Questions tagged [python-parser]

For questions about ArcGIS Python Parser for labelling expressions and field calculations

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Calculating New Field using Python Field Calculator From Two Fields Returning Specific Numbers

I have never used the SQL function in the field calculator and need some guidance. I am attempting to calculate new field data (date update) using python for a client that will look at first at one ...
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1answer
42 views

Calculating values in field to round up to 1 if value is greater than 0 using ArcGIS Field Calculator?

I am prepping vector data for raster conversion and analysis. In order to prep the data I need to have a field that represents data/no data (1/0). I built a model that outputs the necessary features ...
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1answer
45 views

What does if-else code do?

I just started a new job and in one of the procedures I was given for one of my tasks I found this piece of code. It just adds a comment to a field that's already filled up. For instance, field1 might ...
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2answers
51 views

Filling attribute tables with values from the same attribute table

Just wondering if there's an easy way to fill null values in one column in an attribute table with values in another column of the same attribute table by just writing a query "just the "null values" ...
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2answers
42 views

Finding and replacing with if then else statement in field calculator of ArcGIS Pro?

I have a column of strings that always start with the first two characters being numbers, like 39 or 07, etc. In a new column I want to process the original column so that I replace any of those ...
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34 views

Adding minimum point Z of polygon using ArcGIS Field Calculator?

In the middle of a ModelBuilder tool I created, I have a Z enabled feature with multiple polygons. I want to add on a specific field of this feature, the lowest Z value of each polygon. I know this ...
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2answers
32 views

Adding time to variable using Python Parser of ArcGIS Calculate Value tool?

I am using Python 2.7 in calculate value in ModelBuilder. I want to query both 30 seconds before and after the variable. The original value keeps returning not the time change. What am I not defining? ...
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2answers
29 views

Creating conditional stacked labeling in ArcGIS Pro?

I found a code example for what I'm looking to accomplish at Creating conditional stacked labeling in ArcGIS Pro? I want to display filter quantity and sizes for a school district per building in a ...
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0answers
23 views

Reclassifying string variable in ArcGIS Field Calculator with Python Parser?

I am trying to calculate a roadway pedestrian restriction based on its functional class, using if/else logic in Python. Every time I enter this, it only turns up 'No'. The categories are strings, and ...
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1answer
37 views

Keeping only 7 digit number within field name using ArcGIS Pro field calculator and regex

I have a field titled GEOGRAPHY, which contains hundreds of records containing various strings of all similar format, for example: "Witless Bay (1001559) T 00000 ( 6.5%)" "Laniel (2485905) NO ...
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1answer
26 views

Pulling date from filename and in proper format for time enabled use?

My feature attribute table has a folderpath that indludes a date time. Example:/documents/foldername/xyz2015OCT15063333.shp It seems very simple, but I am not a programmer and have done my best to ...
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2answers
43 views

Calculate time duration from military time with ArcMap Field Calculator [closed]

I have two text fields (STRTTIME, ENDTIME) which are are formatted as military time with leading zeros. For example, 0540, 1655. I want to calculate a new field with the time duration as integers (...
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1answer
50 views

Using If statements to conditionally populate a field in Field Calculator

I'm trying to use the field calculator to poplulate a string field in a table based on info in another string field. This is what I have: def Reclass(Correction_Comments): if (MSAGSTREETNAME) = '...
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0answers
45 views

Converting Python to Arcade in ArcGIS Online?

The following python expression can trim street addresses for labeling in ArcMap. I need to convert the expression to Arcade so I can retain the same labeling scheme when pushing my feature layer ...
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2answers
165 views

Using Python Parser in ArcGIS Pro Field Calculator?

I am having a problem in migrating from Vbscript to Python for ArcGIS Pro. Building 5, Street 6 What is wrong in this expression? "{}:{}:{}:{}:{}:{}".format("Building ",!Building_Number!," , ",!...
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1answer
31 views

Simplifying a long if condition statement and adding status report?

def Assign(csdname, cdname, ccsname, zone): if csdname == "Oshawa" or csdname == "Whitby": return "70" elif csdname == "Toronto": return "71a" elif csdname == "Mississauga" or csdname == "...
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0answers
44 views

If Then Statement, Python Label expression, ArcGIS Pro

I'm trying to create a Python label expression in ArcGIS Pro for a parcel layer where I only want to label the parcel when a street number in the Address field is present.If a street number is not ...
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0answers
35 views

Field calculator returning ERROR 000989? [closed]

I'm trying to split a field of street addresses (field name "PROP_STREE") so that it returns only the house number (so "123 Main St" would become "123"). Following the solution provided Field ...
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0answers
43 views

Changing date format for labels in ArcGis Pro with label expression?

