7.3. Block Elif¶

Used to check for additional condition if first is not met
In other languages is known as else if
Conditional Alternative

7.3.1. Syntax¶

Optional else

>>> 
... if <condition>:
...     <do something>
... elif <condition>:
...     <do something>

>>> 
... if <condition>:
...     <do something>
... elif <condition>:
...     <do something>
... else:
...     <do something>

7.3.2. SetUp¶

Simulate user input (for test automation):

>>> from unittest.mock import MagicMock
>>> input = MagicMock(side_effect=['5', '5', '10', 'Polish'])

7.3.3. Example¶

>>> number = int(input('Type digit: '))  #input: '5'
>>>
>>>
>>> if 0 <= number < 3:
...     print('small')
... elif 3 <= number < 7:
...     print('medium')
... elif 7 <= number < 10:
...     print('large')
medium

7.3.4. Why not many ifs?¶

With many ifs, Python will evaluate all of them
With elifs Python will stop, after first True evaluation

>>> number = int(input('Type digit: '))  #input: '5'
>>>
>>>
>>> if 0 <= number < 3:
...     print('small')
>>>
>>> if 3 <= number < 7:
...     print('medium')
medium
>>>
>>> if 7 <= number < 10:
...     print('large')

7.3.5. Else¶

>>> number = int(input('Type digit: '))  #input: '10'
>>>
>>>
>>> if 0 <= number < 3:
...     print('small')
... elif 3 <= number < 7:
...     print('medium')
... elif 7 <= number < 10:
...     print('large')
... else:
...     print('Not a digit')
Not a digit

7.3.6. Use Case - 0x01¶

>>> language = input('What is your language?: ')  # User input 'Polish'
>>>
>>>
>>> if language == 'English':
...     print('Hello')
... elif language == 'German':
...     print('Guten Tag')
... elif language == 'Polish':
...     print('Witaj')
... else:
...     print("I don't speak this language")
Witaj