Arcgis10.5 python按属性分割图层，属性相同分为一个图层

# coding=utf-8
"""
Source code for potential gp tool to create outputs based on attributes
of an input.
"""

import arcpy
import numbers
import sys

try:
unicode
except:
unicode = str

def get_unique_values(in_data, fields):
"""
Identify all unique values for field(s) in a data source

:param in_data: Input data source
:param fields: Field name
:return: A list of unique values
"""

# Respect extent environment where possible
if arcpy.env.extent:
lyr_name = 'sbyloc_extent'
try:
lyr = arcpy.MakeFeatureLayer_management(in_data, lyr_name)[0]
arcpy.SelectLayerByLocation_management(lyr, 'INTERSECT',
arcpy.env.extent.polygon)
in_data = lyr_name
except arcpy.ExecuteError:
pass

table_name = arcpy.CreateUniqueName('freq', 'in_memory')
arcpy.Frequency_analysis(in_data, table_name, fields)
atts = [r for r in arcpy.da.SearchCursor(table_name, fields)]

try:
arcpy.Delete_management(table_name)
except arcpy.ExecuteError:
# Should delete, but don't fail for intermediate data issues
pass

return atts

def create_name(workspace, name, extension):
"""
Create a unique name

:param workspace: The workspace that an expected output will be written to
:param name: Base name of the output (list)
:param extension: Extension including the leading period
:return: A unique name, including pathname
"""

name = u'_'.join([unicode(i) for i in name])

name = name.replace('"', '')
name = name.replace("'", "")

if name == '':  # name of '' validated to ''
name = 'T'

validated_name = u'{}{}'.format(
arcpy.ValidateTableName(name, workspace),
extension)

unique_name = arcpy.CreateUniqueName(validated_name, workspace)

return unique_name

def create_expression(in_data, field_name, value):
"""
Create a SQL Expression

:param in_data: Input data source
:param field_name: The field name that will be queried
:param value: The value in the field that will be queried for
:return: SQL expression
"""

delimited_field = arcpy.AddFieldDelimiters(in_data, field_name)
if isinstance(value, numbers.Number):
return u'{} = {}'.format(delimited_field, value)
elif isinstance(value, type(None)):
return u'{} IS NULL'.format(delimited_field)
else:
return u''' %s = '%s' ''' % ( delimited_field, value.replace("'", "'\'").replace('"', '\"') )

def select(datatype, *args):
"""
Data type non-specific Select tool handling

:param datatype: arcpy.Describe datatype keyword
:param args: arguments for Select/TableSelect tools
:return:
"""

feature_data = datatype in ['FeatureClass', 'FeatureLayer']
tool_name = 'Select' if feature_data else 'TableSelect'
eval('arcpy.analysis.{}'.format(tool_name))(*args)

def split_by_atts(in_data, out_workspace, fields):
"""
Split a feature class include a series of feature classes based on
unique values in a field.

:param in_data: The input data source
:param out_workspace: The output workspace that data will be written to
:param fields: Unique values in these fields will be used to split the data
:return: A list of output pathnames (output has been created)
"""

try:
from itertools import izip
except ImportError:
izip = zip

datatype = arcpy.Describe(in_data).datatype

unique_values = get_unique_values(in_data, fields)

workspace_type = arcpy.Describe(out_workspace).datatype

# If output workspace is a folder add a .shp extension
extension = ''
if workspace_type == 'Folder':
extension = '.shp'

arcpy.SetProgressor('STEP', '', 0, len(unique_values), 1)

outputs = list()
for i in unique_values:
output = create_name(out_workspace, i, extension)

expression = u' AND '.join([
create_expression(in_data, j[0], j[1])
for j
in izip(fields, i)])

select(datatype, in_data, output, expression)
values_string = u', '.join([unicode(v) for v in i])

arcpy.AddIDMessage('INFORMATIVE', 86245, values_string, output)

outputs.append(output)

arcpy.SetProgressorPosition()

return outputs

if __name__ == '__main__':
in_data = arcpy.GetParameterAsText(0)
out_workspace = arcpy.GetParameterAsText(1)
fields = [i.value for i in arcpy.GetParameter(2)]

try:
split_by_atts(in_data, out_workspace, fields)
arcpy.SetParameterAsText(3, out_workspace)
except Exception as err:
arcpy.AddError(str(err))
sys.exit(1)