Python SyntaxError: invalid syntax in plt.text - '=' vs. '=='

This error occurs because the wrong assignment operator "=" is used in the code. In the plt.text function, the assignment operator "=" should be used, not the equality operator "==". The correct code should be:

plt.text(x, y+0.1, str(y), ha='center')

Remember that the equality operator "==" is used to compare if two values are equal, while the assignment operator "=" is used to assign a value to a variable.