# 9.4. Boolean Expression

• Ternary Operator

• Conditional Expression

• Shorthand Expressions

## 9.4.1. Recap

>>> number = 3
>>>
>>> if number in range(0,10):
...     is_digit = True
... else:
...     is_digit = False
>>>
>>> print(is_digit)
True

## 9.4.2. SetUp

Simulate user input (for test automation):

>>> from unittest.mock import MagicMock
>>> input = MagicMock(side_effect=['10', '10'])

## 9.4.3. Conditional Expression

>>> number = 3
>>> is_digit = True if number in range(0,10) else False
>>>
>>> print(is_digit)
True

## 9.4.4. Shorthand Expressions

>>> number = 3
>>> is_digit = (number in range(0,10))
>>>
>>> print(is_digit)
True

## 9.4.5. Use Case - 0x01

>>> age = input('What is your age?: ')   #input: '10'
>>> adult = 'Yes' if int(age) >= 18 else 'No'
>>>
No

## 9.4.6. Use Case - 0x02

• Is numeric

>>> age = input('What is your age?: ')   #input: '10'
>>> age = float(age) if age.isnumeric() else None
>>>
>>> print(age)
10.0

## 9.4.7. Use Case - 0x03

• Even/odd

>>> number = 3
>>> is_even = (number % 2 == 0 )
>>>
>>> print(is_even)
False

## 9.4.8. Use Case - 0x04

• Astronaut/Cosmonaut

>>> country = 'Russia'
>>> job = 'astronaut' if country == 'USA' else 'cosmonaut'
>>>
>>> print(job)
cosmonaut

## 9.4.9. Use Case - 0x05

• IPv4/IPv6

>>> ip = '127.0.0.1'
>>> protocol = 'IPv4' if '.' in ip else 'IPv6'
>>>
>>> print(protocol)
IPv4
>>> ip = 'fe80::aede:48ff:fe01:1133'
>>> protocol = 'IPv4' if '.' in ip else 'IPv6'
>>>
>>> print(protocol)
IPv6

## 9.4.10. Assignments

Code 9.4. Solution
"""
* Type: class assignment
* Complexity: easy
* Lines of code: 1 lines
* Time: 3 min

English:
1. The user entered his/her age: 30
2. Define variable result: str with value:
a. 'junior' - if age is below 18
b. 'senior' - if age is 18 or above
3. Use conditional expression (if one-liner)
4. Run doctests - all must succeed

Polish:
1. Użytkownik podał swój wiek: 30
2. Zdefiniuj zmienną result: str z wartością:
a. 'junior' - jeżeli wiek jest poniżej 18 lat
b. 'senior' - jeżeli wiek jest 18 lat lub więcej
3. Wykorzystaj warunkowe wyrażenie (jednolinikowego if)
4. Uruchom doctesty - wszystkie muszą się powieść

Hints:
* <

Tests:
>>> import sys; sys.tracebacklimit = 0
>>> from pprint import pprint

>>> assert result is not Ellipsis, \
'Assign your result to variable result'

>>> assert type(result) is str, \
'Variable result has invalid type, should be str'

>>> assert result in {'junior', 'senior'}, \
'Variable result should be either junior or senior'

>>> pprint(result)
'senior'
"""

AGE = 30

# Define variable result: str with value:
# - 'junior' - if age is below 18
# - 'senior' - if age is 18 or above
# Use conditional expression (if one-liner)
# type: str
result = ...

Code 9.5. Solution
"""
* Assignment: Conditional Expression IPv4/IPv6
* Type: class assignment
* Complexity: easy
* Lines of code: 1 lines
* Time: 3 min

English:
1. To result: str assign whether IP_ADDRESS is IPv4 or IPv6 protocol:
a. IPv4 if dot . is in the IP address
b. IPv6 if dot . is not in the IP address
2. Non-functional requirements:
a. Use one line if
3. Run doctests - all must succeed

Polish:
1. Do result: str przypisz czy IP_ADDRESS jest protokołu IPv4 czy IPv6:
a. IPv4 jeżeli jest kropka . w adresie IP
b. IPv6 jeżeli kropki nie ma
2. Wymagania niefunkcjonalne:
a. Wykorzystaj jednolinikowego if
3. Uruchom doctesty - wszystkie muszą się powieść

Hints:
* in
* In IPv6 address there is no dot .
* IPv4 example: 127.0.0.1
* IPv6 example: 2001:0db8:85a3:0000:0000:8a2e:0370:7334

Tests:
>>> import sys; sys.tracebacklimit = 0

>>> assert result is not Ellipsis, \
'Assign your result to variable result'

>>> assert type(result) is str, \
'Variable result has invalid type, should be str'

>>> assert result in ('IPv4', 'IPv6'), \
'Variable result must be either IPv4 or IPv6'
"""