Using multiple workspace environments ArcGIS Python

Question

How do I combine all three workspaces?

Only 1 workspace is being read while exporting data.

import os
import arcpy
# Set environment settings
arcpy.env.workspace = "C:/eis/eis shape/UPDM.gdb/P_PipeSystem"
arcpy.env.workspace = "C:/eis/eis shape/UPDM.gdb/OtherCompanies"
arcpy.env.workspace = "C:/eis/eis shape/UPDM.gdb/NEO"
arcpy.env.overwriteOutput = True
# Set local variables
outWorkspace = "C:/data"
try:
 # Use ListFeatureClasses to generate a list of inputs
 for infc in arcpy.ListFeatureClasses():
 # Determine if the input has a defined coordinate system, can't project it if it does not
 dsc = arcpy.Describe(infc)
 if dsc.spatialReference.Name == "Unknown":
 print ('skipped this fc due to undefined coordinate system: ' + infc)
 else:
 # Determine the new output feature class path and name
 outfc = os.path.join(outWorkspace, infc)
 # Set output coordinate system
 outCS = arcpy.SpatialReference('WGS 1984')
 # run project tool
 arcpy.Project_management(infc, outfc, outCS)
 # check messages
 print(arcpy.GetMessages())
except arcpy.ExecuteError:
print(arcpy.GetMessages(2))
except Exception as ex:
print(ex.args[0])

• Hornbydd: You cannot,arcpy can only have one current workspace, turn your code into function that takes a workspace then call it three times, one for each input workspace.
• jpmc26: @Hornbydd When designing software, it's generally a bad idea to have a function modify global state.

Answer 1

You can have only one 'current' or 'active' workspace. The ListFeatureClasses() function is similar to 'dir' command in windows command line - you can list only one 'current' dir at time and if you need more, you need to switch.

Use for cycle to iterate over workspaces:

import os
import arcpy
# Set environment settings
workspaces = [
 "C:/eis/eis shape/UPDM.gdb/P_PipeSystem",
 "C:/eis/eis shape/UPDM.gdb/OtherCompanies",
 "C:/eis/eis shape/UPDM.gdb/NEO"
]
arcpy.env.overwriteOutput = True
# Set local variables
outWorkspace = "C:/data"
try:
 for ws in workspaces:
 arcpy.env.workspace = ws
 # Use ListFeatureClasses to generate a list of inputs
 for infc in arcpy.ListFeatureClasses():
 # Determine if the input has a defined coordinate system, can't project it if it does not
 dsc = arcpy.Describe(infc)
 if dsc.spatialReference.Name == "Unknown":
 print ('skipped this fc due to undefined coordinate system: ' + infc)
 else:
 # Determine the new output feature class path and name
 outfc = os.path.join(outWorkspace, infc)
 # Set output coordinate system
 outCS = arcpy.SpatialReference('WGS 1984')
 # run project tool
 arcpy.Project_management(infc, outfc, outCS)
 # check messages
 print(arcpy.GetMessages())
except arcpy.ExecuteError:
print(arcpy.GetMessages(2))
except Exception as ex:
print(ex.args[0])