Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
Type Annotation in Python
Tips and Traps¶
Type hints cheat sheet (Python 3) is a quick cheat sheet showing how the PEP 484 type annotation notation represents various common types in Python 3.
Notice that the annotation on List and Tuple are different.
List[T]stands for a variable length list of elements with typeT
Operators in Different Programming Languages
| Python | Bash | C/C++ | Java | Julia | |
|---|---|---|---|---|---|
| and | and | -a | && | && | && |
| or | or | -o | || | || | || |
| not | not | ! | ! | ! | ! |
| bit and | & | & | & | & | & |
| bit or | | | | | | | | | | |
| bit not | ~ | ~ | ~ | ~ | ~ |
| bit xor | ^ | ^ | ^ | ^ | ^ |
| vector and | |||||
| vector or | |||||
| vector not | |||||
| equals | == | -eq | == | == | == |
| not equal | != | -ne | != | != | != |
| greater than | > | -gt | > | > | > |
| less than | < | -lt | < | < | < |
| greater than or equal to | >= | -ge | >= | >= | >= |
| less than or equal to … |
Tips on pylint
Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
Tips and Traps
Optional Pylint checkers in the extensions module
Message Control
-
Show ERROR messages only.
pylint -E some_script.py -
Show ERROR and WARNING messages only.
pylint --disable=R,C some_script …
Write Unit Tests Using PyTest in Python
Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
Run pytest in the root directory of your project to run all test suites.
You can run test cases in a specific test file (e.g., test_file.py)
using the command …
Use Flake8 to Lint Python Scripts
Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
Configration
It is suggested that you put the configuration into a file named .flake8
in the root directory of your project.
When flake8 supports pyproject.toml later,
it is best to …