Python |展平给定的词典列表
给定一个字典列表，任务是将其转换为单个字典，即展平字典列表。 下面给出了几种解决给定任务的方法。 方法#1:使用天真方法
Python 3
# Python code to demonstrate
# to flatten list of dictionaries
# Initialising dictionary
ini_dict = [{'a':1}, {'b':2}, {'c':3}]
# printing initial dictionary
print ("initial dictionary", str(ini_dict))
# code to flatten list of dictionary
res = {}
for d in ini_dict:
res.update(d)
# printing result
print ("result", str(res))
Output:
initial dictionary [{'a': 1}, {'b': 2}, {'c': 3}]
result {'b': 2, 'a': 1, 'c': 3}
方法 2:使用字典理解
Python 3
# Python code to demonstrate
# to flatten list of dictionaries
# Initialising dictionary
ini_dict = [{'a':1}, {'b':2}, {'c':3}]
# printing initial dictionary
print ("initial dictionary", str(ini_dict))
# code to flatten list of dictionary
res = {k: v for d in ini_dict for k, v in d.items()}
# printing result
print ("result", str(res))
Output:
initial dictionary [{'a': 1}, {'b': 2}, {'c': 3}]
result {'a': 1, 'c': 3, 'b': 2}
方法三:利用 减少
Python 3
# Python code to demonstrate
# to flatten list of dictionaries
from functools import reduce
# Initialising dictionary
ini_dict = [{'a':1}, {'b':2}, {'c':3}]
# printing initial dictionary
print ("initial dictionary", str(ini_dict))
# code to flatten list of dictionary
res = reduce(lambda d, src: d.update(src) or d, ini_dict, {})
# printing result
print ("result", str(res))
Output:
initial dictionary [{'a': 1}, {'b': 2}, {'c': 3}]
result {'a': 1, 'c': 3, 'b': 2}
方法#4:使用集合。链图
Python 3
# Python code to demonstrate
# to flatten list of
# dictionaries
from collections import ChainMap
# Initialising dictionary
ini_dict = [{'a':1}, {'b':2}, {'c':3}]
# printing initial dictionary
print ("initial dictionary", str(ini_dict))
# code to flatten list of dictionary
res = ChainMap(*ini_dict)
# printing result
print ("result", str(res))
Output:
initial dictionary [{'a': 1}, {'b': 2}, {'c': 3}]
result ChainMap({'a': 1}, {'b': 2}, {'c': 3})
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