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Inventory of 12 variables in the sys library of the Python programming language

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1. Concept

This is a standard library closely related to the Python interpreter.

import sys
print sys.__doc__

shows the basic documentation of sys. Look at the first sentence, which summarizes the basic features of this module.

Inventory of 12 variables in the sys library of the Python programming language

2. sys variables

1. argv

sys.argv is a variable, specially used to pass parameters to the Python interpreter, so it is called "command line parameter".

Method: sys.argvReturn value: list

import sys
print(sys.argv)
#该方法返回的列表中第一个元素为程序的路径,会把执行参数传入到列表中

Inventory of 12 variables in the sys library of the Python programming language

2. path

The search path of the module.

print(sys.path)

The first path in the list represents the current path.

Inventory of 12 variables in the sys library of the Python programming language

3. modules

模块路径字典。

print(sys.modules)
#该方法返回一个字典,模块名为key,模块路径为value

Inventory of 12 variables in the sys library of the Python programming language

4. executable

可执行的二进制文件的绝对路径。

print(sys.executable)

Inventory of 12 variables in the sys library of the Python programming language

5. float_info

浮点信息的结构

print(sys.float_info)
#返回浮点信息的限定范围

Inventory of 12 variables in the sys library of the Python programming language

6. floatreprstyle

字符串表示浮点的repr方法。

print(sys.float_repr_style)

Inventory of 12 variables in the sys library of the Python programming language

7. maxsize

最大支持的长度。

print(sys.maxsize)

Inventory of 12 variables in the sys library of the Python programming language

8. maxunicode

最大编码点

print(sys.maxunicode)

Inventory of 12 variables in the sys library of the Python programming language

9. platform

平台标识符

print(sys.platform)

结果为windows64位的操作系统。

Inventory of 12 variables in the sys library of the Python programming language

10. prefix

python库

print(sys.prefix)
#返回的是python库的路径

Inventory of 12 variables in the sys library of the Python programming language

11. thread_info

线程的实现信息

print(sys.thread_info)
#该变量的使用同float_info类似

Inventory of 12 variables in the sys library of the Python programming language

12. version

Python当前版本。

print(sys.version)

Inventory of 12 variables in the sys library of the Python programming language

三、总结

本文基于Python基础,介绍了sys模块,介绍了12个sys的变量。对每个变量都采用图文结合的方式,进行详细的讲解。

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