简述Python的深浅拷贝?
将列表内的元素,根据位数合并成字典
lst = [1,2,4,8,16,32,64,128,256,512,1024,32769,65536,4294967296] # 输出
{
1:[1,2,3,8],
2:[16,32,64],
3:[128,256,512],
4:[1024,],
5:[32769,65536],
6:[4294967296]
} list = [1,2,4,8,16,32,64,128,256,512,1024,32769,65536,4294967296]
dict={}
for i in list:
dict.setdefault(len(str(i)),[]).append(i)
print(dict) ###源码解析
def setdefault(self, *args, **kwargs): # real signature unknown
"""
Insert key with a value of default if key is not in the dictionary. Return the value for key if key is in the dictionary, else default.
"""
pass
###
一行999
print('\n'.join([' '.join(['%s*%s=%-2s' % (y, x, x*y) for y in range(1, x+1)]) for x in range(1, 10)]))
#自叹不如
自己最开始研究的
f'{f'{i}*{j}={i*j}' for j in range(1,i+1)}' for i in range(1,10)