A function should only do one thing. If flags are used as a function’s parameters, the function is doing more than one thing.
When you find yourself using flags as a way to run different code, consider splitting your function into different functions.
A function should do only one task, not multiple tasks. The function process_data tries to do multiple tasks such as adding new features, adding one, and taking a sum of all columns. Using comments helps explain each block of code, but it takes a lot of work to keep the comments up-to-date. It is also difficult to test each unit of code inside a function.
A better practice is to split the function process_data into smaller functions that do only one thing. In the code below, I split the function process_data into 4 different functions and apply these functions to a pandas DataFrame in order using pipe.
Besides getting a random number, you can also get a random element from a Python list using random. In the code above, “watch movie” was picked randomly from a list of options.
random.choice: Get a Randomly Selected Element from a Python List Read More »
If you want to reverse a dictionary (turn keys into values and vice versa), use the combination of items() and dictionary comprehension.
Reverse a Dictionary with Dictionary Comprehension Read More »
Normally, using / will perform a true division. If you want to perform a floor division, use //.
Perform Floor Division with Double Forward Slash Read More »
It is lengthy to write multiple OR operators. You can shorten your conditional statement by using in instead.
In the code above, Orange is a subclass of Fruit. How do we use type hint to specify that fruit_type in make_fruit should be a subclass of Fruit?
Using a parent class as a type hint will give you a type error when using mypy. Use typing.Type instead.
Using str.split only allows you to split a string by one character. If you want to split a string by multiple characters, use re.split().
re uses regrex to split the string.
When printing a Python string, f-strings allow you to format datetime easily with a curly bracket and its formats.
Find all formats here.
While writing code, we should avoid duplication because:
It is redundant
If we make a change to one piece of code, we need to remember to make the same change to another piece of code. Otherwise, we will introduce bugs into our code.
In the code above, we use the filter X['date'] > date(2021, 2, 8) twice. To avoid duplication, we can assign the repeated code to a variable or a function.