Update field based on values in other fields using search and update cursors

Question

I'm a Python beginner, I'm doing a risk analysis with a point feature, and I'm trying to write a script that allow me to update a field (proximity) based on different numeric values within different fields.

Each field (field_1, field_2, field_3, field_4) has just one possible value ( respectively 1, 2, 3, 4) and in each row there is recorded only one of these different values. Example: If in a row there's 1 in field_1 it's impossible to find other values in the other fields.

I would like to put everything in one field (proximity) to indicate the risk level.

I tried to run the following script to test only with field_1, but it's not updating, it's just printing "Nothing for each row".

with arcpy.da.UpdateCursor("point", "proximity") as cursor: 
for row in cursor: 
    with arcpy.da.SearchCursor("point", "field_1") as scursor:
        for row in scursor: 
            if row[0] == 1:
                cursor.updateRow(row)
        else: 
            print ("Nothing")

Answer 1

Try something like:

import arcpy
fc = 'points1'
fields = ['Field1','Field2','Field3','Result']
with arcpy.da.UpdateCursor(fc,fields) as cursor:
    for row in cursor:
        row[-1] = max(row[:-1])
        cursor.updateRow(row)

You might need to change max(row[:-1]). For example if you can have None values in some field, it will fail. Then try max([v for v in row[:-1] if v is not None])