create a redo cross on a given line in pyplot to indicate where we currently are in python

To create a red cross on a given line in pyplot to indicate the current position, you can use the ax.annotate method from the matplotlib.pyplot module. Here's an example:

main.py
import matplotlib.pyplot as plt

# Create some data
x = [1, 2, 3, 4, 5]
y = [2, 4, 6, 8, 10]

# Create a line plot
plt.plot(x, y)

# Set the current position
current_position = (3, 6)

# Add the red cross annotation
plt.annotate('Current Position', xy=current_position, xytext=(-30, 20),
             textcoords='offset points', arrowprops=dict(arrowstyle='->', color='red'))

# Show the plot
plt.show()
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In this example, we first create a line plot using the plt.plot function. Then, we set the current position of the cross using the current_position variable. Finally, we use the plt.annotate function to add the red cross as an annotation on the plot. The xy parameter specifies the coordinates of the current position, and the xytext parameter specifies the offset of the text label from the cross. The arrowprops parameter controls the appearance of the arrow pointing from the text label to the cross.