I am trying to use an expression to convert my date field to a simple %d,%b,%Y format. Right now it is in "%Y%m%d %H:%M:%S %z" How do I do it properly using Python to do this in ArcGIS Pro? Q&...
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1answer
32 views

Auto incrementing every second row in ArcGIS Desktop?

How do I auto increment every second row (field type is short and I work with 150 fields) in ArcGIS Desktop 10.3.1? I saw this code in https://support.esri.com/en/technical-article/000011137 rec=0 ...
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2answers
41 views

Reclassifying vector polygons based on text string to integer using Python Parser of ArcGIS Field Calculator?

So I am trying to reclassify a text string by searching for bits of strings and converting those strings to an integer value in a new field within the field calculator. e.g. I want to find all values ...
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0answers
40 views

Calculating field after arcpy.Append_management()?

I have some AutoCAD layers (f.e. Cad1, Cad2) and I want to export them into feature class in a geodatabase (f.e. feature_class). Also I want to calculate field in "feature_class" for objects from CAD. ...
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1answer
56 views

Capitalizing and changing font/color in Label Expression using Python Parser of ArcGIS Pro?

Currently Using ArcGIS Pro 2.3.2 and Python. I am currently trying to label Road names, which are all uppercase in the database. I'm unable to edit the database but would like to Capitalize the road ...
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1answer
37 views

Auto Incrementing Field based on Selection of Records in Feature Class?

I'm attempting to write a script that will add an incremented value to a field based on a selection of records. For example, the script will select the first 300 records in a feature class and then ...
1
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1answer
35 views

Calculating field from three conditional statements

I am working on a road dataset and would like to calculate a field(speed) using three conditional statements from two fields: formOfWay: with value, Dual carriageway etc. routeHierarchy: with values ...
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1answer
89 views

Update Cursor skipping last row?

I have created a python function within field calculator to calculate the time difference between a timestamp (yyyy-MM-dd HH:mm:ss) in a row and the row after (the interval field in seconds). I have ...
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4answers
103 views

Copying/replacing first letter in column of attribute table in ArcMap with field calculator and Python Parser? [closed]

How to copy / replace the first letter in a column if that letter is "N" and replace with "C" in the field name "DISTRICT" inside the attribute table in ArcMap using Python inside the field calculator?...
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1answer
52 views

Python Script is repeating results

I have developed a python script to copy and paste in the field calculator. Having an input of three values, it compares all of them and returns a list of unique values. The problem is that when I use ...
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0answers
18 views

Sum calculation in Field Calculator using Python script [duplicate]

I have a problem with Python script in Field Calculator. How to sum the values of one field ('AB') and paste the sum in another field ('RE') using Python in Field Calculator? I'm working in ArcMap 10....
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2answers
50 views

Use a python expression in Field Calculator to sum each row across several columns

this seems like it should be easy but I am new to python and am having trouble... I have four columns. I would like perform a field calculation that sums the values by row for three of the columns and ...
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1answer
48 views

Getting angle of point generated from DEM in Raster using Field Calculator in ArcGIS Desktop?

I am trying to calculate the angle of some specific points generated from flow direction in ArcMap 10.2. I converted the DEM to flow direction and then to points. I am trying to convert the grid_code ...
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1answer
50 views

Reclassifying field using Python wildcard string search?

I have a point layer with 900K Tree Point records. In that layer I have field (d_Species) that contains the tree species of each record. I've created a field (SpecieValu) to assign a value (0-3) for ...
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2answers
38 views

Splitting string ID code into various parts

I have a series of identification codes that I need to split out. The format of these codes is [region(letter)][district(number)] - [place(number)][subdistrict(letter)]. An example of some codes ...
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1answer
205 views

“No module named numpy” Python Error in ArcGIS Label Expression?

