Field

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 field's length.	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 field's scale.	Integer
type (Lesen und schreiben)	The field type. Blob —Blob Date —Date Double —Double Geometry —Geometry GlobalID —Global ID Guid —Guid Integer —Integer (Long Integer) OID —Object ID Raster —Raster Single —Single (Float) SmallInteger —Small Integer (Short Integer) String —String (Text) Hinweis: The field object's type property does not match completely with the choices listed for the Add Field tool's field_type parameter. To allow the Add Field tool to use all type keywords, field types are mapped: Integer to LONG, String to TEXT, and SmallInteger to SHORT.	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))