Zusammenfassung
The field object represents a column in a table. A field has many properties, the most obvious ones being its name and its type.
Auswertung
Field properties can be accessed through the ListFields and Describe functions.
Updating a field property only updates the field object, no changes are made to the actual field in the table or feature class.
Syntax
Field ()
Eigenschaften
Eigenschaft | Erklärung | Datentyp |
aliasName (Lesen und schreiben) | The alias name of the field. | String |
baseName (Lesen und schreiben) | The unqualified field name. | String |
defaultValue (Lesen und schreiben) | The default value of the field. | Variant |
domain (Lesen und schreiben) | The name of the associated domain. | String |
editable (Lesen und schreiben) | The editable state: True if the field is editable. | Boolean |
isNullable (Lesen und schreiben) | Indicates if the field can contain null values. | Boolean |
length (Lesen und schreiben) | The length of the field. | Integer |
name (Lesen und schreiben) | The name of the field. | String |
precision (Lesen und schreiben) | The precision for field values. | Integer |
required (Lesen und schreiben) | Indicates if the field is required. A required field cannot be deleted. | Boolean |
scale (Lesen und schreiben) | The scale of the field. | Integer |
type (Lesen und schreiben) | The field type.
Learn more about ArcGIS field data types. | String |
Codebeispiel
Field example
Display field properties for the specified feature class.
import arcpy
feature_class = "c:/data/counties.shp"
# Create a list of fields using the ListFields function
fields = arcpy.ListFields(feature_class)
# Iterate through the list of fields
for field in fields:
# Print field properties
print("Field: {0}".format(field.name))
print("Alias: {0}".format(field.aliasName))
print("Type: {0}".format(field.type))
print("Is Editable: {0}".format(field.editable))
print("Required: {0}".format(field.required))
print("Scale: {0}".format(field.scale))
print("Precision: {0}".format(field.precision))