Chapter 2 - Glossary

Question 1

Variable

Answer 1

A variable is a name that refers to a value.

Question 2

Expression

Answer 2

An expression is a combination of values, variables, and operators

Question 3

> > > n + 25

Is this correct.

Answer 3

Yes this this display the value of n+25 in interactive mode.

Question 4

Difference Between Python Interactive mode and script mode.

Answer 4

> > > miles = 26.2
miles * 1.61
42.182Python Interactive mode is when we run python code from the python terminal. In interactive mode, we don’t want to type print expression, only a variable name is sufficient to print the value of a variable. Script mode is when we save python code in the file as .py extension

Question 5

Order of Operations

Answer 5

PEMDAS - Order of Precedence
Equal precedence operators evaluated left to right
Multiply & Divide has same precedence
Add & Subtract also has same .

Question 6

Which Operators works on string.

Answer 6

\+ and * works on strings
a = 'Hemant'
b = ' Kumar'
print(a+b)
c = 'Bye '
print(c * 4)

Question 7

Types of Errors in a Program ?

Answer 7

Syntax Errors
Runtime Errors
Semantic Errors

Question 8

Assignment

Answer 8

A statement that assigns a value to a variable.

Question 9

Keyword

Answer 9

A reserved word in programing language

Question 10

Expression

Answer 10

Expression is a combination of variables, operations and values that yields a result value.

5 * 5 # yields 25

Question 11

Statement

Answer 11

Statements represent an action or command e.g print statements, assignment statements.

print ‘hello’, x = 1

Question 12

Execute

Answer 12

To run a statement and do what it says.

Question 13

Interactive Mode

Answer 13

A way of using the Python interpreter by typing code at the prompt.

Question 14

Script Mode

Answer 14

A way of using the Python interpreter to read code from a script and run it.

Question 15

Order of Operations

Answer 15

Operator Precedence table

Question 16

Concatenate

Answer 16

To join two strings or operands

Question 17

Semantic Error

Answer 17

An error in a program that makes it do something other than what the program‐
mer intended.

Question 18

Semantics

Answer 18

The meaning of a program.

Question 19

How about x = y = 1?

Answer 19

True statement.

It creates two variables x & y and assign value 1

Question 20

In some languages every statement ends with a semicolon, ;. What happens if
you put a semicolon at the end of a Python statement?

Answer 20

Semicolon works as an indentation in Python.