什么是<<在python中代表? [英] What does << represent in python?
问题描述
Python 说
1 << 16 = 65536
<< 在 Python 中执行什么操作?
What operation does << performs in Python?
推荐答案
它是 Python 的左移运算符.顾名思义，左移操作将位向左移动.
It is the left shift operator for Python. A left shift operation, as the name says, move bits to the left.
假设您有 2 个二进制表示为 0010 的对象.所以 2<<2 表示将位向左移动两次:
Suppose you have 2 whose binary representation is 0010.
So 2<<2 means to shift the bits twice to the left:
0010 -> 0100 -> 1000
0010 -> 0100 -> 1000
1000 是 8 的二进制表示.在数学上，左移与将数字乘以 2 的幂相同: a<<b == a*2^b ，但作为运算只通过移位完成，比乘法快得多.
1000 is the binary representation for 8. Mathematically, left shifting is the same as multiplying a number by a power of 2 : a<<b == a*2^b , but as the operation is done only by shifting, it is much faster than doing multiplications.
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