Improve validation error

Author: forsyth2

tests/integration/template_complete_run.cfg

@@ -13,7 +13,7 @@ www = "#expand user_www#zppy_test_complete_run_www"
 [climo]
 active = True
 walltime = "00:30:00"
-years = "1850:1854:2", "1850:1854:4",
+years = "1850:1854:2", "1850:1854:4"
 
   [[ atm_monthly_180x360_aave ]]
   frequency = "monthly"
@@ -25,9 +25,9 @@ years = "1850:1854:2", "1850:1854:4",
   vars = "PRECT"
 
 [ts]
-active = True
+active = 4
 walltime = "00:30:00"
-years = "1850:1854:2",
+years = "1850:1854:2"
 
   [[ atm_monthly_180x360_aave ]]
   frequency = "monthly"

zppy/__main__.py

@@ -1,6 +1,7 @@
 import argparse
 import errno
 import os
+import pprint
 from typing import List
 
 from configobj import ConfigObj
@@ -167,8 +168,12 @@ def _validate_config(config):
     validator = Validator()
 
     result = config.validate(validator)
+    print(type(result))
     if result is not True:
-        print("Validation results={}".format(result))
+        printer = pprint.PrettyPrinter(depth=3)
+        print("Validation results:")
+        printer.pprint(result)
+        # print("Validation results={}".format(result))
         raise ValueError(
             "Configuration file validation failed. Parameters listed as false in the validation results have invalid values."
         )