python字符串 编码及逻辑运算

 

# coding:utf-8

#python2

u = "你好"

print u # utf-8

# 本文件为 utf-8，需要先转为Unicode，然后再转成gbk

uuni = u.decode('utf-8')

print uuni #unicode

gbk = uuni.encode('gbk')

print gbk #gbk code

x = 1

for i in range(5):

x += i

print x

print '5/2={},5.0/2.0={},5//2={},5%2={}'.format((5/2),(5.0/2.0),(5//2),(5%2))

longb = bin(2**64-1+5)

print longb,len(longb)

print 0b1111

print 5&3,5|3,5^3,~3,5<<3,20>>2

#101&011 = 0001 101|011 = 111 ,101^011 =110,~0011= -1100(有符号位)，0101 《3 = 101000（左移 为 intx * 2的位移次方，右移为除以）

print bin(~3)