现有字典d={"a":26,"g":20,"e":20,"c":24,"d":23,"f":21,"b":25} 请按照字段中的value字段进行排序。
d={"a":26,"g":20,"e":20,"c":24,"d":23,"f":21,"b":25} dict(sorted(d.items(),key=lambda x:x[1]))
如何实现字符串的反转?如: name = "wupeiqi" 请反转为 name ="iqiepuw"
#方法一:切片 name="qwer" name=name[::-1] print(name) #方法二:先转成列表,在进行列表翻转 name_list=name.split() name_list.reverse() print(name)
那些情况下, y != x - (x-y)会成立?
1:x y 是非空集合
2:x,y有交集
若k为整型, 下列while循环执行的次数为
k = 1000
while k>1:
print k
k = k/2
C 10次
1000
500
250
125
62
31
15
7
3
1
2: