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使用各种厘米和英寸转换的绘图。这个例子展示了默认单位自检（ax1）的工作原理，如何使用各种关键字设置x和y单位来覆盖默认值（ax2、ax3、ax4），以及如何使用scalars（ax3，假定为当前单位）或units（应用转换将数字转换为当前单位）设置xlimits。
此示例要求 basic_units.py
import numpy as np
from basic_units import cm, inch
import matplotlib.pyplot as plt
cms = cm * np.arange(0, 10, 2)
bottom = 0 * cm
width = 0.8 * cm
fig, axs = plt.subplots(2, 2)
axs[0, 0].bar(cms, cms, bottom=bottom)
axs[0, 1].bar(cms, cms, bottom=bottom, width=width, xunits=cm, yunits=inch)
axs[1, 0].bar(cms, cms, bottom=bottom, width=width, xunits=inch, yunits=cm)
axs[1, 0].set_xlim(2, 6) # scalars are interpreted in current units
axs[1, 1].bar(cms, cms, bottom=bottom, width=width, xunits=inch, yunits=inch)
axs[1, 1].set_xlim(2 * cm, 6 * cm) # cm are converted to inches
fig.tight_layout()
plt.show()