擅长:python、mysql、java
<p>%是模运算符。从<a href="http://docs.python.org/reference/expressions.html" rel="nofollow">docs</a>:</p>
<blockquote>
<p>The % (modulo) operator yields the remainder from the division of the
first argument by the second. The numeric arguments are first
converted to a common type. A zero right argument raises the
ZeroDivisionError exception. The arguments may be floating point
numbers, e.g., 3.14%0.7 equals 0.34 (since 3.14 equals 4*0.7 + 0.34.)
The modulo operator always yields a result with the same sign as its
second operand (or zero); the absolute value of the result is strictly
smaller than the absolute value of the second operand.</p>
</blockquote>