[英]What does 'h' mean in a python format string?
This is a valid python format string: 这是一个有效的python格式字符串:
>>> wierd_format = '[%27he]'
>>> print wierd_format % 2.5
[ 2.500000e+00]
But this isn't: 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
Clearly, h
is a supported format character. 显然, h
是受支持的格式字符。 However, the documentation doesn't mention an h
specifier. 但是, 文档没有提到h
说明符。 What does it do? 它有什么作用?
From the docs: 来自文档:
A length modifier (
h
,l
, orL
) may be present, but is ignored as it is not necessary for Python – so eg%ld
is identical to%d
. 可以存在长度修饰符(h
,l
或L
),但忽略它,因为它不是Python所必需的 - 因此例如%ld
与%d
相同。
Python Docs say that it is a length modifier. Python Docs说它是一个长度修饰符。
A length modifier (h, l, or L) may be present, but is ignored as it is not necessary for Python. 可以存在长度修饰符(h,l或L),但忽略它,因为它不是Python所必需的。 so eg %ld is identical to %d. 所以例如%ld与%d相同。
They seem the same, 他们看起来一样,
>>> "[%he]" %2.5
'[2.500000e+00]'
>>> "[%le]" %2.5
'[2.500000e+00]'
>>> "[%Le]" %2.5
'[2.500000e+00]'
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