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from decimal import Decimal
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import re
_parser = re.compile(r"""        # A numeric string consists of:
#    \s*
    (?P<sign>[-+])?              # an optional sign, followed by either...
    (
        (?=\d|\.\d)              # ...a number (with at least one digit)
        (?P<int>\d*)             # having a (possibly empty) integer part
        (\.(?P<frac>\d*))?       # followed by an optional fractional part
        (E(?P<exp>[-+]?\d+))?    # followed by an optional exponent, or...
    |
        Inf(inity)?              # ...an infinity, or...
    |
        (?P<signal>s)?           # ...an (optionally signaling)
        NaN                      # NaN
        (?P<diag>\d*)            # with


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subString
(s,
length):
   
us = unicode(s, 'utf-8
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    gs =
us.encode('gb2312
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    n = int(length)
   
t = gs[:n]
    while True
:
        try
:
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