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programming:python [2017/08/07 22:29] niziak |
programming:python [2020/07/03 09:51] (current) niziak ↷ Page moved from python to programming:python |
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| + | ====== Python ====== | ||
| + | |||
| + | ====== OOP ====== | ||
| + | |||
| + | ===== Call parent constuctor ====== | ||
| + | |||
| + | <code python>super().__init__()</code> | ||
| + | |||
| ====== String formatting ====== | ====== String formatting ====== | ||
| Line 18: | Line 26: | ||
| print("{firstname} {lastname}".format(firstname="Horst", lastname="Gutmann")) | print("{firstname} {lastname}".format(firstname="Horst", lastname="Gutmann")) | ||
| </code> | </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 ====== | ====== Exceptions ====== | ||