将字典中的值提取到文件中

Question

我尝试将数据从字典保存到文件，我的代码是：

mapping = {'a': 1, 'c': 5, 'b': 3, 'd': -4}    
values = {'sample1': {'a': 12, 'c': 4, 'b': 10, 'd': 6}, 'sample3': {'a': 3, 'c': 9, 'b': 6, 'd': 10}, 'sample2': {'a': 5, 'c': 6, 'b': 8, 'd': 12}}

for dataset in values:
    for key, value in mapping.items():
        values[dataset][key] += value
    with open(dataset + ".txt", 'w') as out:
        out.write(dataset)
        for key,value in values[dataset]:
            out.write("{0},{1}\n".format(key,value))  

但是当我运行它时，我收到一个错误：

Traceback (most recent call last):
    for key,value in values[dataset]:
ValueError: need more than 1 value to unpack

关于什么是错的任何想法/提示？

干杯，凯特

Answer 1

更改

for key,value in values[dataset]:

到

for key,value in values[dataset].items():

Answer 2

正如其他人所指出的那样，您在的 中缺少项属性。

在不知道你想要完成什么的情况下，我会这样写：

mapping = {'a': 1, 'c': 5, 'b': 3, 'd': -4}
values = {'sample1': {'a': 12, 'c': 4, 'b': 10, 'd': 6}, 'sample3': {'a': 3, 'c': 9, 'b': 6, 'd': 10}, 'sample2': {'a': 5, 'c': 6, 'b': 8, 'd': 12}}

for dataset in values:
    for key, value in mapping.items():
        values[dataset][key] += value
    with open(dataset + ".txt", 'w') as out:
        out.write("{0}\n".format(dataset)) # for formatting purposes
                                           # although you already have it in the file name
        for key, value in values[dataset].items():
            out.write("{0},{1}\n".format(key,value))