向 matplotlib plot 添加文本时出现 TypeError

Question

I have a csv file that shows some references and their coordinates for some electronic parts:

I've been working about drawing rectangles for these references using matplotlib.pyplot , matplotlib.patches and Rectangle :

import matplotlib.pyplot as plt
import matplotlib.patches as patches
from patches import Rectangle

fig = plt.figure()
ax = fig.add_subplot(111)

I decided to create rectangles for these coordinates and set their "Part ID" from the csv file as their names using plt.text :

n=0

for n in range(30):
    z = df['Part ID'][n]
    rect_n = patches.Rectangle((df['X'][n], df['Y'][n]), 200, 300, fill = False)

(I randomly chose 200 as width and 300 as height. Don't mind that.)

for n in range(30):
    z_n = df['Part ID'][n]
    rect_n = patches.Rectangle((df['X'][n], df['Y'][n]), 200, 300, fill = False)
    ax.add_patch(rect_n)
    plt.text((df['X'][n], df['Y'][n]), 'ID: %s' % (z_n))

df.plot(kind='scatter', x='X', y='Y', ax=ax)
ax.set_axisbelow(True)
ax.grid(linestyle='-', linewidth='2', color='g')

In plt.text row, i tried to name the Rectangles with their Part ID from the csv file. I created a variable z and set the names to z as string. The exact problem starts here:

When i started to run the program, all of the code works fine without naming them as their Part ID.

After this drawing, i decided to add the plt.text row for naming them.

But i get the error: TypeError: text() missing 1 required positional argument: 's'

There is a problem about string assigning in plt.text(.....%s) . Is there anyone that knows what to do?

How can i assign each of them their Part ID names?

Answer 1

The call signature for plt.text is:

plt.text(x, y, s, ...)

Note that x , y , and s are all arguments to this function.

You have used:

plt.text((df['X'][n], df['Y'][n]), 'ID: %s' % (z_n))

where you have given the x, y coordinates as the tuple (df['X'][n], df['Y'][n]) . Remove the parentheses from around them, and it should work just fine:

plt.text(df['X'][n], df['Y'][n], 'ID: %s' % (z_n))

Better yet, to make sure you are giving the correct arguments to the function, you could name the arguments:

plt.text(x=df['X'][n], y=df['Y'][n], s='ID: %s' % (z_n))