Concatenate increment numbers and a text field using Python in ArcGIS Pro

Summary

In ArcGIS Pro, the Calculate Field tool can be used to perform calculations on all or selected records using Python expressions. This article provides the workflow to concatenate increment numbers and an existing text field using Python.

Procedure

1. In ArcGIS Pro, in the Contents pane, right-click the feature layer, and select Attribute Table.
2. In the table view pane, right-click the existing text field header, and select Calculate Field. In this example, the text field is Text1.

3. In the Calculate Field window, type a new name in Field Name to populate the calculation output to a new field. In this example, the name of the new field is Text_AutoIncrement.

Note:
This step can be skipped to populate the calculation output to the existing text field.

4. In the expression box, type the following code. Replace 'Field Name' with the name of the existing text field.

str(!Field Name!)+" "+str(autoIncrement())

Note:
Do not remove the exclamation marks surrounding the field name. Remove the double quotation marks (" ") to eliminate the space if required. 

5. Copy and paste the following into the Code Block box.

rec=0
def autoIncrement():
    global rec
    pStart = 1  # adjust start value, if req'd 
    pInterval = 1  # adjust interval value, if req'd
    if (rec == 0): 
        rec = pStart 
    else: 
        rec = rec + pInterval 
    return rec

6. Click Apply.
7. Click OK to close the Calculate Field window. The new field, Text_AutoIncrement is populated with values from the existing text field and the increment numbers.