玩命加载中...
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`plt.xlabel(x_axis_name)`可将x-轴的名称改为`x_axis_name`。
同样`plt.ylabel(y_axis_name)`可将y-轴的名称改为`y_axis_name`。
```python
my_title = 'I added names of axes.'
plt.figure(figsize=(5, 3))
plt.plot(x1, y1, lw=3, color='#32bab5', alpha=0.2)
plt.plot(x2, y2, lw=6, color='#32bab5', alpha=0.6)
plt.plot(x2, x2, lw=10, color='#32bab5', alpha=1.0)
plt.title(my_title)
plt.xlabel('this is x-axis')
plt.ylabel('this is y-axis')
plt.show()
```
在每个折线对应的plt.plot里设置`label=label_name`，并且在`plt.show()`之前插入`plt.legdeng()`，我们就可以显示每条线的图例。
```python
my_title = 'I added a legend.'
plt.figure(figsize=(5, 3))
plt.plot(x1, y1, lw=3, color='#32bab5', alpha=0.2, label='square')
plt.plot(x2, y2, lw=6, color='#32bab5', alpha=0.6, label='root')
plt.plot(x2, x2, lw=10, color='#32bab5', alpha=1.0, label='identity')
plt.title(my_title)
plt.xlabel('this is x-axis')
plt.ylabel('this is y-axis')
plt.legend()
plt.show()
```
有时候，图例会遮挡住图的一部分，我们可以设置`plt.legend()`中的参数`loc`来移动图例的位置。
```python
my_title = 'I moved the legend.'
plt.figure(figsize=(5, 3))
plt.plot(x1, y1, lw=3, color='#32bab5', alpha=0.2, label='square')
plt.plot(x2, y2, lw=6, color='#32bab5', alpha=0.6, label='root')
plt.plot(x2, x2, lw=10, color='#32bab5', alpha=1.0, label='identity')
plt.title(my_title)
plt.xlabel('this is x-axis')
plt.ylabel('this is y-axis')
plt.legend(loc=[1.1, 0.5])
plt.show()
```
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