How to merge all the rows of a col in csv using Python

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Python

CSV

hello everyone
I am trying to merge all the rows of a particular col of a csv but dont know how to approach it...

for root,dirs,files in os.walk(path):
for directory in dirs:
   for root,dirs,files in os.walk(path+"/"+directory+"/rdc_engineer"):
       for file in files:
           if file=="enginner.csv":
              df=pd.read_csv(path+directory+"/rdc_engineer"+"/"+file)
              for elements in prediction:
                 df["Engineer Behaviour"]=pd.Series(elements)
                 df.to_csv(path+directory+"/rdc_engineer"+"/"+file,index=False)

What I have tried:

it just writes the element in the first row of a new col which i want to merge cells of so i want that all the cells in the row "engineer behaviour" should get merged with the element written in it.