I'm a Blessed https://pypi.python.org/pypi/blessed用户，最近，当我试图找出该内容时term.bold()函数，我得到这个输出：\x1b[1m\x1b(B\x1b[m
我明白什么\x1b[1m and \x1b[m做什么，但是做什么\x1b(B做？我尝试打印它，但它似乎根本没有做任何事情。
提前致谢！
控制序列\x1b(B选择默认字符集 ASCII。看XTerm 控制序列 http://invisible-island.net/xterm/ctlseqs/ctlseqs.html:
ESC ( C Designate G0 Character Set (ISO 2022, VT100).
Final character C for designating 94-character sets. In this
list, 0 , A and B apply to VT100 and up, the remainder to
VT220 and up. The VT220 character sets, together with the
Portuguese character set are activated by the National
Replacement Character controls. The A is a special case,
since it is also activated by the VT300-control for British
Latin-1 separately from the National Replacement Character
controls.
...
C = B -> United States (USASCII).
提供这一点是为了防止终端设置为其他字符集，例如，画线 https://vt100.net/docs/vt102-ug/chapter5.html#T5-15. Blessed https://pypi.python.org/pypi/blessed可能正在检索此作为一部分\x1b(B\x1b[m，例如，在
normal = tigetstr('sgr0')
进一步阅读：
- 如何使用 VT100 获取颜色？ http://invisible-island.net/ncurses/ncurses.faq.html#vt100_color
- VT100.net http://vt100.net/
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