assign variable favorite_car, to input take from the user ?

Answer 9

favorite_car = input()

Question 10

How to convert strings to integers ?
Convert my_int = ‘123’ to an integer.

Answer 10

int()
my_int = int(‘123’)

Question 11

How to assign variable_name to an integer input by the user with an included prompt.

Answer 11

variable_name = int(input(‘: ‘, ))

Question 12

What are three things that every python object possesses ?

Answer 12

Type, value, identity

Question 13

What is an objects mutability and what determines it ?

Answer 13

Mutability means whether or not the object’s value can be changed. This is determined by type.

Question 14

How to print an object’s type ?

Answer 14

print(type(‘ABC’))

Question 15

What is an object’s identity ?

Answer 15

A unique identifier that describes the object. It usually references the object’s memory address where the object is stored.

Question 16

What are the data types that can be created using python ?

Answer 16

String, integer, float,

Question 17

What is a combination of items, like variables, literals, operators, and parentheses, that evaluates to a value, like 2 * (x + 1)

Answer 17

Expression

Question 18

A symbol that performs built in calculations ?
Give 5 examples.

Answer 18

Operator
+ - / * **

Question 19

What is a literal ?

Answer 19

A specific value in code like 2.

Question 20

Precedence rule order

Answer 20

(), **, unary-, */%, +-, left-to-right

Question 21

What is a script ?

Answer 21

A file containing Python code that is passed as input to the interpreter.

Question 22

What is dot notation ?

Answer 22

Used to reference an object in an imported module.

Question 23

What is the purpose of the import statement ?

Answer 23

To execute the contents of a file containing Python code and make available the definitions from that file.

Question 24

What is a module ?

Answer 24

A file containing Python code that is imported by a script, module, or interactive interpreter.

Question 25

What is the usage of the special name : __name__ ?

Answer 25

It is used to determine if the file was executed as a script by the programmer or imported by another module. If the value of __name__ is the string ‘__main__’, then the file was executed as a script.

Question 26

What is a function ?

Answer 26

A function is a list of statements that can be executed simply by referring to the function’s name, like the ones found in the math module.

Question 27

What is a function call ?

Answer 27

The process of invoking a function.

Question 28

What is the item passed to a function ?

Answer 28

Argument. A function can have several arguments.

Question 29

Which method returns a random integer between min and max ?

Answer 29

randint(min, max)

Question 30

Which method returns a random integer between min and max -1 ?

Answer 30

randrange(min, max)

Question 31

The numbers generated by the random module are known as __ ? The module has an equation to compute the next “random” number from the previous one, (invisibly) keeping track of the previous one.

Answer 31

Pseudo-random

Question 32

For the first call to any random method, no previous random number exists, so the method uses a built-in integer based on the current time, called a __ ?

Answer 32

Seed

Question 33

Specifying a seed() before using a random method will yield the same sequence of integers ?

Answer 33

True

Question 34

Program

Answer 34

consists of instructions executing one at a time. Instruction types include input, process, and output.

Question 35

Input

Answer 35

Instruction type. A program receives data from a file, keyboard, touchscreen, network, etc

Question 36

Process

Answer 36

Instruction type. A program performs computations on that data, such as adding two values like x + y.

Question 37

Output

Answer 37

Instruction type. A program puts that data somewhere, such as a file, screen, or network.

Question 38

Statement

Answer 38

a program instruction. A program mostly consists of a series of statements, and each statement usually appears on its own line.

Question 39

Syntax error

Answer 39

The program contains invalid code that cannot be understood

Question 40

Indentation error

Answer 40

The lines of the program are not properly indented.

Question 41

Value error

Answer 41

An invalid value is used, which can occur if giving letters to int().

Question 42

Name error

Answer 42

The program tries to use a variable that does not exist.

Question 43

Type error

Answer 43

An operation uses incorrect types, which can occur if adding an integer to a string.

Question 44

Logic error (bug)

Answer 44

Code that has correct syntax, but has a different meaning than intended. So the interpreter will not generate an error message, but the program’s output is not what the programmer expects.

Question 45

Arbitrary

Answer 45

based on random choice or personal whim, rather than any reason or system.

Question 46

Cache

Answer 46

Because speed is so important, a processor may contain a small amount of RAM on its own chip, called cache memory, accessible in one clock tick rather than several, for maintaining a copy of the most-used instructions/data.

Question 47

transistors

Answer 47

engineers created smaller switches called transistors, which in 1958 were integrated onto a single chip called an integrated circuit or IC. Oo