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bill calculator

 

bill calculator
chrishaizimsque

12 Oct, 2009 - 12:45 AM
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i dont know what i am doing wrong in this code can i get some help

# a4-3.py
# chris haizimsque
# ncit 106 fall 2009

kwh = input("enter kilowatt-hours used: ")
if kwh < 0:
print "/nreckeck input value!"
print "(it was negative, and meters/ndon`t run backward.)"
else:
if kwh <= 500.0:
amounr = 20.0
elif kwh <= 1000.0:
amounr = 20.0 + 0.03*(kwh-500)
else:
amount = 35.0 + 0.02*(kwh-1000)
print "bill amount = $%1.2f" % amount




this is the thingy i get back that i am doing wrong

Traceback (most recent call last):
File "C:/Python26/bill calculator.py", line 16, in <module>
print "bill amount = $%1.2f" % amount
NameError: name 'amount' is not defined

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5thWall

RE: Bill Calculator

12 Oct, 2009 - 10:35 PM
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You only define amount once, in the final else. You might want to check the spelling on amounr. wink2.gif
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dave_6_10

RE: Bill Calculator

24 Oct, 2009 - 11:37 AM
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It is actually theoretically possible for a meter to run backwards. In which case the electric company would actually send you a small check for manufacturing electric to their grid. This was done when a friend's dad set up a solar power generator in his home and for the first 2 months while he was testing the output he remained hooked up to his power company. They did send him a check in the amount of $3.87 however they also gave him a big runabout for doing this.
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code_m

RE: Bill Calculator

24 Oct, 2009 - 07:39 PM
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here is the problem: if kwh < 0:

Since you set kwh using input, it is now a string, and python will not (and should not) compare a string to the int value of 0.

To fix this you must make sure the user inputs an integer and then convert that to int.

oh, and do check your spelling too.

This post has been edited by code_m: 24 Oct, 2009 - 07:41 PM
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