对List、Dict进行排序,Python提供了两个方法
--------------------------------sorted---------------------------------------
sorted(iterable, key=None, reverse=False)
Return a new list containing all items from the iterable in ascending order.
A custom key function can be supplied to customise the sort order, and the
reverse flag can be set to request the result in descending order.
-----------------------------------------------------------------------------参数说明:iterable:是可迭代类型;key:传入一个函数名,函数的参数是可迭代类型中的每一项,根据函数的返回值大小排序;reverse:排序规则. reverse = True 降序 或者 reverse = False 升序,有默认值。返回值:有序列表
例:
列表按照其中每一个值的绝对值排序
l1 = [1,3,5,-2,-4,-6]
l2 = sorted(l1,key=abs)
print(l1)
print(l2)
列表按照每一个元素的len排序
l = [[1,2],[3,4,5,6],(7,),'123']
print(sorted(l,key=len))