Matplotlib common operations

• Chinese and negative numbers are garbled

plt.rcParams['axes.unicode_minus'] = False  # Solve the problem that the negative sign cannot be displayed normally 
plt.rcParams['font.sans-serif'] = ['SimHei']

• Coordinate axis setting
  • Set the axis range

  plt.xlim([x_min,x_max])
  plt.ylim([y_min,y_max])
  

  • Set the axis scale interval

  ax=plt.gca()# Get the current canvas 
  ax.xaxis.set_major_locator(plt.MultipleLocator(2))
  ax.yaxis.set_major_locator(plt.MultipleLocator(100))
  

• Two sets of data of different types are in the same coordinate system （ The same X Axis , Different y Axis ）

plt.twinx()

• Column related settings

plt.legend(frameon=False,loc=`upper left`,bbox_to_anchor=(0.2,0.4))// Percentage shift right and percentage shift up , Take the bottom left corner as the origin 

loc Possible values