plot_image.py: add positional argument specifiers to .format() calls

For backwards compatibility with Python 2.6.

diff --git a/src/plot_image/plot_image.py b/src/plot_image/plot_image.py
index b387e6d0165e516633ea96598cf2b33dc4430733..8510e8e940bb6699d610586a73a8a11021c5d805 100755 (executable)
--- a/src/plot_image/plot_image.py
+++ b/src/plot_image/plot_image.py
@@ -286,11 +286,11 @@ def main(argv=None):
 
     Z_min = numpy.min(Z.flat)
     Z_max = numpy.max(Z.flat)
-    print('X range:           {} {} ({} steps)'.format(
+    print('X range:           {0} {1} ({2} steps)'.format(
         X[0,0], X[0,-2], X.shape[1]))
-    print('Y range:           {} {} ({} steps)'.format(
+    print('Y range:           {0} {1} ({2} steps)'.format(
         Y[0,0], Y[-2,0], Y.shape[0]))
-    print('Z range:           {} {}'.format(Z_min, Z_max))
+    print('Z range:           {0} {1}'.format(Z_min, Z_max))
 
     fig = plot(X, Y, Z, full=options.full, title=options.title,
                contours=options.contours, interpolation=options.interpolation,