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自带库 - sys - 关于python解释器操作

自带库 - sys - 关于python解释器操作

sys 库简介

Python 的 sys 库提供了访问和控制Python解释器的接口。它允许程序与Python解释器交互，如获取命令行参数、管理解释器的运行环境、输出错误信息等。sys 还可以用来执行外部命令、控制标准输入输出和缓冲区大小。这个库在系统编程、脚本开发和调试工具中非常有用，提供了强大的运行时控制能力。

sys库 python解释器操作

  1. from pandas import pd
  2. import time
  3. import sys
  4. import os
  5. # 打印覆盖
  6. for i in range(5):
  7.     # print (i,end="")
  8.     sys.stdout.write("/r %s" % i)
  9.     sys.stdout.flush()
  10.     time.sleep(1)
  12. # 查看包
  13. print (sys.modules)  # 打印，查看该字典具体内容。
  15. print ("当前平台")
  16. print (sys.platform)
  17. # win32
  19. print ("当前Python版本")
  20. print (sys.version)
  21. # 3.6.8 (tags/v3.6.8:3c6b436a57, Dec 24 2018, 00:16:47) [MSC v.1916 64 bit (AMD64)]
  23. print ("默认编码格式")
  24. print (sys.getdefaultencoding())
  25. # utf-8
  27. print ("所有系统模块")
  28. print (sys.modules)
  29. # {"builtins": <module "builtins" (built-in)>, 
  30. # "sys": <module "sys" (built-in)>, 
  31. # "_frozen_importlib": <module "_frozen_importlib" (frozen)>, 
  32. # "_imp": <module "_imp" (built-in)>, 
  33. # "_warnings": <module "_warnings" (built-in)>, 
  34. # "_thread": <module "_thread" (built-in)>, 
  35. # "_weakref": <module "_weakref" (built-in)>, 
  36. # "_frozen_importlib_external": <module "_frozen_importlib_external" (frozen)>, 
  37. # "_io": <module "io" (built-in)>, 
  38. # "marshal": <module "marshal" (built-in)>, 
  39. # "nt": <module "nt" (built-in)>, "winreg": <module "winreg" (built-in)>, 
  40. # "zipimport": <module "zipimport" (built-in)>, 
  41. # "encodings": <module "encodings" from "C:Python36libencodings\__init__.py">, 
  42. # "codecs": <module "codecs" from "C:Python36libcodecs.py">, 
  43. # "_codecs": <module "_codecs" (built-in)>, 
  44. # "encodings.aliases": <module "encodings.aliases" from "C:Python36libencodingsaliases.py">, 
  45. # "encodings.utf_8": <module "encodings.utf_8" from "C:Python36libencodingsutf_8.py">, 
  46. # "_signal": <module "_signal" (built-in)>, 
  47. # "__main__": <module "__main__" from "pp.py">, 
  48. # "encodings.latin_1": <module "encodings.latin_1" from "C:Python36libencodingslatin_1.py">, 
  49. # "io": <module "io" from "C:Python36libio.py">, 
  50. # "abc": <module "abc" from "C:Python36libabc.py">, 
  51. # "_weakrefset": <module "_weakrefset" from "C:Python36lib\_weakrefset.py">, 
  52. # "site": <module "site" from "C:Python36libsite.py">, 
  53. # "os": <module "os" from "C:Python36libos.py">, 
  54. # "errno": <module "errno" (built-in)>, 
  55. # "stat": <module "stat" from "C:Python36libstat.py">, 
  56. # "_stat": <module "_stat" (built-in)>, 
  57. # "ntpath": <module "ntpath" from "C:Python36libtpath.py">, 
  58. # "genericpath": <module "genericpath" from "C:Python36libgenericpath.py">, 
  59. # "os.path": <module "ntpath" from "C:Python36lib    path.py">, 
  60. # "_collections_abc": <module "_collections_abc" from "C:Python36lib\_collections_abc.py">, 
  61. # "_sitebuiltins": <module "_sitebuiltins" from "C:Python36lib\_sitebuiltins.py">, 
  62. # "sysconfig": <module "sysconfig" from "C:Python36libsysconfig.py">}
  64. print ("导入模块及包的查找路径")
  65. print (sys.path)
  66. # ["C:UsersxxxDesktoppy", 
  67. # "C:Python36python36.zip", 
  68. # "C:Python36DLLs", 
  69. # "C:Python36lib", 
  70. # "C:Python36", 
  71. # "C:Python36libsite-packages"]
  72. a = os.path.abspath(__file__)     # 当前文件绝对路径
  73. BASE_DIR = os.path.dirname(a)     # 存放c.py所在的绝对路径
  74. sys.path.append(BASE_DIR)         # 可以加路径
  76. # 脚本后参数
  77. # 用以下命令启动
  78. # python demo.py hello
  79. print ("脚本路径", sys.argv[0])
  80. if len(sys.argv) > 1:
  81.     print ( "脚本后参数为", sys.argv[1:])
  82. else:
  83.     print ("无参数")
  84. # 脚本后参数为 ["hello"]
自带库 - sys - 关于python解释器操作