ArcPY mxd文档另存

import arcpy
import os
import re

from os.path import join, getsize

def getFile(filepath,ext):
    arcpy.env.workspace = filepath
    return arcpy.ListFiles("*"+ext)
def getmxdfile(workspace,ext):
    FileList=[]
    for dirpath, dirnames, filenames in os.walk(workspace):
        for filename in filenames:
            #arcpy.AddMessage("filename=="+filename)

            if filename.lower().endswith(ext):
                fullfile=os.path.join(dirpath, filename)
                arcpy.AddMessage(fullfile)
                FileList.append(fullfile)
    return FileList

inpath  = arcpy.GetParameterAsText(0)
vernum = arcpy.GetParameterAsText(1).upper()

mydir = inpath
a=getmxdfile(mydir,".mxd")

for b in a:
    arcpy.AddMessage(b)
    mxd = arcpy.mapping.MapDocument(b)
    #arcpy.AddMessage("mxd="+str(mxd))
    mxdnew=b.replace('.mxd',vernum+".mxd")
    arcpy.AddMessage("mxdnew:"+mxdnew)
    try:
        mxd.saveACopy( mxdnew,vernum)
    except Exception as e:
          print(e.message)
          # If using this code within a script tool, AddError can be used to return messages
          #   back to a script tool.  If not, AddError will have no effect.
          arcpy.AddError(e.message)
    del mxd