>>> import arcpy
... import os
... arcpy.env.workspace = "G:/Verizon_OneFiber/Data/Internal/utility georefs/MuniProvidedShapefiles/Plainfield/W135thStCopydata.gdb"
... arcpy.env.overwriteOutput = True
... outWorkspace = "G:/Verizon_OneFiber/Data/Internal/utility georefs/MuniProvidedShapefiles/Plainfield/W135thStCopy/data_WebMerc.gdb"
... try:
...     for infc in arcpy.ListFeatureClasses():
...         dsc = arcpy.Describe(infc)
...
...         if dsc.spatialReference.Name == "Unknown":
...             print ('skipped this fc due to undefined coord sys: ')
...             print (infc)
...
...         else:
...             #Determine the new outpurt feature class
...             outfc = os.path.join(outWorkspace, infc)
...
...             #Set output coord sys
...             outCS = arcpy.SpatialReference('WGS 1984 Web Mercator Auxiliary Sphere')
...             break
...             #Run project tool
...             arcpy.Project_management(infc, outfc, outCS)
...
...             #Check messages
...             print(arcpy.GetMessages())
...
... except arcpy.ExecuteError:
...     print(arcpy.GetMessages(2))
...
... except Exception as ex:
...     print(ex.args[0])