====== Python ======

====== OOP ======

===== Call parent constuctor ======

<code python>super().__init__()</code>

====== String formatting ======

  * using the % operator (old)
<code python>
logger.debug('Got argument %s.' % arg)
</code>

  * str.format (new: string formatters)
<code python>
print("Sammy has {} balloons.".format(5))
print("Sammy has {} and {} balloons.".format(5, 7))
print("Sammy has {0} and {1} balloons.".format(5, 7))
print("Sammy has {1} and {0} balloons.".format(5, 7))
</code>

  * interpolated strings
<code python>
print("{firstname} {lastname}".format(firstname="Horst", lastname="Gutmann"))
</code>

  * new f-strings in Python 3.6
<code python>
name = 'Fred'
age = 42
print(f'He said his name is {name} and he is {age} years old.')
</code>

===== logger =====

Logger is optimized to defer avaluation of arguments until it is needed, so for best performance use ''%'' formating.
Instead of this:
<code python>logger.error('oops caused by %s' % exc)</code>
do that:
<code python>logger.error('oops caused by %s', exc)</code>


====== Exceptions ======
  * [[https://docs.python.org/3/library/exceptions.html#exception-hierarchy|exception-hierarchy]]
  * [[https://stackoverflow.com/questions/2052390/manually-raising-throwing-an-exception-in-python/24065533#24065533|Manually raising (throwing) an exception in Python]]

===== Ignore exception =====

<code python>
try:
    do_something()
except Exception:
    pass
</code>