python - Python : Convert named group to integer 中的正则表达式替换

Question

在替换字符串中的模式时，
我特别需要匹配命名组的整数/长值。

案例示例和我的尝试:

status = {1:'foo', 23:'bar'}
re.sub(
    '<status>(?P<id>\d+)',
    status.get(int(r'\g<id>')), # ValueError: invalid literal for int() with base 10: '\\g<id>'
    # status.get(int(r'\g<id>'.decode())), # ValueError: invalid literal for int() with base 10: '\\g<id>'
    # status.get('%d' % r'\g<id>'), # %d format: a number is required, not str
    'Tom ran: from <status>1 to <status>23')

普通转换适用于原始字符串 int(r'22') 但它在上面不起作用？

Answer 1

这应该适合你:

re.sub(
    '<status>(?P<id>\d+)',
    lambda m: status.get(int(m.group('id'))),
    'Tom ran: from <status>1 to <status>23')

If repl is a function, it is called for every non-overlapping occurrence of pattern. The function takes a single match object argument, and returns the replacement string. @ http://docs.python.org/library/re.html#re.sub