Python Beyond the Basics …. Ghislain Prince Jeff Bigos.

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Presentation transcript:

Python Beyond the Basics …. Ghislain Prince Jeff Bigos

Comprehensions Cursors Modules Geometry

Comprehensions

List Comprehensions - Loop and filter items from an existing list - List is returned

Comprehensions List Comprehensions - Loop and filter items from an existing list - List is returned

Comprehensions List Comprehensions - Loop and filter items from an existing list - List is returned

Comprehensions List Comprehensions - Loop and filter items from an existing list - List is returned

Comprehensions Dictionary Comprehensions - Loop and filter items from an existing Dictionary - Dictionary is returned

Comprehensions Dictionary Comprehensions - Loop and filter items from an existing Dictionary - Dictionary is returned

Comprehensions Dictionary Comprehensions - Loop and filter items from an existing Dictionary - Dictionary is returned

Cursors

Two varieties - Arcpy.da cursors (10.1 onwards) - ‘Classic’ cursors TypeFunction SearchCursorRead-only UpdateCursorUpdate or delete rows InsertCursorInsert rows

Understanding Data access Cursors Fields parameter - Index position in fields parameter defines value access - Provide needed fields

Understanding Data access Cursors Fields parameter - Index position in fields parameter defines value access - Provide needed fields

Understanding Data access Cursors Where Clause - Filters the records returned Spatial Reference - Project data on the fly

Geometry

Creating Geometry

List of coordinates - *coords Creating Geometry

Relational: - Is a point within a polygon - Return Boolean Values Geometry Operators

Contains: Geometry Operators Crosses: Touches: Additional Methods in the documentation

Modules

Modules: Included with python - urllib: functions and classes for using internet resources - Urlencodings, POST, GET - json: work with json data - Encoding, decoding - zipfile: create and extract from zipfiles - Resources: - Python help: Global Module Index - Python module of the week

Modules: Included with ArcGIS - numpy: n- dimensional array - Spatial Analyst, arcpy.da conversion functions - matplotlib: Graphing and Charting - Spatial Statistics visual outputs - xlrd / xlwt: read and write excel files - Used in the excel toolset - Resources: - Python help: Global Module Index - Python module of the week