FieldInfo

Summary

Provides field info methods and properties for layer and table views.

Discussion

The FieldInfo object does not support the renaming of fields when the object is used as input to a geoprocessing tool.

Syntax

 FieldInfo  ()

Properties

Property	Explanation	Data Type
count (Read Only)	The field count.	Integer

Method Overview

Method	Explanation
addField (field_name, new_field_name, visible, split_rule)	Add a field info entry
exportToString ()	Exports the object to its string representation.
findFieldByName (field_name)	Finds the field index by field name.
findFieldByNewName (field_name)	Finds the field index by the new field name.
getFieldName (index)	Gets the field name from the table by index position.
getNewName (index)	Returns the new field name from the table by index position.
getSplitRule (index)	Gets the split rule from the table by index position.
getVisible (index)	Returns the visible flag from the table by index position.
loadFromString (string)	Defines a FieldInfo object from a formatted string.
removeField (index)	Removes a FieldInfo entry from a table.
setFieldName (index, field_name)	Sets the field name in the table.
setNewName (index, new_field_name)	Sets a new field name in the table. Note: While the setNewName method updates a field name in the object, the name change will not be applied when the FieldInfo object is used as input to a geoprocessing tool.
setSplitRule (index, rule)	Sets the split rule in the table.
setVisible (index, visible)	Sets the visible policy of a field in the table.

Methods

addField (field_name, new_field_name, visible, split_rule)

Parameter	Explanation	Data Type
field_name	The field name from the input feature class or table.	String
new_field_name	The field name for the new layer or table view.	String
visible	Specifies whether the field will be visible or hidden. VISIBLE—The field will be visible. HIDDEN—The field will be hidden.	String
split_rule	Specifies the behavior of an attribute's values when a feature is split. NONE—The attributes of the two resulting features will take on a copy of the original value. RATIO—The attributes of resulting features will be a ratio of the original feature's value. The ratio is based on the division of the original geometry. If the geometry is divided equally, each new feature's attribute will get one-half of the value of the original object's attribute.	String

exportToString ()

Return Value

Data Type	Explanation
String	The string representation of the object.

findFieldByName (field_name)

Parameter	Explanation	Data Type
field_name	The field name that will be used to find its index position.	String

Return Value

Data Type	Explanation
Integer	The index position.

findFieldByNewName (field_name)

Parameter	Explanation	Data Type
field_name	The new field name that will be used to find its index position.	String

Return Value

Data Type	Explanation
Integer	The index position.

getFieldName (index)

Parameter	Explanation	Data Type
index	The index position.	Integer

Return Value

Data Type	Explanation
String	The field name.

getNewName (index)

Parameter	Explanation	Data Type
index	The index position.	Integer

Return Value

Data Type	Explanation
String	The new field name.

getSplitRule (index)

Parameter	Explanation	Data Type
index	The index position.	String

Return Value

Data Type	Explanation
String	The split rule. NONE—The attributes of the two resulting features will take on a copy of the original value. RATIO—The attributes of resulting features will be a ratio of the original feature's value. The ratio is based on the division of the original geometry. If the geometry is divided equally, each new feature's attribute will get one-half of the value of the original object's attribute.

getVisible (index)

Parameter	Explanation	Data Type
index	The index position.	String

Return Value

Data Type	Explanation
String	The visible flag. VISIBLE—The field will be visible. HIDDEN—The field will be hidden.

loadFromString (string)

Parameter	Explanation	Data Type
string	The string representation of the object. In addition to FieldInfo methods and properties, you can also construct a FieldInfo object from a formatted string. Each field is defined by four space-delimited values. Fields are separated by a semicolon. The name of the input field. The name of the output field (not currently supported). Sets whether the field is visible or hidden. VISIBLE—The field is visible. HIDDEN—The field is hidden. Sets the behavior of an attribute's values when a feature is split. NONE—The attributes of the two resulting features take on a copy of the original value. RATIO—The attributes of resulting features are a ratio of the original feature's value. The ratio is based on the division of the original geometry. If the geometry is divided equally, each new feature's attribute gets one-half of the value of the original object's attribute. import arcpy field_info_str = "fieldA fieldA VISIBLE NONE;fieldB fieldB HIDDEN RATIO" field_info = arcpy.FieldInfo() field_info.loadFromString(field_info_str)	String

removeField (index)

Parameter	Explanation	Data Type
index	The index position of the FieldInfo object.	Integer

setFieldName (index, field_name)

Parameter	Explanation	Data Type
index	The index position.	Integer
field_name	The field name that will be set in the table.	String

setNewName (index, new_field_name)

Parameter	Explanation	Data Type
index	The index position.	None
new_field_name	The new field name that will be set in the table.	String

setSplitRule (index, rule)

Parameter	Explanation	Data Type
index	The index position.	Integer
rule	Specifies the split rule that will be set in the table. NONE—The attributes of the two resulting features will take on a copy of the original value. RATIO—The attributes of resulting features will be a ratio of the original feature's value. The ratio is based on the division of the original geometry. If the geometry is divided equally, each new feature's attribute will get one-half of the value of the original object's attribute.	String

setVisible (index, visible)

Parameter	Explanation	Data Type
index	The index position.	Integer
visible	Specifies the visible policy that will be set in the table. VISIBLE—The field will be visible. HIDDEN—The field will be hidden.	String

Code sample

FieldInfo example

Display FieldInfo object properties for a feature layer.

import arcpy

feature_class = "c:/Data/wells.shp"
layer = "temp_layer"
arcpy.management.MakeFeatureLayer(feature_class, layer)

# Create a describe object
desc = arcpy.Describe(layer)

# Access Describe's fieldInfo property
field_info = desc.fieldInfo

# Use the count property to iterate through all the fields
for index in range(0, field_info.count):
    # Print fieldinfo properties
    print(f"Field Name: {field_info.getFieldName(index)}")
    print(f"\tSplit Rule: {field_info.getSplitRule(index)}")
    print(f"\tVisible:    {field_info.getVisible(index)}")