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Getting Started with Python in

ArcGIS Pro

What is ArcPy?

ArcPyis a Python module that

interacts with the tools in arctoolboxwhich are part of

ArcGIS Pro and ArcGIS Desktop.

This module allows the user to

access the geoprocessing tools available in ArcGIS Pro and

Desktop.

Python in ArcGIS Pro

The Python window in ArcGIS Pro

Printing text

Using a variable

Print text with a variable

text = ('Welcome to python') print(text)

Open the attribute table to

see how many records are in the roads

Attributes

We get the same information by using the

Get Count tool from arctoolboxinto the

python window

Assign and Print a Variable

count = arcpy.management.GetCount('centreline') print(count)

ArcGIS Toolbox Help

When using tools help is available at the command line

By clicking the Question mark it brings you

to the online help of the tool

List feature classes in a Directory

arcpy.env.workspace= "C:/Bits_Bytes/" fclist= arcpy.ListFeatureClasses() print(fclist)

Python window code and output

Python directory for stand alone programs

Setup Python version in PyScripter

C:\Program Files\ArcGIS\Pro\bin\Python\envs\arcgispro-py3

Projection Test

import arcpy from arcpyimport env env.workspace= "C:/Bits_Bytes/" prjfile= "C:/Bits_Bytes/Python/Schools.prj" spatial_ref= arcpy.SpatialReference(prjfile)

print ("the projection is ", spatial_ref.name, " and will be used to check the projection of the shapefiles in this directory \n ")

fclass= arcpy.ListFeatureClasses() print ("These shapefiles do not have a UTM projection") for fc in fclass: spatial_ref= arcpy.Describe(fc).spatialReference if spatial_ref.name != "NAD_1983_UTM_Zone_17N": print (fc)

To be run in PyScripter

Project_management(in_dataset, out_dataset,

out_coor_system, {transform_method}, {in_coor_system}) in_datasetin_featthis is the input shapefile which will be projected out_datasetout_featthis is the output shapefile which will be the projected shapefile out_coord_systemout_coordis the projection that will be assigned to the new shapefile. This is defined by using the SpatialReferencefunction where the new projection will be Nad1983 UTM

Zone 17

Project Shapefiles

There are many way to define projections in

arcgis. The spatial reference can be defined by using the prjfile from a shapefile, from typing out the actual projection such as 'NAD 1983 number such as 26917.

Spatial Reference

Project Shapefile

In ArcGIS Pro type the code below in the python window. This will project the shapefile by assigning the SpatialReferencecommand a projection definition and then using project_managementto project the shapefile.

import arcpy from arcpyimport env env.overwriteOutput= True in_feat= "C:/Bits_Bytes/Wards.shp" out_feat= "C:/Bits_Bytes/PRJ/Wards.shp" out_coord= arcpy.SpatialReference('Nad1983 UTM Zone 17N') arcpy.Project_management(in_feat, out_feat,out_coord)

Project Shapefiles in a

Directory

import arcpy from arcpyimport env env.overwriteOutput= True env.workspace= "C:/Bits_Bytes/" prjfile= "C:/Bits_Bytes/Schools.prj" spatial_ref= arcpy.SpatialReference(prjfile) print ("the projection for schools.shpis ", spatial_ref.name) fclass= arcpy.ListFeatureClasses() for fc in fclass: spatial_ref= arcpy.Describe(fc).spatialReference print (spatial_ref.name, " is the projection for ", fc) if spatial_ref.name == "NAD_1983_UTM_Zone_17N": print (fc, "... will not be projected \n") else: print (fc, "...is being projected") out_dir= "C:/Bits_Bytes/PRJ/" out_coord= arcpy.SpatialReference('NAD 1983 UTM Zone 17N') in_feat= fc out_feat= out_dir+ fc

This will be run from pyScripter

Select data for clipping

Using the select tool

we can see this sql code

This will not work in

python!

Use Model Builder to get python Code

From select tool

NAME ='St. Paul''s;ϮϭͿ'

From Model builder

"NAME = 'St. Paul''s(21)'"

SQL Syntax from Model Builder

arcpy.analysis.Select(in_features=Wards, out_feature_class=clip_shp, where_clause="NAME = 'St. Paul''s(21)'")

Select_analysisextracts features from an

inputfeature classor inputfeature layer, typically using a select or Structured Query

Language (SQL) expression and stores them

in an output feature class Select_analysis(in_features, out_feature_class, {where_clause})

Inf_featuresWards.shp

Out_feature_classClip.shp

Where clause "NAME = 'St. Paul''s(21)'"

import arcpy from arcpyimport env env.overwriteOutput= True env.workspace= "C:/Bits_bytes/PRJ" arcpy.Select_analysis('Wards',"C:/Bits_bytes/PRJ/Clip.shp","NAME = 'St. Paul''s(22)'")

This will be done in ArcGIS Pro

Clip data

import arcpy from arcpyimport env env.overwriteOutput= True arcpy.env.workspace= "C:/Bits_bytes/PRJ/" outclip= arcpy.CreateFolder_management("C:/Bits_bytes/","CLIPPED") fclist= arcpy.ListFeatureClasses() for fc in fclist: in_feat= fc if in_feat!= "Wards.shp" and in_feat!= "Clip.shp": print ("C:/Bits_bytes/CLIPPED/" + fc, " will be clipped \n") out_feat= "C:/Bits_bytes/CLIPPED/" + fc print(out_feat) clipper = "C:/Bits_bytes/PRJ/Clip.shp" arcpy.Clip_analysis("C:/Bits_bytes/PRJ/" + fc,clipper,out_feat)

To be run in PyScripter

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