W W wrote:
One thing that's probably not in the scope of the program but really
usually a good idea is error checking.
i.e. this line:
rate = float(raw_input("Enter rate i.e. (0.5) : "))
could be converted to something like:
try:
rate = float(raw_input("Enter rate..."))
except ValueError:
print "Invalid input"
#Quit or loop until valid input is entered.
HTH,
Wayne
OK, this is what I came up with, how else could I do it so as not to use
sys.exit() ?
#!/usr/bin/python
"""Determine the number of bags to use to fertilize
a given area given the application rate."""
from sys import exit
class FertRate:
def __init__(self, rate, nitrogen, acre, bag):
self.area = 43.560
self.app = rate / (nitrogen / 100.00)
self.acre = acre
self.bag = bag
def result(self):
result = self.app * self.area * self.acre / self.bag
return result
def main():
while True:
try:
frate = FertRate( *get_inputs() )
result = frate.result()
print 'You should apply %0.2f bags.' % result
exit()
except TypeError, UnboundLocalError:
pass
def get_inputs():
try:
print 'Rate: Pounds nitrogen per 1000 (square feet)'
rate = float(raw_input('Enter Rate i.e., (0.5): '))
print "Nitrogen: The first number of the fertilizer's analysis"
nitrogen = float(raw_input('Enter Nitrogen From Bag i.e., (14): '))
acre = int(raw_input("Enter Total Acre's To Be Treated i.e,
(3): "))
bag = int(raw_input('Enter Bag Weight (lb): i.e., (50) '))
return rate, nitrogen, acre, bag
except ValueError:
print 'Invalid input!'
print 'You must enter a number!'
if __name__ == "__main__":
main()
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