from matplotlib import pyplot as plt
import pandas as pd
import numpy as np

# 设置图形大小
plt.rcParams["figure.figsize"] = [7.00, 3.50]
plt.rcParams["figure.autolayout"] = True

# Pandas dataframe
df = pd.DataFrame(dict(time=list(pd.date_range("2021-01-01 12:00:00", periods=10)), speed=np.linspace(1, 10, 10)))

# 设置 dataframe 索引
df.set_index('time').plot()

# 显示图形
plt.show()