Python Study Notes-03

Oct 21, 2019#Python48

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This is a summary of the given text in "en" language: The text discusses Python program files and modules. It explains that a module is a program file containing pre-written statements and can be directly run as a script. Python programs can be broken down into modules, statements, expressions, and objects. Modules contain statements, statements contain expressions, and expressions create and manipulate objects. The text also mentions that statements change things, such as assignment statements changing variables and print statements changing screen output. It further explains the concepts of procedural and object-oriented programming, with procedural programming focusing on instructions and data processing, while object-oriented programming focuses on data and organizing code around it.

Python Program File Structure

Python Program Files#

This type of Python files contains a series of pre-written statements called "modules".

Modules that can be directly executed are usually called scripts (i.e., the top-level files of a program).

Python programs can be decomposed into modules, statements, expressions, and objects#

Programs are composed of modules.

Modules contain statements.

Statements contain expressions.

Expressions create and manipulate objects.

Expressions are "something", while statements are "do something" (i.e., instructions);
- For example, "3+4" is something, while the statement "print 3+4" is doing something;
Characteristics of statements: they change things. For example, an assignment statement changes a variable, a print statement changes the screen output, etc.

Procedural and Object-Oriented#

Procedural:

Instruction-centered, with instructions processing data. It is about how to organize code to solve problems.

Object-Oriented:

Data-centered, with all processing code revolving around data. It is about designing data structures to organize data and providing operations to manipulate such data.