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printf-style Bytes Formatting sometimes do not worked. #75126
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# works.
>>> b'\x00\x08%(amount)b'% {b'amount':b'11111'}
b'\x00\x0811111'
# not work.
>>> b'\x11\x00\x08%(amount)b'% {b'amount':b'11111'}
b'\x11\x00\x08%(amount)b'
# not work.
>>> amount=bytearray(b'000000000010')
>>> posnum=bytearray(b'423')
>>> date_ =b'170717'
>>> time_=b'160006'
>>> b'\x02\x03\x13\x9f\x00\x00\x04NULL\x9f\x01\x00\x01\x02\x9f\x03\x00\x0c\xd6\xd0\xb9\xfa\xd2\xf8\xc1\xaa\xb2\xe2\xca\xd4\x9f\x04\x00\x0f307310083980007\x9f\x05\x00\x0814025520\x9f\x14\x00\x0200\x9f\x19\x00\x08\xbd\xbb\xd2\xd7\xb3\xc9\xb9\xa6\x9f\x07\x00\x0803072900\x9f\x08\x00\n0014243000\x9f\t\x00\x08\xbd\xf0\xbf\xa8\xd6\xd0\xd0\xc4\x9f\n\x00\x0800092900\x9f\r\x00\x06000145\x9f\x0e\x00\x06000081\x9f\x10\x00\x0c162246168268\x9f\x11\x00\x08%(date)s\x9f\x12\x00\x06%(time)s\x9f\x02\x00\x0c%(amount)s\x9f\x1b\x00\x040000\x9f\x0b\x00\x13622452*********2994\x9f\x0c\x00\x01S\x9f\x0f\x00\x00\x9f\x13\x00.FK:\xbb\xb7\xd3\xce\xd1\xc7\xcc\xab\xb3\xa9\xcf\xed\xd2\xf8\xc1\xaa\xd3\xc5\xbb\xdd\nZX:promo.unionpay.com\n\x9f\x1f\x00\x03%(posnum)s\x9f\x1a\x00\x00\x9f\xa1\x00\x01\x01\x9f\xa0\x00\x01\x01\x03\x00'% {b'amount': amount,b'date': date_,b'time': time_,b'posnum': posnum}
b'\x02\x03\x13\x9f\x00\x00\x04NULL\x9f\x01\x00\x01\x02\x9f\x03\x00\x0c\xd6\xd0\xb9\xfa\xd2\xf8\xc1\xaa\xb2\xe2\xca\xd4\x9f\x04\x00\x0f307310083980007\x9f\x05\x00\x0814025520\x9f\x14\x00\x0200\x9f\x19\x00\x08\xbd\xbb\xd2\xd7\xb3\xc9\xb9\xa6\x9f\x07\x00\x0803072900\x9f\x08\x00\n0014243000\x9f\t\x00\x08\xbd\xf0\xbf\xa8\xd6\xd0\xd0\xc4\x9f\n\x00\x0800092900\x9f\r\x00\x06000145\x9f\x0e\x00\x06000081\x9f\x10\x00\x0c162246168268\x9f\x11\x00\x08%(date)s\x9f\x12\x00\x06%(time)s\x9f\x02\x00\x0c%(amount)s\x9f\x1b\x00\x040000\x9f\x0b\x00\x13622452*********2994\x9f\x0c\x00\x01S\x9f\x0f\x00\x00\x9f\x13\x00.FK:\xbb\xb7\xd3\xce\xd1\xc7\xcc\xab\xb3\xa9\xcf\xed\xd2\xf8\xc1\xaa\xd3\xc5\xbb\xdd\nZX:promo.unionpay.com\n\x9f\x1f\x00\x03%(posnum)s\x9f\x1a\x00\x00\x9f\xa1\x00\x01\x01\x9f\xa0\x00\x01\x01\x03\x00' Environment: |
zaazbb
mannequin
added
stdlib
Python modules in the Lib dir
type-bug
An unexpected behavior, bug, or error
labels
Jul 17, 2017
Test case minimization: Python 3.6.1 (default, Apr 24 2017, 06:18:27)
[GCC 4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.42.1)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> b'a\x00%(a)s' % {b'a': b'a'}
b'a\x00%(a)s' It seems that all formatting operations after a zero byte are ignored. This is because the code for parsing the format string (in _PyBytes_FormatEx in Objects/bytesobject.c) uses the following approach to find the next % character: while (--fmtcnt >= 0) {
if (*fmt != '%') {
Py_ssize_t len;
char *pos;
pos = strchr(fmt + 1, '%'); But strchr uses the C notion of strings, which are terminated by a zero byte. |
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