Coding names with a uniqueid starting form 001 but not exceeding three digits

Question

I'm trying to code the names from geo database the total records of names are 957 and i want each name to have the uniqueID and it should not exceed three digits. starting from 001.

The below script started from 101 which now is giving me a problem when i rich to one thousand because it gives me the four digits.

I have been using the below Script to code names but unfortunately i'm now stuck because some ID'S are now having four digits.

rec=0 
def autoIncrement(): 
 global rec 
 pStart =101  
 pInterval = 1 
 if (rec == 0):  
  rec = pStart  
 else:  
  rec += pInterval  
 return rec

Here is the steps to code,

Right-Click on Field Calculator Set the Parser to Python (Default is usually VB) Tick Show Codeblock.

Paste the following into the Pre-Logic Script Code

rec=0 
def autoIncrement(): 
 global rec 
 pStart =101  
 pInterval = 1 
 if (rec == 0):  
  rec = pStart  
 else:  
  rec += pInterval  
 return rec

Paste the following code in the smaller box below the Pre-Logic Script Code:

autoIncrement()

Click OK.

Answer 1

You need to use the zfill string method. To start at 001 and end at 957, you need to use a text field and do the following in the code block:

rec=0 
def autoIncrement(): 
 global rec 
 pStart = 1  
 pInterval = 1 
 if (rec == 0):  
  rec = pStart  
 else:  
  rec += pInterval  
 return str(rec).zfill(3)

And the expression stays the same:

autoIncrement()