Python Tutorial【Python快速入门教程】

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Python Tutorial

Tutorialspoint.com

Python is a general purpose interpreted, interactive, object-oriented and high-level

Python is a high-level, interpreted, interactive and object oriented-scripting language.

Python was developed by Guido van Rossum in the late eighties and early nineties at the

National Research Institute for Mathematics and Computer Science in the Netherlands.

Python's feature highlights include:

Getting Python:

The most up-to-date and current source code, binaries, documentation, news, etc. is available

at the official website of Python:

Python Official Website : http://www.python.org/

You can download the Python documentation from the following site. The documentation is

available in HTML, PDF, and PostScript formats.

Python Documentation Website : www.python.org/doc/

First Python Program:

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Type the following text to the right of the Python prompt and press the Enter key:

This will produce following result:

Python Identifiers:

A Python identifier is a name used to identify a variable, function, class, module, or other

Reserved Words:

The following list shows the reserved words in Python. These reserved words may not be used

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However, the second block in this example will generate an error:

Multi-Line Statements:

Statements in Python typically end with a new line. Python does, however, allow the use of the

character. For example:

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Quotation in Python:

Python accepts single ('), double (") and triple (''' or """) quotes to denote string literals, as long

The triple quotes can be used to span the string across multiple lines. For example, all the

following are legal:

This will produce following result:

A comment may be on the same line after a statement or expression:

You can comment multiple lines as follows:

Using Blank Lines:

A line containing only whitespace, possibly with a comment, is known as a blank line, and

Python totally ignores it.

In an interactive interpreter session, you must enter an empty physical line to terminate a

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header line and a suite.

Header lines begin the statement (with the keyword) and terminate with a colon ( : ) and are

followed by one or more lines which make up the suite.

Python - Variable Types:

Variables are nothing but reserved memory locations to store values. This means that when you

create a variable you reserve some space in memory.

Based on the data type of a variable, the interpreter allocates memory and decides what can be

stored in the reserved memory. Therefore, by assigning different data types to variables, you