CODEWITHSUNDEEP
pythonpython-2.7decimal
lookininward
lookininward

Reputation: 671

How can I get Python to work on int inputs, converting them to two decimal points?

This program is intended to do the following:

I would like the numbers to be accurately calculated to two decimal places. The issue is that if the user does not include decimals during input then the program doesn't recognize the decimal places.

This is why I've added the "broker_purchase_commission / 100.00" line, thinking it would force calculations to two decimal places. However, this does not appear to work. Any help is appreciated. 

shares_purchased = input("How many shares were bought? ")
share_initial_price = input("What was the price per share? $")
broker__purchase_commission = input("What percentage commission is due to the stockbroker? ")
broker__purchase_commission = broker__purchase_commission / 100.00
purchase_price = ((shares_purchased * share_initial_price) + ((shares_purchased * share_initial_price) * broker__purchase_commission))

print ""
print "You purchased stock worth $%d" %purchase_price
print "Two weeks later you decide to sell the stock."
print ""

shares_sold = input("How many shares are sold? ")
share_present_price = input("What is the price per share? $")
broker__sale_commission = input("What percentage commission is due to the stockbroker? ")
broker__sale_commission = broker__sale_commission / 100.00
sale_price = ((shares_sold * share_present_price) + ((shares_sold * share_present_price) * broker__purchase_commission))

print "You sold stock worth $%d" %sale_price

Upvotes: 1

Views: 66

Answers (3)

Iron Fist
Iron Fist

Reputation: 10951

Just use string formatting, mentioning the number of decimal to print:

>>> x = 1.0/10
>>> x
0.1
>>> print '%.2f' % x
0.10
>>> print '%.3f' % x
0.100

So in your code, you code apply it this way:

print "You sold stock worth ${:.2f}".format(sale_price)

Upvotes: 0

innoSPG
innoSPG

Reputation: 4656

For money stuff, you need precision, you must use the decimal module and convert all your numbers to Decimal like:

from decimal import *
Decimal(number)

So you should cast all the input to Decimal like

shares_purchased = Decimal(input("How many shares were bought? ")).

and also cast 100.00 to Decimal in your division by using Decimal(100.00). For printing, make sure you do not cast the result to integer.

print "You purchased stock worth ", purchase_price

instead of

print "You purchased stock worth $%d" %purchase_price

See https://docs.python.org/2/library/decimal.html for the doc of the module.

Upvotes: 2

Jay
Jay

Reputation: 1599

did you try to use float() constructor? like 

broker__sale_commission = float(broker__sale_commission)

Read more here

Upvotes: 0

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