[FIXED] How can I get the x coordinate of a ylabel in matplotlib?

Issue

I have this example:

from numpy import linspace, sin
from matplotlib.pyplot import plot, ylabel, gcf, text

x = linspace(0, 1)
y = x ** 2
plot(x, y)
ylabel("test")

I now want to place some text approximately like "abc" in this figure:

For this, I need the x coordinate of the y-label, or at least approximately. I tried the following:

xd, _ = pyplot.gca().yaxis.get_label().get_transform().transform((0, 0))

But it seems that xd is now always 0 in display coordinates. That is clearly not correct. Furthermore, if I want to transform it back to figure coordinates to display the text:

x, _ = gcf().transFigure.inverted().transform_point((xd, 0))
text(0, 0.5, "abcdefg", transform=gcf().transFigure)

I get this:

So clearly, the x coordinate is not correct.

Solution

Combining the discussion into an answer:

import matplotlib.pyplot as plt

fig, ax = plt.subplots()
ax.set_ylabel("test")
# draw the elements
fig.draw_without_rendering()
# get the position of the ylabel and transform it to coordinates
pos_pixel = ax.yaxis.label.get_tightbbox()
x_coord = ax.transData.inverted().transform((pos_pixel.x0, pos_pixel.y0))[0]
plt.text(x_coord, 0.42, "abc", color="red")
plt.show()

Answered By - Christian Karcher