matplotlib coordinates format [duplicate]

Answer 1

The ax.fmt_xdata attribute can be set to a function that formats the displayed string.

For example:

ax.fmt_xdata = lambda x: "{0:f}".format(x)
ax.fmt_ydata = lambda x: "{0:f}".format(x)

Answer 2

You can also completely override the default labeling by setting format_coord

ax.format_coord = lambda x, y: "({0:f}, ".format(y) +  "{0:f})".format(x)

example, api doc