Loop based on row values in pandas

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Python

My CSV file

ZIP_CODE   POPULATION
00601      700 
00606      500
11224      12000
23469      20000

I will create a Unique ID based on the population, like If Population <= 1000 then I have to create 10 Unique Id for Zip_code 00601 and 10 different Unique ID for zip_code 00606

What I have tried:

Below is what I have tried

pop_by_zip = r'population_census.csv'

df=pd.read_csv(pop_by_zip,delimiter="|")

Highly_low =df['Population'] <=1000

Here I want to Iterate over each rows having Population <=1000 and have to create 10 Unique Id for each Zip code. I am kind of stuck in looping here, help me out here

And I have to write an output file with below columns

Zip_Code  Population   UniqueId
00601     700          00000asdf98
00606     500          00000fgsshf98