@author jackzhenguo
@desc
@date 2019/2/15将字符串str 当成有效的表达式来求值并返回计算结果取出字符串中内容
In [1]: s = "1 + 3 +5"
In [2]: eval(s)
Out[2]: 9
s = ["{'小汽车':10, '面包车':8}", "{'面包车':5}"]
from collections import defaultdict
d = defaultdict(int)
for item in s:
my_dict = eval(item)
print(type(my_dict))
for key in my_dict:
d[key] += my_dict[key]
print(d)
<class 'dict'>
<class 'dict'>
defaultdict(<class 'int'>, {'小汽车': 10, '面包车': 13})