python替换开头的连续字符 替换连续的几个字符
>>> a='0000234230000'
>>> ac=re.sub('^0+','',a)
>>> ac
'234230000'
>>> ac=re.sub('0+','',a)
>>> ac
'23423'
>>>
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>>> a='0000234230000'
>>> ac=re.sub('^0+','',a)
>>> ac
'234230000'
>>> ac=re.sub('0+','',a)
>>> ac
'23423'
>>>
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