【Python】Python3.7.3 - sys.flag 命令行选项标志结构序列
文章目录
- Python命令行完整选项
- sys.flag - Python启动命令行选项标志
Python命令行完整选项
https://blog.csdn.net/qq_43401808/article/details/88887356
sys.flag - Python启动命令行选项标志
这是一个只读的结构序列，保存并导出了启动Python时的命令行选项。
# Python 3.7.3
[tony@tony-controller bin]$ ./python3 --version
Python 3.7.3
# 不指定任何选项启动Python
# 除了-R (hash_randomization)启用之外，其他选项皆默认关闭。
[tony@tony-controller bin]$ ./python3
Python 3.7.3 (default, Apr 25 2019, 09:22:47)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-36)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.flags
sys.flags(debug=0, inspect=0, interactive=0, optimize=0, dont_write_bytecode=0, no_user_site=0, no_site=0, ignore_environment=0, verbose=0, bytes_warning=0, quiet=0, hash_randomization=1, isolated=0, dev_mode=False, utf8_mode=0)
>>> quit()
# Python启动时，指定所有选项
# -v：打印出启动时所有的import
[tony@tony-controller bin]$ ./python3 -d -i -I -O -B -s -S -E -v -b -q -R -X dev -X utf8
import _frozen_importlib # frozen
import _imp # builtin
import '_thread' # " , line 1, in <module>
NameError: name 'sys' is not defined
>>> import sys
>>> sys.flags
sys.flags(debug=1, inspect=1, interactive=1, optimize=1, dont_write_bytecode=1, no_user_site=1, no_site=1, ignore_environment=2, verbose=1, bytes_warning=1, quiet=1, hash_randomization=1, isolated=1, dev_mode=True, utf8_mode=1)
>>>