[英]creating a python dictionary from a list and comma separated line
Is there a more elegant way in python
to create a dictionary
from a list
and a cs line
besides a loop? 在
python
,除了循环之外,还有一种更优雅的方法可以从list
和cs line
创建dictionary
吗?
my_master_list = ["ABC", "DEF", "GHI"]
my_list = ["field1", "field2", "field3"]
my_line = "test1,test2,test3"
my_dict = {}
for x in my_master_list:
my_dict[x] = {}
line_parts = my_line.split(",")
n = 0
for y in my_list:
my_dict[x][y] = line_parts[n]
n +=1
print my_dict
# {'ABC': {'field2': 'test2', 'field3': 'test3', 'field1': 'test1'}, 'GHI': {'field2': 'test2', 'field3': 'test3', 'field1': 'test1'}, 'DEF': {'field2': 'test2', 'field3': 'test3', 'field1': 'test1'}}
You can use zip
with a dictionary comprehension : 您可以将
zip
与字典理解一起使用 :
# construct the inner dictionary
d = dict(zip(my_list, my_line.split(",")))
# construct the outer dictionary, if you don't want to make copies, you can use
# {master_key: d ... } directly here just keep in mind they are referring to the same
# object in this way
{master_key: d.copy() for master_key in my_master_list}
#{'ABC': {'field1': 'test1', 'field2': 'test2', 'field3': 'test3'},
# 'DEF': {'field1': 'test1', 'field2': 'test2', 'field3': 'test3'},
# 'GHI': {'field1': 'test1', 'field2': 'test2', 'field3': 'test3'}}
d = {x:dict(zip(my_list, my_line.split(','))) for x in my_master_list}
^ ^ ^
| | [1]--- creates a list from the string
| |
| [2]--- creates a tuple from two lists
|
[3]--- creates a dictionary from the tuples (key, value)
^
|
[4] The overall expression is a dictionary comprehension.
Read about dict comprehensions in PEP274 . 阅读有关PEP274中的 dict理解的信息 。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.