Quick script to convert all the MXD's in a folder into a particular export type, like a PDF, or JPEG. Automatically picks up all of the files within any folder below the folder specified.

export_mxd.py

import arcpy
import os.path

base_directory = r"C:\temp"
export_type = "PDF"

## Ensure that the export_type exists
if not hasattr(arcpy.mapping, "ExportTo" + export_type.upper()):
    print ("*** You must specify an export type of one of: ***")
    print ("*** AI, BMP, EMF, EPS, GIF, JPEG, PDF, PNG, SVG, TIFF***")
    exit()

def export_mxd(arg, dirname, filenames):
    ## Loop over each filename returned in the filenames list, and export it
    ## if it is a MXD file
    for filename in filenames:
        ## Ensure that the file is really a MXD (has .mxd file extension)
        if filename[-3:].upper() != 'MXD':
            continue
        ## Create the source file path
        source_file = os.path.join(dirname, filename)
        ## Create the destination_file path by adding the
        ## type of export to the end of the file path
        destination_file = os.path.join(dirname, filename + "." + arg)
        print("export {} to {}".format(source_file, destination_file))
        ## Load the MXD
        source_mxd = arcpy.mapping.MapDocument(source_file)
        ## Find the appropriate export method on the arcpy.mapping module
        export_function = getattr(arcpy.mapping, "ExportTo" + arg.upper(), None)
        ## now export
        if export_function:
            export_function(source_mxd, destination_file)
            print ("DONE!")
        else:
            print ("***Something went wrong, we couldn't export the map to a {}".format(arg))
        print ("")

## A special python function that will recusivly search through a directory
## In each directory, the method "export_mxd" is called with the directory
## name and a list of filenames in that directory
## Check out: https://docs.python.org/2/library/os.path.html#os.path.walk
## afor more info
os.path.walk(base_directory, export_mxd, export_type)