在Python词典中将每周数据转换为每月数据

尝试这个，

__author__ = 'Fawzan'

dic = {'2007-10-21': '53', '2007-10-28': '50', '2007-11-05': '100', '2007-11-06': '99'}

# create a new dictionary

newDic = {}

# iterate the old dictionary

for key in dic:

# get the desiresd string for comparision
k = key[0:7]

# for debug
print(k)

# if the key is already in the new dictionary, then add the value to existing key
if (k in newDic):
    newDic[k] += float(dic[key])

# else append the key, value
else:
    newDic[k] = float(dic[key])

# print and check the answer :)

print(newDic)