擅长:python、mysql、java
<p>对于<code>float</code>请查看<a href="http://docs.python.org/library/sys.html#sys.float_info" rel="noreferrer">^{<cd2>}</a>:</p>
<pre><code>>>> import sys
>>> sys.float_info
sys.floatinfo(max=1.7976931348623157e+308, max_exp=1024, max_10_exp=308, min=2.2
250738585072014e-308, min_exp=-1021, min_10_exp=-307, dig=15, mant_dig=53, epsil
on=2.2204460492503131e-16, radix=2, rounds=1)
</code></pre>
<p>具体来说,<code>sys.float_info.max</code>:</p>
<pre><code>>>> sys.float_info.max
1.7976931348623157e+308
</code></pre>
<p>如果不够大,总有<a href="http://docs.python.org/library/functions.html#float" rel="noreferrer">positive infinity</a>:</p>
<pre><code>>>> infinity = float("inf")
>>> infinity
inf
>>> infinity / 10000
inf
</code></pre>
<p>是<a href="http://docs.python.org/library/stdtypes.html#typesnumeric" rel="noreferrer">^{<cd4>} type has unlimited precision</a>,所以我认为你只受可用内存的限制。</p>