b= 'oldboy%d%%'%(12,) print(b)
打印12% 需要后面添加2个%
19,简述对象和类的关系
值是某类型,这个值就是这个类的对象
20,all与any区别
all是都空或者都真 则为true
any是有真就是真
21, 为啥用rb,用字节节省空间
22.将‘老男孩’编码为utf-8 编码的字节类型
print("老男孩".encode('utf-8')) print(bytes('老男孩','utf-8'))
25.内置函数globals()和locals()作用
全局变量和局部变量
26 zip函数实现功能
l1=['alex',22,33,44,55] l2=['is',22,33,44,55] l3=['good',22,33,44,55] l4=['guy',22,33,44,55] s=list(zip(l1,l2,l3,l4)) print('_'.join(list(zip(l1,l2,l3,l4))[0])) print(s) a1,a2,a3,a4= zip(*s)#zip(*)为解压 print(list(a1))
alex_is_good_guy
[('alex', 'is', 'good', 'guy'), (22, 22, 22, 22), (33, 33, 33, 33), (44, 44, 44, 44), (55, 55, 55, 55)]
['alex', 22, 33, 44, 55]