d:\download\anaconda3\envs\tensorflow\lib\site-packages\pandas\core\frame.py in groupby(self, by, axis, level, as_index, sort, group_keys, squeeze, observed, dropna) 6523 squeeze=squeeze, 6524 observed=observed, -> 6525 dropna=dropna, 6526 ) 6527 d:\download\anaconda3\envs\tensorflow\lib\site-packages\pandas\core\groupby\groupby.py in __init__(self, obj, keys, axis, level, grouper, exclusions, selection, as_index, sort, group_keys, squeeze, observed, mutated, dropna) 531 observed=observed, 532 mutated=self.mutated, --> 533 dropna=self.dropna, 534 ) 535 d:\download\anaconda3\envs\tensorflow\lib\site-packages\pandas\core\groupby\grouper.py in get_grouper(obj, key, axis, level, sort, observed, mutated, validate, dropna) 784 in_axis, name, level, gpr = False, None, gpr, None 785 else: --> 786 raise KeyError(gpr) 787 elif isinstance(gpr, Grouper) and gpr.key is not None: 788 # Add key to exclusions

这段错误信息主要是显示在调用groupby方法时出现了KeyError，即指定的分组列名不在数据集中。

可能原因是你指定的分组列名‘日期’不存在于数据集的列名之中，或者是数据集的列名中包含空格或其他特殊字符，导致无法正确识别。

建议检查一下数据集中的列名，确认是否正确指定了分组列名，并且尽量避免在列名中使用特殊字符和空格。

相关问题

Traceback (most recent call last): File "D:\PythonProject\数据分析\plot.py", line 39, in <module> dfgroup2.plot(kind="bar") File "D:\anaconda3\lib\site-packages\pandas\plotting\_core.py", line 1000, in __call__ return plot_backend.plot(data, kind=kind, **kwargs) File "D:\anaconda3\lib\site-packages\pandas\plotting\_matplotlib\__init__.py", line 71, in plot plot_obj.generate() File "D:\anaconda3\lib\site-packages\pandas\plotting\_matplotlib\core.py", line 451, in generate self._setup_subplots() File "D:\anaconda3\lib\site-packages\pandas\plotting\_matplotlib\core.py", line 512, in _setup_subplots fig = self.plt.figure(figsize=self.figsize) File "D:\anaconda3\lib\site-packages\matplotlib\_api\deprecation.py", line 454, in wrapper return func(*args, **kwargs) File "D:\anaconda3\lib\site-packages\matplotlib\pyplot.py", line 813, in figure manager = new_figure_manager( File "D:\anaconda3\lib\site-packages\matplotlib\pyplot.py", line 382, in new_figure_manager _warn_if_gui_out_of_main_thread() File "D:\anaconda3\lib\site-packages\matplotlib\pyplot.py", line 360, in _warn_if_gui_out_of_main_thread if _get_required_interactive_framework(_get_backend_mod()): File "D:\anaconda3\lib\site-packages\matplotlib\pyplot.py", line 208, in _get_backend_mod switch_backend(rcParams._get("backend")) File "D:\anaconda3\lib\site-packages\matplotlib\pyplot.py", line 331, in switch_backend manager_pyplot_show = vars(manager_class).get("pyplot_show") TypeError: vars() argument must have __dict__ attribute

这个错误通常是因为你的matplotlib库的backend没有正确设置，或者你的代码在非交互式环境中运行。你可以尝试在代码的开头添加下面这行代码来设置matplotlib的backend：

import matplotlib
matplotlib.use('TkAgg')

这里的'TkAgg'是一种常用的backend，你也可以根据自己的需要选择其他的backend。如果你已经设置了backend，但仍然出现这个错误，那么可能是你的代码在非交互式环境中运行。你可以尝试在交互式环境中运行代码，或者使用plt.savefig()函数将图像保存到文件中，而不是在窗口中显示。

Traceback (most recent call last): File "F:\pythonproject\ARIMA-GRACH\3.py", line 15, in <module> data = data.asfreq('D') File "E:\anaconda\lib\site-packages\pandas\core\frame.py", line 10517, in asfreq return super().asfreq( File "E:\anaconda\lib\site-packages\pandas\core\generic.py", line 7697, in asfreq return asfreq( File "E:\anaconda\lib\site-packages\pandas\core\resample.py", line 2096, in asfreq new_obj = obj.reindex(dti, method=method, fill_value=fill_value) File "E:\anaconda\lib\site-packages\pandas\util\_decorators.py", line 324, in wrapper return func(*args, **kwargs) File "E:\anaconda\lib\site-packages\pandas\core\frame.py", line 4804, in reindex return super().reindex(**kwargs) File "E:\anaconda\lib\site-packages\pandas\core\generic.py", line 4966, in reindex return self._reindex_axes( File "E:\anaconda\lib\site-packages\pandas\core\frame.py", line 4623, in _reindex_axes frame = frame._reindex_index( File "E:\anaconda\lib\site-packages\pandas\core\frame.py", line 4642, in _reindex_index return self._reindex_with_indexers( File "E:\anaconda\lib\site-packages\pandas\core\generic.py", line 5032, in _reindex_with_indexers new_data = new_data.reindex_indexer( File "E:\anaconda\lib\site-packages\pandas\core\internals\managers.py", line 679, in reindex_indexer self.axes[axis]._validate_can_reindex(indexer) File "E:\anaconda\lib\site-packages\pandas\core\indexes\base.py", line 4107, in _validate_can_reindex raise ValueError("cannot reindex on an axis with duplicate labels")

这是一个 ValueError 异常，提示不能在一个有重复标签的轴上重新索引。这可能是因为你的数据框中有重复的日期标签。你可以使用 `duplicated()` 方法检查日期标签是否有重复值，并使用 `drop_duplicates()` 方法删除重复的日期标签。例如：

# 检查日期标签是否有重复值
print(data.index.duplicated())

# 删除重复的日期标签
data = data[~data.index.duplicated()]