负载转换器

此示例演示如何将自定义转换器传递给 numpy.genfromtxt 从CSV文件中提取日期。

出：

loading /tmp/vpy_mat/lib/python3.7/site-packages/matplotlib/mpl-data/sample_data/msft.csv

import dateutil.parser
from matplotlib import cbook
import matplotlib.pyplot as plt
import numpy as np


datafile = cbook.get_sample_data('msft.csv', asfileobj=False)
print('loading', datafile)

data = np.genfromtxt(
    datafile, delimiter=',', names=True,
    dtype=None, converters={0: dateutil.parser.parse})

fig, ax = plt.subplots()
ax.plot(data['Date'], data['High'], '-')
fig.autofmt_xdate()
plt.show()