# 6.4. Boolean Expression¶

• Ternary Operator

• Conditional Expression

• Shorthand Expressions

## 6.4.1. Recap¶

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


## 6.4.2. SetUp¶

Simulate user input (for test automation):

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


## 6.4.3. Conditional Expression¶

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


## 6.4.4. Shorthand Expressions¶

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


## 6.4.5. Use Case - 0x01¶

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


## 6.4.6. 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


## 6.4.7. Use Case - 0x03¶

• Even/odd

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


## 6.4.8. Use Case - 0x04¶

• Astronaut/Cosmonaut

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


## 6.4.9. 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


## 6.4.10. Assignments¶

"""
* Required: yes
* Complexity: easy
* Lines of code: 1 lines
* Time: 3 min

English:
1. Define result: str with:
a. 'underage' if user age is less than 18
b. 'adult' if user age is equal or greater than 18
2. Non-functional requirements:
a. Use one line if
3. Run doctests - all must succeed

Polish:
1. Zdefiniuj result: str z:
a. 'underage' jeżeli wiek użytkownika jest mniejszy niż 18
b. 'adult' jeżeli wiek użytkownika jest równy lub większy 18
2. Wymagania niefunkcjonalne:
a. Wykorzystaj jednolinikowego if
3. Uruchom doctesty - wszystkie muszą się powieść

Hints:
* >=

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 ('underage', 'adult'), \
'Variable result must be either underage or adult'
"""

AGE = 12

# type: str
result = ...


"""
* Assignment: Conditional Expression IPv4/IPv6
* Required: yes
* Complexity: easy
* Lines of code: 1 lines
* Time: 3 min

English:
1. To result: bool 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: bool 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

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'
"""