Issue with reading CSV file

[nnsatpute]

Hello,

I am creating CSV file in unix with help of sed command.
File is getting created correctly as below:

Output:
Column_1 Nunber(10,1)
Column_1 Decimal(8,2)
Column_1 Varchar

I am trying to read this file row by row in python as below

with open (datafile) as csvfile:
        reader = csv.reader(csvfile,dialect='excel')
        row = next(reader)
            for row in reader:
            sql = sql + (" ".join(row)) +  (",") + "\n"
        
sql= sql[:-2]

when i am trying to put this row in sql file the comma in datatype is missing like below

Output:
Column_1 Nunber(10 1)
Column_1 Decimal(8 2)

Is there any reason for this ?