topic Re: Learning Python in Python Questions

Learning Python

RobertBorchert — Thu, 29 Aug 2013 17:20:19 GMT

Can anyone direct me to a good resource for learning to script with Python? Especially as it relates to ArcGIS

I have experience in VB so the idea is not completely foreign to me

Re: Learning Python

JoeFlannery — Thu, 29 Aug 2013 17:22:33 GMT

This is good.
http://esripress.esri.com/display/index.cfm?fuseaction=display&websiteID=224&moduleID=0

Re: Learning Python

JimCousins — Thu, 29 Aug 2013 17:27:48 GMT

There is also a free ESRI web course "Using Python in ArcGIS 10"
http://training.esri.com/gateway/index.cfm?fa=catalog.webCourseDetail&CourseID=1868
Regards,
Jim

Re: Learning Python

DanPatterson_Retired — Thu, 29 Aug 2013 18:10:40 GMT

www.python.org as well as any book published by O'Reilly (check online) These don't relate to ArcGIS but will get you up to speed. Also don't forget the code samples in the help files http://resources.arcgis.com/en/help/main/10.2/index.html

Re: Learning Python

RobertBorchert — Thu, 29 Aug 2013 18:11:10 GMT

Thanks, these are both great suggestions. I am going to run the free course and see if my Supervisor will get the book ordered for me.

Re: Learning Python

RobertBorchert — Thu, 29 Aug 2013 18:13:14 GMT

I was just on the Python web site before replying.

I see I can download Python for free. It may come in handy for things outside of the ESRI environment. Is ESRI Python use compatible with the most recent release of Python.

www.python.org as well as any book published by O'Reilly (check online) These don't relate to ArcGIS but will get you up to speed. Also don't forget the code samples in the help files http://resources.arcgis.com/en/help/main/10.2/index.html

Re: Learning Python

MaryM — Thu, 29 Aug 2013 18:38:45 GMT

Google has a python course, very good.
https://developers.google.com/edu/python/

Re: Learning Python

MattSayler — Thu, 29 Aug 2013 19:01:08 GMT

I was just on the Python web site before replying.

I see I can download Python for free. It may come in handy for things outside of the ESRI environment. Is ESRI Python use compatible with the most recent release of Python.

It's not the most recent (python is up to 3.x, ArcGIS uses 2.6 or 2.7 depending on your version), but from the bits of gossip I've heard, 2.x will probably be around for a while. Other than installing to a non-standard location, and adding the arcpy site package, I don't think Esri makes any significant changes to the distribution.

You used to be able to install python before ArcGIS and then the ArcGIS installer could use the existing python install (still had to be correct version). I haven't run an install in a few versions, so I'm not sure if that's true anymore. I think arcpy requires specific versions of certain modules too, like numpy, so it may not be 100% cut and dry anymore.

But all and all Python has been pretty handy. It's kind of like the Swiss Army Knife of languages.

Re: Learning Python

RobertBorchert — Thu, 29 Aug 2013 19:07:02 GMT

I have ArcGIS 10.2 on my machine. I just looked in the Start menu and it shows Python 2.7 is installed.

It's not the most recent (python is up to 3.x, ArcGIS uses 2.6 or 2.7 depending on your version), but from the bits of gossip I've heard, 2.x will probably be around for a while. Other than installing to a non-standard location, and adding the arcpy site package, I don't think Esri makes any significant changes to the distribution.

You used to be able to install python before ArcGIS and then the ArcGIS installer could use the existing python install (still had to be correct version). I haven't run an install in a few versions, so I'm not sure if that's true anymore. I think arcpy requires specific versions of certain modules too, like numpy, so it may not be 100% cut and dry anymore.

But all and all Python has been pretty handy. It's kind of like the Swiss Army Knife of languages.

Re: Learning Python

StacyRendall1 — Thu, 29 Aug 2013 21:33:11 GMT

I have ArcGIS 10.2 on my machine. I just looked in the Start menu and it shows Python 2.7 is installed.

I would strongly recommend not installing another Python. You are better to just use the ArcGIS Python as your default system Python - there are no real disadvantages to doing this. It has the advantage that you don't have clashes, installer mixups, etc.

This is particularly true now that ESRI have released 64-bit Background Geoprocessing, which gives you a default 64-bit Python (unfortunately you can't then delete the 32-bit Python...). Prior to this I had to run a separate Python just for dealing with large datasets (outside of Arc), now I can use the one Python for everything.

For use with ArcGIS there are practically no advantages to using Python 3, so you aren't missing out on anything.

Although, if you really want to practice for when ArcGIS does move to Python 3 you can emulate a lot of the behaviour with with import __future__, i.e. (ones less likely to be useful commented out...):

from __future__ import division, print_function #, unicode_literals, with_statement

Re: Learning Python

NeilAyres — Fri, 30 Aug 2013 06:50:07 GMT

I have also found Mark Pilgrim's Dive into Python really useful for all the basics...
List manipulation, dictionaries and much else.

http://www.diveintopython.net/

Cheers,
N