Exporting multiple dataframes as images using ArcPy?

Question

I use this code to export a dataframe to png, and it works.

import arcpy
mxd = arcpy.mapping.MapDocument("CURRENT")
df = arcpy.mapping.ListDataFrames(mxd)[0]
ar = df.extent.height / df.extent.width
arcpy.mapping.ExportToPNG(mxd,r"C:\Users\Kakemphaton\Desktop\out.png",df,1024,1024*ar,96,True)

Code from: Writing world file when exporting TIFF using ArcPy Mapping?

This code exports only the first dataframe and always the first. I can't export others and I have multiple dataframes in my mxd (example_1, example_2, example_3). How could I export example_2 and example_3? I tried to activate it for example_2, but it always exports example_1.

Answer 1

List the dataframes, then iterate through them (untested):

import arcpy
mxd = arcpy.mapping.MapDocument("CURRENT")
dataframes = arcpy.mapping.ListDataFrames(mxd)
for df in dataframes:
    ar = df.extent.height / df.extent.width
    arcpy.mapping.ExportToPNG(mxd, r"C:\Users\Kakemphaton\Desktop\" + df.name + ".png",df, 1024, 1024*ar, 96, True)

Answer 2

I like to encourage the use of better string formatting and better ways to join paths. By getting rid of all those plus signs, etc., it will be less likely to encounter such errors - here is a much cleaner approach and it's much nicer to read:

import os    
os.path.join(r"C:\Users\Kakemphaton\Desktop", "{0}.png".format(df.name))