Working memory and updating processes in reading comprehension

Therefore, the designers of the Python language have published a style guide for Python code, available at , for the purpose of maximizing the readability of code.

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It is crucial to appreciate this difference between modifying an object via an object reference, and overwriting an object reference. We can use it to verify our earlier observations about objects.

First we create a list containing several copies of the same object, and demonstrate that they are not only identical according to This reveals that the second item of the list has a distinct identifier.

If you try running this code snippet yourself, expect to see different numbers in the resulting list, and also the interloper may be in a different position. However, it's really just the type-token distinction, familiar from natural language, here showing up in a programming language. We've actually seen them in the previous chapters, and sometimes referred to them as "pairs", since there were always two members. Like lists and strings, tuples can be indexed Notice in this code sample that we computed multiple values on a single line, separated by commas.

These comma-separated expressions are actually just tuples — Python allows us to omit the parentheses around tuples if there is no ambiguity.

In , storage for the list object must be allocated before the value of max() is computed. , recognizing that humans, not just computers, must read and understand programs.

Here we pick up on some issues of programming style that have important ramifications for the readability of your code, including code layout, procedural vs declarative style, and the use of loop variables.

When writing programs you make many subtle choices about names, spacing, comments, and so on.

When you look at code written by other people, needless differences in style make it harder to interpret the code.

(The underscore is just a regular Python variable, but we can use underscore by convention to indicate that we will not use its value.) We began by talking about the commonalities in these sequence types, but the above code illustrates important differences in their roles.

First, strings appear at the beginning and the end: this is typical in the context where our program is reading in some text and producing output for us to read.

Code layout should use four spaces per indentation level.

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