Pandas 注册一个转换器 https://github.com/pydata/pandas/blob/master/pandas/tseries/converter.py#L27 in matplotlib.units.registry
它转换许多日期时间类型(例如 pandas DatetimeIndex 和 dtype 的 numpy 数组)datetime64
)到 matplotlib datenums,但它不处理 PandasSeries
与数据类型datetime64
.
In [67]: import pandas.tseries.converter as converter
In [68]: c = converter.DatetimeConverter()
In [69]: type(c.convert(df['Date'].values, None, None))
Out[69]: numpy.ndarray # converted (good)
In [70]: type(c.convert(df['Date'], None, None))
Out[70]: pandas.core.series.Series # left unchanged
fill_between
检查并使用转换器来处理数据(如果存在)。
因此,作为解决方法,您可以将日期转换为 NumPy 数组datetime64
's:
d = data['Date'].values
plt.fill_between(d, data['A'], data['B'],
where=data['A'] >= data['B'],
facecolor='green', alpha=0.2, interpolate=True)
例如,
import numpy as np
import matplotlib.pyplot as plt
import pandas as pd
N = 300
dates = pd.date_range('2000-1-1', periods=N, freq='D')
x = np.linspace(0, 2*np.pi, N)
data = pd.DataFrame({'A': np.sin(x), 'B': np.cos(x),
'Date': dates})
plt.plot_date(data['Date'], data['A'], '-')
plt.plot_date(data['Date'], data['B'], '-')
d = data['Date'].values
plt.fill_between(d, data['A'], data['B'],
where=data['A'] >= data['B'],
facecolor='green', alpha=0.2, interpolate=True)
plt.xticks(rotation=25)
plt.show()