货币格式的Python字符串

Question

I am attempting to retrieve a dollar amount from my database, concatenate it with other information and have it print with 2 decimal points. I have tried so many different configurations I have lost tract but continue to get only one decimal point (or an error). Can someone please show me where I am losing it.

 #get payments on the permits
 for i in range(len(IDS)):  
     paydate = date.today() - timedelta(30)
     query = '''select `AmountPaid_credit`, `PayComment`, `DateReceived`, `WPTSinvoiceNo`
                 from Payments 
                 where `NPDES_ID` = ? and `DateReceived` >= ?'''
     PayStrings.append("\tNo Payment Recieved")
     for row in cur.execute(query, (IDS[i],paydate)):
         WPTSInv.append(row[3])
         d= row[2].strftime('%m/%d/%Y')
         #create a payment string 
         PayStrings[i]="\t$"+str(row[0])+" - "+d+" - "+row[1]

returns this

$2000.0 - 02/09/2017 - 2017 APPLICATION FEE

but I need this

$2000.00 - 02/09/2017 - 2017 APPLICATION FEE

Answer 1

As an alternative to Haifeng's answer, you could do the following

from decimal import Decimal

str(round(Decimal(row[0]), 2))

Edit: I would also like to add that there is a locale module and that it is probably a better solution, even if it is a little bit more work. You can see how to use it at this question here: Currency formatting in Python

Answer 2

In your case, you just converting decimal places:

   >>> value = "2000.0"
   >>> "{:.2f}".format(float(value))
   '2000.00'