How to make an arcpy tool to take multiple inputs csv/text lists, instead of a single input?

Question

It's been only few days that i've been working in python environment.

Based on this code, i've been trying to batch few process for our QAQC task's. At certain times, like when i use Describe.(path_in_a_csv) i am always getting this error "Input value is not valid type". Even here, only with the help of Philip i was able to make the code run successfully. I tried the same thing arcpy.ExportMosaicDatasetPaths_management(path_in_a_csv,"Output"). The error was "not able to execute the tool".

Though i've been trying to understand this for the past couple of days, i couldn't able to crack it. It'll be of great help if anyone shed a bit of light on how to go from here.

import csv
import arcpy
from os import path
csvpath = r"D:\QAQC\Chk_Rep_File_list.csv"
with open(csvpath, "r") as csvfile:
   fcs = [r[0] for r in csv.reader(csvfile)]
for fc in fcs:
   desc = arcpy.Describe(fcs)

RuntimeError: Object: Describe input value is not valid type

Answer 1

This line desc = arcpy.Describe(fcs) should be desc = arcpy.Describe(fc) - you have fcs which is a list of all files from your CSV, and instead it should be fc for each file one at a time (since you're looping through fcs one at a time in the for fc in fcs: loop).

import csv
import arcpy
from os import path
csvpath = r"D:\QAQC\Chk_Rep_File_list.csv"
with open(csvpath, "r") as csvfile:
    fcs = [r[0] for r in csv.reader(csvfile)]
for fc in fcs:
    desc = arcpy.Describe(fc)

    print "Name = {}".format(desc.name)
    print "\tData Type = {}".format(desc.dataType)
    print "\tPath = {}".format(desc.path)

As you had it, you would get no feedback if the script ran successfully. I have added the three print statements at the end to output some results from your Describe.