Resumen
Returns the geoprocessing messages from a tool by a specified severity level.
Sintaxis
GetMessages ({severity})| Parámetro | Explicación | Tipo de datos | 
severity  | Specifies the type of messages to be returned. 
 Not specifying a severity level will return all types of messages. (El valor predeterminado es 0)  | Integer | 
| Tipo de datos | Explicación | 
| String | The geoprocessing tool messages, separated by a newline ('\n').  | 
Muestra de código
Returns the geoprocessing messages.
import arcpy
fc = arcpy.GetParameterAsText(0)
arcpy.management.GetCount(fc)
# Print all of the geoprocessing messages returned by the
#  last tool (GetCount)
print(arcpy.GetMessages())