[英]Subtract dict value from a nested dict if the key exists
基本上,我发出此请求是为了有效地执行操作,但是我想我使用的数据结构不是。
第一个字典:
f_dict = {'n1':{'x':1,'y':1,'z':3},'n2':{'x':6,'y':0, 'z':1}, ...}
s_dict = {'x':3,'t':2, 'w':6, 'y':8, 'j':0, 'z':1}
我想获得e
使得:
e = {'n1':{'x':-2,'y':-7,'z':1},'n2':{'x':3,'y':-8,'z':0}, ...}
您可以使用嵌套字典理解,并使用dict.get
减去值或默认值(在这种情况下为0):
>>> {key: {ikey: ival - s_dict.get(ikey, 0)
... for ikey, ival in i_dct.items()}
... for key, i_dct in f_dict.items()}
{'n1': {'x': -2, 'y': -7, 'z': 2}, 'n2': {'x': 3, 'y': -8, 'z': 0}}
或者,如果您喜欢显式循环:
res = {}
for key, i_dict in f_dict.items():
newdct = {}
for ikey, ival in i_dict.items():
newdct[ikey] = ival - s_dict.get(ikey, 0)
res[key] = newdct
print(res)
# {'n1': {'x': -2, 'y': -7, 'z': 2}, 'n2': {'x': 3, 'y': -8, 'z': 0}}
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.