I have developed code to label points that pull formatting from a dictionary. I developed this code and it was working fine two weeks ago, today I try to open my map and I am now met with an error ...
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1answer
45 views

Autoincrementing one character in calculate field of ArcGIS Pro?

I am using ArcGIS Pro. I have this set of points where I like an unique id (uid). The only thing they need to be unique is a counter of some sort at the end. I have another field with some id that ...
2
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1answer
20 views

Modify script so only empty fields are changed in ArcGIS Pro?

I currently use a script that converts the integer in OBJECTID to a string and combines it with another string (in this case UAW,) to populate a field Field = str(!OBJECTID!) + "UAW" Now that I have ...
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0answers
250 views

Converting Text Field to Numeric in ArcGIS Pro?

I'm trying to convert text to numeric, but am unable to in ArcGIS Pro. Is there a Python function? I tried int(!FieldName!) but I think NULL values are messing it up?
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1answer
36 views

Using Python Lists in Calculate Field Code Block? [closed]

I'm looking for some help in explaining what exactly is occurring with the following code: MaterialLife = "LifeMaterial(!"+Material+"!)" codeblock2 = """def LifeMaterial(mat): material = {"ABS":...
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0answers
36 views

Calculating Raster Percentile Values in ModelBuilder

I want to calculate the 75th percentile value of a raster dataset (floating, 32Bit) and use this value as an input to a set null expression. I have multiple rasters to perform this on so I need to ...
2
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1answer
23 views

Splitting ID number along hyphens and creating new field with only parts of ID In Field Calculator?

I have a shapefile with polygons and each polygon has an ID number that follows a pattern like this: SMP_ID 1077-1-1 8-2-2 1281-1-3 304-2-1 In have created a new field and I need to populate it ...
3
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2answers
42 views

Python Expression for Labeling Addresses

I am trying to create a python label expression where only the first word of the address is labeled. Additionally I only want a label to appear if it is a number not a word. I have used this script ...
2
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2answers
158 views

Using Python in field calculator to extract highest value from 3 columns [closed]

I have three columns, one for percentage White, percentage Hispanic, and percentage African American per census tract. I'm trying to use Python to extract the population subtype with the highest ...
2
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2answers
58 views

Calculate field does not update using ArcPy

I want assign 33 if the field no_apt is zero and 34 if no_apt is any else value. The model run without any error, but no value are assigned the field GGV_kW. What is wrong with the code since it doesn'...
3
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2answers
193 views

Extracting substring from field in ArcMap using Python Parser of Field Calculator?

I have some parcel data where I need to extract a subdivision name from a long string. The format is always "Subdivision: ____ ______ _____" etc. BUT, there is no uniformity to what comes before or ...
3
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0answers
42 views

Time series condition through field calculator [closed]

I am attempting to filter some time stamped data which I have enabled through the Convert Time Field tool, depending on a true/false condition. I am doing this through the field calculator within ...
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3answers
66 views

Converting VB codeblock to Python in ArcGIS Field Calculator?

I have created a tool in Model Builder to plot telecoms data - the user clicks a point on the map, enters a radius and enters an azimuth. The model then creates the buffer and cuts a segment out of ...
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0answers
49 views

Using IF-Statements in Calculate Field Code Block inside an Iteration

I have created a model in ArcGIS 10.2 that iterates through some feature classes in order to add a field 'Zmin10' (double) and calculate the field value based on a variable (called "Minimum") to which ...
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1answer
50 views

VBA/Python If/then statements in Field Calculator for one column based on another not working

I know this question has been asked a hundred times on here, for example: Basic If/Then in Python Parser of ArcGIS Field Calculator? Using if/elif/else statements in ArcGIS Field Calculator? Checking ...
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0answers
43 views

Calculating sequential numbers into sorted table not dependent on OBJECTID? [duplicate]

I am having a problem with adding sequential numbers to the new column based on other sorted value. I would like to use 'Sort by' column to be able to generate numbers in the 'Required number'column. ...
0
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1answer
142 views

Extracting numbers from string field but omit some unnecessary cells using Python Parser of ArcMap Field Calculator?

I refer to Extracting numbers from string field using Python Parser of ArcMap Field Calculator? The script above works fine for me, but I have to develop it a little. What I want is just to omit ...