Rivalry2

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Original 2026-01-01

Modified 2026-02-21

1 In this lesson, we will look at how to combine different approaches when writing code. Also, we will cover common beginner errors.

2 Here we have the following code:

3 It prints tirion on the screen.

4 All operations above are familiar, but we see several consecutive periods for the first time. This code combines the Python features that we currently know.

5 It often happens in programming. When you do not know the syntax, you can combine different approaches. There is a chance they will work.

6 Let us figure out how this code works. We need to break down the chain into separate operations:

7 The first and second examples are equivalent. We can choose from two options:

8 <ul><li>Perform operations sequentially by creating intermediate variables</li>

9 <li>Build a continuous chain of attributes and methods that goes from left to right, like computations in chains always do</li>

10 </ul>Here you see another example to get across the idea:

11 This code needs a lot of thought. The .lower() function applies to the result of the method call, which is on the left. And the replace() method returns a string.

12 Beginners often make mistakes in method chains and forget to place a call:

13 Do not forget about the risk of building infinitely long and useless chains with slices:

14 It will not work with functions since programmers usually nest them inside each other - f(f(f())). It makes the analysis much more difficult. But it doesn't mean we cannot do it nicely. We can implement this feature in other languages through a function composition or a pipelining operator.