使用datetime.datetime对象作为键向csv编写字典

我有一个包含datetime.datetime对象作为键的字典，我想将它们写到一个csv文件中。但是，将引发以下错误：

Traceback (most recent call last):
  File "/Users/macbook/Documents/08_PYTHON/00_PROJECTS/Navps/code/scrape.py", line 179, in <module>
    writer.writerow(data)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/csv.py", line 154, in writerow
    return self.writer.writerow(self._dict_to_list(rowdict))
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/csv.py", line 147, in _dict_to_list
    wrong_fields = rowdict.keys() - self.fieldnames
AttributeError: 'datetime.datetime' object has no attribute 'keys'

这是我的代码如下：

csv_columns = ['Date','Fund Value']
try:
    with open(bof, 'w') as csvfile:
        writer = csv.DictWriter(csvfile, fieldnames=csv_columns)
        writer.writeheader()
        for data in csvdict:
            writer.writerow(data)
except IOError:
    print("I/O error")

这是csvdict的样子：

csvdict = {datetime.datetime(2019, 1, 16, 0, 0): '2.8010', datetime.datetime(2019, 2, 8, 0, 0): '2.8295', datetime.datetime(2019, 2, 7, 0, 0): '2.8326',....}

处理datetime.datetime对象作为键时，我缺少什么吗？我真的很想把日期当作我的钥匙。这根本不可能吗？

注意：如果有帮助，请在Python 3.8上运行此脚本

问题来源：stackoverflow