


Inventory of 12 variables in the sys library of the Python programming language
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.
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
2. path
The search path of the module.
print(sys.path)
The first path in the list represents the current path.
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
4. executable
可执行的二进制文件的绝对路径。
print(sys.executable)
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
6. floatreprstyle
字符串表示浮点的repr方法。
print(sys.float_repr_style)
7. maxsize
最大支持的长度。
print(sys.maxsize)
8. maxunicode
最大编码点
print(sys.maxunicode)
9. platform
平台标识符
print(sys.platform)
结果为windows64位的操作系统。
10. prefix
python库
print(sys.prefix) #返回的是python库的路径
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
12. version
Python当前版本。
print(sys.version)
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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