Flow control

Question 1

What is “Flow control”

Answer 1

Flow control statements can decide which Python instructions to execute under which conditions.

Question 2

What is the Boolean Value?

Answer 2

True or False and they always start with a capital T and F

Question 3

When do you get error while using boolean values?

Answer 3

➊. If you don’t use the proper case

➋ or you try to use True and False for variable names

Question 4

what do comparison operators do?

Answer 4

compare two values and evaluate down to a single Boolean value.

Question 5

What is the other name of comparison operators?

Answer 5

relational operators,

Question 6

What is the comparison operators for

“Equal to”

Answer 6

==

Question 7

What is the comparison operators for

Not equal to

Answer 7

!=

Question 8

What is the comparison operators for

Less than

Question 9

What is the comparison operators for

Greater than

Answer 9

>

Question 10

What is the comparison operators for

Less than or equal to

Answer 10

<=

Question 11

What is the comparison operators for

Greater than or equal to

Answer 11

> =

Question 12

What is the output of 42 == ‘42’ ? Why?

Answer 12

False, because and int or float are not equal to string

Question 13

what is the output of 42 == 42.0?

Answer 13

True

Question 14

what is the name and difference of == and =

Answer 14

The == operator (equal to) asks whether two values are the same as each other.
The = operator (assignment) puts the value on the right into the variable on the left.

Question 15

What are the Boolean Operators?

Answer 15

and
or
no

Question 16

Why are the and and or binary operators?

Answer 16

The and and or operators always take two Boolean values (or expressions), so they’re considered binary operators.

Question 17

The and and or Operator’s Truth Table:
True and True ?
True and False ?
False and True ? 
False and False ?
True or True ?
True or False ?
False or True ?
False or False ?

Answer 17

True
False
False
False
True
True
True
False

Question 18

Why is not operator a unary operator

Answer 18

Unlike and and or, the not operator operates on only one Boolean value (or expression). This makes it a unary operator

Question 19

The not Operator’s Truth Table:
Expression Evaluates to . . .

not True ?

not False ?

Answer 19

False

True

Question 20

Example of Mixing Boolean and Comparison Operators

Answer 20

> > > (4 < 5) and (5 < 6)
True
2 + 2 == 4 and not 2 + 2 == 5 and 2 * 2 == 2 + 2
True

Question 21

what is the order of operations for the Boolean operators

Answer 21

math
comparison operators
not
and
or

Question 22

What are the Elements of Flow Control?

Answer 22

condition and block of code (clause)

Question 23

What is a block of code?

Answer 23

Blocks begin when the indentation increases.
Blocks can contain other blocks.
Blocks end when the indentation decreases to zero or to a containing block’s indentation.

Question 24

Example of an if statement? Explain the component

Answer 24

if name == ‘Alice’:
print(‘Hi, Alice.’)
1. The if keyword
2. A condition (that is, an expression that evaluates to True or False)
3. A colon
4. Starting on the next line, an indented block of code (called the if clause)

Question 25

what is an else statement?

Answer 25

An if clause can optionally be followed by an else statement An else statement doesn’t have a condition, and in code, an else statement always consists of the following: The else keyword A colon Starting on the next line, an indented block of code (called the else clause)

Question 26

What is elif statement?

Answer 26

The elif statement is an “else if” statement that always follows an if or another elif statement. It provides another condition that is checked only if all of the previous conditions were False

Question 27

In code, an elif statement always consists of the following:

Answer 27

1. The elif keyword 2. A condition (that is, an expression that evaluates to True or False) 3. A colon 4. Starting on the next line, an indented block of code (called the elif clause)

Question 28

what is the limitation of using elif statement?

Answer 28

Once one of the statements’ conditions is found to be True, the rest of the elif clauses are automatically skipped.

Question 29

What do a while Loop Statements do?

Answer 29

You can make a block of code execute over and over again using a while statement. The code in a while clause will be executed as long as the while statement’s condition is True.

Question 30

what does a while statement consist of?

Answer 30

The while keyword A condition (that is, an expression that evaluates to True or False) A colon Starting on the next line, an indented block of code (called the while clause)

Question 31

The while clause is often called the ---- or just ----- .

Answer 31

while loop | the loop

Question 32

give an example of a while loop printing "Hello, world!" five times?

Answer 32

spam = 0 if spam < 5: print('Hello, world.') spam = spam + 1

Question 33

what is a break statement?

Answer 33

``` There is a shortcut to getting the program execution to break out of a while loop’s clause early. If the execution reaches a break statement, it immediately exits the while loop’s clause. ➊ while True: print('Please type your name.') ➋ name = input() ➌ if name == 'your name': ➍ break ➎ print('Thank you!') ```

Question 34

How to terminate a program execution immediately?

Answer 34

Ctrl + C

Question 35

what is a continue statement?

Answer 35

``` Like break statements, continue statements are used inside loops. When the program execution reaches a continue statement, the program execution immediately jumps back to the start of the loop and reevaluates the loop’s condition. while True: print('Who are you?') name = input() ➊ if name != 'Joe': ➋ continue print('Hello, Joe. What is the password? (It is a fish.)') ➌ password = input() if password == 'swordfish': ➍ break ➎ print('Access granted.') ```

Question 36

How to create a condition with and empty variable?

Answer 36

An empty variable is False, name="" while not name: # execute while until False, or until name is not empty any more ➋ if numOfGuests: ➌ print('Be sure to have enough room for all your guests.')

Question 37

what if you want to execute a block of code only a certain number of times?

Answer 37

You can do this with a for loop statement and the range() function. print('My name is') for i in range(5): print('Jimmy Five Times (' + str(i) + ')')

Question 38

What is the limitation of continue and break function usage?

Answer 38

We only can use them inside for and while loop

Question 39

What are the range() arguments?

Answer 39

``` range(start, stop, step) range(5,-1,-1) 5 4 3 2 1 0 ```

Question 40

What is importing a module?

Answer 40

If a function is not a built-in function, we need to import it import random import random, math, ....

Question 41

What if we name a python file similar to a function name?

Answer 41

then if we import a module, python import our file instead of the module !!!!

Question 42

How to get random numbers in a range?

Answer 42

import random for i in range(5): print(random.randint(1,10))

Question 43

How to end a program with sys.exit()

Answer 43

import sys ``` while True: print('Type exit to exit.') response = input() if response == 'exit': sys.exit() print('You typed ' + response + '.') ```