Creating Custom Solutions with FME and Python

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Creating Custom Solutions
with FME and Python

Meet the Presenters
Laura Wu Debbi Leung Kailin Opaleychuk

Agenda
What we’re covering today.
● Python Overview
● Integrating Python and FME
● Understanding Compatibility
● Intro to ...

Python Overview

What is Python?
Python is a scripting language.
Why is Python attractive?
● Free
● Well documented
● Compatible with many ...

Sample Python Script
import os
os. startfile(r"C:Program FilesFME2018fmeworkbench.exe")
import os
os. startfile("C:Program...

Integrating Python and FME

Reasons for using
Python in FME:
● To perform transformations or other
operations FME workbench doesn’t
support
● Leverage...

Reasons for using
Python in FME:
● To perform transformations or other
operations FME workbench doesn’t
support
● Leverage...

There are numerous FME transformers for
performing almost every task you can think
of without resorting to scripting.
If y...

Where can I ﬁnd
Python in FME
Workbench?
● Startup Python scripts
● Shutdown Python scripts
● Scripted parameters
● Python...

Startup Python Scripts in FME
These parameters allow a
user to specify a Python
script that is executed prior
to a transla...

DEMO

Shutdown Python Scripts in FME
Enables a user to specify a
Python script that is executed
after a translation.
● Send a no...

DEMO

Scripted Parameters
Set User Parameter values
dynamically based on output
from a Python script.
These run before any Start...

DEMO

PythonCreator
Can be used to start oﬀ a workflow within FME.
Creates any number of features to be used
within downstream t...

DEMO

PythonCaller
Used mid-stream within an FME workflow
Run a python script once per input feature
OR
Run a python script on g...

DEMO

Understanding Python
Compatibility

Supported Python Versions
FME 2021 supports Python 3.6-3.8 and provisionally supports
Python 2.7 depending on the operatin...

Preferred Python Interpreter
This per-user setting controls:
● Default Python Compatibility value for new
workspaces
● Int...

Python Compatibility
This parameter specifies the level of compatibility your
workspace or custom transformer has with diﬀ...

Choosing a Python
Interpreter
● Recommendation: use Python 3
○ Python 2.7 is end-of-life
○ FME 2023 will drop Python
2.7 s...

Python on FME Server
Engines uses a workspace’s Python
Compatibility parameter to determine
which Python interpreter shoul...

Python in diﬀerent Operating Systems
Windows
Uses bundled
interpreter by
default
Can use custom
Python interpreter
Linux
U...

Using ArcPy with FME

Introduction to ArcPy
ArcPy is a package that provides geographic data analysis, data conversion, data
management, and map...

DEMO

Importing Modules

Python Modules in FME
You can use anything from the Python Standard Library with no extra work
Simply import os, fileinput...

Install Python Packages
Use pip - package installer for Python
fme.exe python -m pip install <
package_name> --target <pac...

DEMO

Resources
● Tutorial: Python and FME Basics
● Python Scripted Parameters in FME
● Installing Python Packages to FME
Deskto...

Thank you!
Please type in your questions to the Q&A panel
or ask them anytime at safe.com/community
Connect with us for mo...

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