Python (I)

Python characteristic ：1、python It's a completely object-oriented language .

1. python Has a strong library of standards .
2. python The community provides a large number of third-party modules .

Python Advantages and disadvantages ：

Python The advantages of ：1、 Simple 、 studies of the Book of Changes .

1. free 、 Open source .
2. object-oriented .
3. Rich library .
4. Extensibility .

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Python The shortcomings of ：1、 The running speed is not ideal .

1. The domestic market is smaller .
2. Lack of Chinese materials .

Python The basic concept of source program ：

1. python The source program is a special format text file , You can use any text editing software to do python Development of .
2. python The file extension of a program is usually .py.

Python Novice error for ：1、 Hand error .

2、 There will be more than one print Write in a line .

1. The indentation error .

            Be careful ：python Is a very strict format programming language , For now , Do not precede each line of code with a space .

Python notes ： Use... For single line comments #.

             Multi line comment “““””” Or three single quotes .

Arithmetic operator ：

Priority of arithmetic operators ：1、 First multiply, then divide, then add or subtract .

1. Sibling operators are evaluated from left to right .
2. have access to （） Adjust the priority of the calculation .

The arithmetic priority is arranged from high to low ：