Those commands are also available in the Python console after importing the library of processing algorithms: import processing QGIS itself has a great toolbox where you can access all the commands for raster and feature based analysis from a central hub. Layer = pythonaddins.GetSelectedTOCLayerOrDataFrame()īut it seems like the integration of Python into ArcGIS is orientated more towards ArcGIS whereas QGIS tends to utilize Python for QGIS workflows and therefore tries to make QGIS available for Python… Using Python in GISĪs we have now enabled Python in ArcGIS or QGIS let’s create some buffers around some features. If you want to make it unspecific of the name of the current layer using the pythodaddin module: Of course we can get some information about our layers. Also the ArcGIS Pzthon console show syntax suggestion and a help section to explain the syntax for a given arcpy command/class/function: arcpy syntax suggestion for the describe function arcpy help section Unfortunateley ArcGIS 10.3 does not provide a script editor like QGIS so you need to copy paste your syntax to another application, text editor or Python IDE. You open the Python console in ArcGIS/ArcMAP via the main dialog Geoprocessing–>Python: Opening the Python console in ArcGIS In ArcGIS we have a similar situation as most of the functionality is part of arcpy. The first real class used for Python in QGIS was called iface which is part of qgis.utils. Of course the canvas has much more then just layers but let’s stick to current active one by using another command to interfere with your data in the project: layer= iface.activelayer()Īs you might expect all the layers are now stored in your variable allLayers. Now you have all your objects from your working canvas available in the variable called canvas.
If you’re using the script editor you can store the script and run everything or you just select this line and use the right mouse button to select just to run this one line as it is selected. Let’s make a simple first statement by writing canvas = iface.mapCanvas()Īfter writing this in the input line you will have it already executed by hitting the Enter button. As QGIS provides an enhanced integration of Python the script editor will help you with a code-completion functionality like ArcGIS which will enables you to easily find possible functions and methods for your current “object”. The Python console itself has an input line in the main lower part and an output window in the upper main part. This should be a script you can write and were you can execute commands from: QGIS: Python console with the script function tool marked in red. The console shouldn’t be the preferred way to work with Python. The Python interface is not very “hidden” in both GI systems.įor QGIS simply go to Plugins –> Python Console and you will see a nice console in your QGIS working window. Jump to the QGIS or ArcGIS python syntax for buffer. Nevertheless I recommend to take some coding lessons in Python using CodeAcademy. So let us check out Python in ArcGIS and QGIS with a buffer analysis as an easy example. Despite any prejudices regarding programming, Python can be a big help in your basic tasks and is a very easy scripting language to learn. Often the usage of GIS never touches the world of programming and I think a lot of GIS users today feel fine with using simple tools and try to avoid tools like Python for their daily work.
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