python - python格式字符串中的 'h'是什么意思？

Question

这是一个有效的 python 格式字符串:

>>> wierd_format = '[%27he]'
>>> print wierd_format % 2.5
[        2.500000e+00]

但这不是:

>>> bad_format = '[%20qe]'
>>> print bad_format % 2.5
Traceback (most recent call last):
  File "prog.py", line 5, in <module>
    print bad_format % 2.5
ValueError: unsupported format character 'q' (0x71) at index 4

显然，h 是受支持的格式字符。然而，documentation没有提到 h 说明符。它有什么作用？

Answer 1

来自文档:

A length modifier (h, l, or L) may be present, but is ignored as it is not necessary for Python – so e.g. %ld is identical to %d.