Python Tips

AND and OR operators are useful when you want to connect two Boolean expressions into one expression. The code above shows the difference between using | (or) and using & (and).
Link to the source code.

If you want to create a string representation of an object, add __str__ and __repr__.
__str__ shows readable outputs when printing the object. __repr__ shows outputs that are useful for displaying and debugging the object.
Find an example of these two methods above.
Link to the source code.

If you want to find the index of a substring in a string, use find() method. This method will return the index of the first occurrence of the substring if found and return -1 otherwise.
You can also provide the starting and stopping position of the search as shown above.
Link to the source code.

If you want to add indentation to your JSON file to improve readability, add indent parameter to json.dumps method.
The code above shows the output of json.dumps method after adding indent=4.

If you want to get multiples of a number, use the modulus operator %. The modulus operator is used to get the remainder of a division. For example, 4 % 3 = 1, 5 % 3 = 2.
Thus, to get multiples of n, we select only numbers whose remainders are 0 when dividing them by n. The code above shows how it works.
Link to the source code.

If you want to import only specific Python objects when using import *, insert __all__ in the script that Python objects are imported from.
The code above is an example of using __all__.

To assign items of a Python iterables (such as list, tuple, string) to different variables, you can unpack the iterable like above.
Link to the source code.

If you want to extract n max values from a large Python list, using heapq will speed up the code.
In the code above, using heapq is 2.503 times faster than using sorting and indexing. Both methods try to find the max values of a list of 10000 items.
Link to the source code.