Multi tool use

how to use the binary mode for csv file in python 3.6?

I have the following code :

file_name="data.csv"
temp_file=NamedTemporaryFile(delete=False)

with open(file_name,"rb") as csvfile, temp_file: #b stands for binary
reader=csv.DictReader(csvfile)
fieldnames=['id','name', 'email', 'amount', 'sent']
writer=csv.DictWriter(temp_file, fieldnames=fieldnames)
#writer.writeheader()
print(temp_file.name)
for row in reader:
print(row)
writer.writerow({
"id":row["id"],
"name":row["name"],
"email":row["email"],
"amount":"1293.33",
"sent":""
})


and the following error:
_csv.Error: iterator should return strings, not bytes (did you open the file in text mode?)

what should be done?

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