基本形式:
sorted(iterable, cmp, key, reverse])
iterable.sort(cmp, key, reverse)
说明:
- 默认是升序排序,即从小到大。
- sort会直接改变list本身,sorted是产生一个排序后的副本不改变原来的list。
基本用法:
x =[4, 6, 2, 1, 7, 9]
y=sorted(x)
print(x)#[4, 6, 2, 1, 7, 9]
print(y)#[1, 2, 4, 6, 7, 9]
x.sort(reverse=True)
print(x)#[9, 7, 6, 4, 2, 1]
分级排序:
alist = [('2', '3', '10'), ('1', '2', '3'), ('5', '6', '7'), ('2', '5', '10'), ('2', '4', '10')]
alist1 = sorted(alist, key=lambda x: (int(x[2]), int(x[1])))
alist.sort(key=lambda x: (int(x[2]), int(x[1])))
print(alist1)
print(alist)
# [('1', '2', '3'), ('5', '6', '7'), ('2', '3', '10'), ('2', '4', '10'), ('2', '5', '10')]