pandas - TypeError：Pandas iloc 函数返回此错误
问题描述
我试图学习一些基本的交易指标并复制这个脚本：
import yfinance as yf
import matplotlib.pyplot as plt
stock = 'TSLA'
start = '2020-11-01'
df = yf.download(stock , start=start)
def MACD(df):
df['EMA12'] = df.Close.ewm(span=12).mean()
df['EMA26'] = df.Close.ewm(span=26).mean()
df['MACD'] = df.EMA12 - df.EMA26
df['signal'] = df.MACD.ewm(span=9).mean()
print('indicators added')
MACD(df)
plt.plot(df.signal, label='signal', color='red')
plt.plot(df.MACD, label='MACD', color='green')
plt.legend()
plt.show()
Buy, Sell = [], []
for i in range(2, len(df)):
if df.MACD.iloc[i] > df.signal.iloc[i] and df.MACD.iloc[i-1] < df.signal.loc[i-1]:
Buy.append(i)
elif df.MACD.iloc[i] < df.signal.iloc[i] and df.MACD.iloc[i-1] > df.signal.iloc[i-1]:
Sell.append(i)
当我尝试调用 Buy 或 Sell 列表时，我收到此错误返回：
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-3-140f9fd1549f> in <module>
26
27 for i in range(2, len(df)):
---> 28 if df.MACD.iloc[i] > df.signal.iloc[i] and df.MACD.iloc[i-1] < df.signal.loc[i-1]:
29 Buy.append(i)
30 elif df.MACD.iloc[i] < df.signal.iloc[i] and df.MACD.iloc[i-1] > df.signal.iloc[i-1]:
~\anaconda3\lib\site-packages\pandas\core\indexing.py in __getitem__(self, key)
1765
1766 maybe_callable = com.apply_if_callable(key, self.obj)
-> 1767 return self._getitem_axis(maybe_callable, axis=axis)
1768
1769 def _is_scalar_access(self, key: Tuple):
~\anaconda3\lib\site-packages\pandas\core\indexing.py in _getitem_axis(self, key, axis)
1961
1962 # fall thru to straight lookup
-> 1963 self._validate_key(key, axis)
1964 return self._get_label(key, axis=axis)
1965
~\anaconda3\lib\site-packages\pandas\core\indexing.py in _validate_key(self, key, axis)
1828
1829 if not is_list_like_indexer(key):
-> 1830 self._convert_scalar_indexer(key, axis)
1831
1832 def _is_scalar_access(self, key: Tuple) -> bool:
~\anaconda3\lib\site-packages\pandas\core\indexing.py in _convert_scalar_indexer(self, key, axis)
738 ax = self.obj._get_axis(min(axis, self.ndim - 1))
739 # a scalar
--> 740 return ax._convert_scalar_indexer(key, kind=self.name)
741
742 def _convert_slice_indexer(self, key: slice, axis: int):
~\anaconda3\lib\site-packages\pandas\core\indexes\datetimelike.py in _convert_scalar_indexer(self, key, kind)
384 is_flt = is_float(key)
385 if kind in ["loc"] and (is_int or is_flt):
--> 386 self._invalid_indexer("index", key)
387 elif kind in ["ix", "getitem"] and is_flt:
388 self._invalid_indexer("index", key)
~\anaconda3\lib\site-packages\pandas\core\indexes\base.py in _invalid_indexer(self, form, key)
3075 """
3076 raise TypeError(
-> 3077 f"cannot do {form} indexing on {type(self)} with these "
3078 f"indexers [{key}] of {type(key)}"
3079 )
TypeError: cannot do index indexing on <class 'pandas.core.indexes.datetimes.DatetimeIndex'> with these indexers [1] of <class 'int'>
有人可以给我一个提示，这个错误实际上意味着什么？
我的意思是我得到了代码，但无法理解那个错误。
为什么不能索引？或者在列表中写入更多内容？