Why do I need an if else statement in ArcPy?

Why do I need an if else statement in ArcPy?

We ran into a problem where if there is no fire hydrant in the view than the script breaks. I want to put in an “if” “else” statement to tell it to skip the step that has the error if the select by location finds 0 hydrants. I have listed the script below.

How to use arcpy.getcount _ management ( ) in Python?

The following are 11 code examples for showing how to use arcpy.GetCount_management () . These examples are extracted from open source projects. You can vote up the ones you like or vote down the ones you don’t like, and go to the original project or source file by following the links above each example.

How does get count work in ArcGIS Pro?

Returns the total number of rows for a table. If the input is a layer or table view containing a selected set of records, only the selected records will be counted. This tool honors the Extent environment. Only those features that are within or intersect the Extent environment setting will be counted.

How to check number of rows in table in ArcPy?

You may also want to check out all available functions/classes of the module arcpy , or try the search function . def nrow(x): “””Return number of rows in a table as integer.

Why does ArcPy break if there is no fire hydrant?

I was messing around with ArcPY today at work and was having a problem. The script is designed to make a table of the fire hydrant valves that show up in a given data driven page view. We ran into a problem where if there is no fire hydrant in the view than the script breaks.

How to calculate slope of line in ArcPy?

If there are negative values in the slope field, I would like to multiple them by -1 and if not, multiple them by +1 (or do nothing). My input is a line shapefile. First I added a field called “slope”, then I calculate the slope based on other fields.

How to use IF THEN ELSE tool in ArcGIS?

If the Boolean output is True, select type A features using the Select Layer By Attribute tool, and modify the Description field values using the Calculate Field tool. The following example uses the If Selection Exists tool to check whether the input feature class has any selected features.

When to use Con or else in ArcGIS Pro?

The Test, Con, Greater Than, and Raster Calculator tools can be used to perform a Boolean evaluation of raster. In the following example, if a cell value is greater than 2000, then set to 1 (True), else set to 0 (False). The Con or Raster Calculator tool can be used to conditionally evaluate a raster.

How to use IF THEN ELSE in Python?

If-then-else logic can be explained as follows: if the condition is true, then perform an action, else perform a different action. In ModelBuilder, if-then-else logic can be added using the set of built-in logical tools or with custom Python functions or script tools.

How to make the exists and else statement in ArcGIS?

This code will go to WATERLINES.gdb, go through the gdb to see if the fc exist (based on a wildcard query), then add the fc to the mxd as desired. My questions is if the fc doesn’t exist, the “else” isn’t met.

How does the exists function in Excel work?

Determines the existence of the specified data object. This function tests for the existence of various data types including feature classes, tables, datasets, shapefiles, workspaces, layers, and files. The function returns a Boolean indicating whether the element exists.

Which is the best example of arcpy.describe?

The following are 30 code examples for showing how to use arcpy.Describe () . These examples are extracted from open source projects. You can vote up the ones you like or vote down the ones you don’t like, and go to the original project or source file by following the links above each example.

How to use IF THEN ELSE in ArcGIS?

The following code sample shows how if-then-else branching is implemented in the Check Coordinate System script tool referenced above. The script outputs two variables, one representing the if (true) condition and the other representing the else (false) condition.

How is the select function used in ArcGIS?

An SQL expression used to select a subset of features. For more information on SQL syntax see the help topic SQL reference for query expressions used in ArcGIS. The following Python Window script demonstrates how to use the Select function in immediate mode.

How is an SQL expression used in ArcGIS?

The input feature class or layer from which features are selected. The output feature class to be created. If no expression is used, it contains all input features. An SQL expression used to select a subset of features. For more information on SQL syntax see the help topic SQL reference for query expressions used in ArcGIS.