I'm much too lazy to save and edit the image, so i'll let it be crazy till i feel motivated to edit it to scale.
# fuelEfficiency.py
# by Douglas Selby, on 9-29-09
# Program will compute the fuel efficiency of a multi-leg journey
# First prompt for starting odometer reading (distance, in miles)
# Get information about series of legs
# For each leg:
# User enters current odometer reading and amount of gas used
# User signals end of the trip with a blank line
# Returns out miles per gallon for each leg and total miles per gallon for whole trip
## ----Start converting program components of main definitions---- ##
# Asks for what the odometer reading is for the current leg
def ask():
data = raw_input("What is the odometer reading (miles) and the gas that has been used (gallons)? Seperate with a space. ")
return data
# calls ask, only called if user inputted data incorrectly
def askAgain():
print "The information that you entered was incorrect. Please try again.\n"
data = ask()
return data
# Converts string 'number' into an integer value
def efloat(number):
number = eval(number)
number = float(number)
# print type(number)
# number is now 'float'
return number
## ----End sub-program components of main---- ##
## ----Start main definition---- ##
def main():
# Initialization
blankline = ""
data = ""
oList = []
mpgList = []
sumGas = 0
odom = 0
gas = 0
leg = 0
# Spacer to recognize program start
print "-- Trip start --\n"
# Prompt for starting odometer reading (starto)
odom = raw_input("What is the starting odometer reading (miles)? ")
# If user does not enter a value, prompts again
while odom == blankline:
odom = raw_input("You must enter a starting odometer reading: ")
# If user enters an invalid entry (any negative number), prompts again
while odom < "0":
print "Your odometer cannot have a negative setting."
odom = raw_input("Please check that you are not driving a future or alien vehicle and re-enter the starting odometer reading: ")
# Convert odom to an float value
odom = efloat(odom)
oList.append(odom)
# Start leg 1 prompt (leg 1 only required leg)
print "\n-- First Leg (or final destination) --"
data = ask()
while data != blankline:
leg += 1
temp = data.split()
while len(temp) != 2:
data = askAgain()
temp = data.split()
odom = temp[0]
gas = temp[1]
odom = efloat(odom)
gas = efloat(gas)
oList.append(odom)
sumGas += gas
mpg = (odom - oList[leg-1]) / gas
mpgList.append(mpg)
print "\n-- Next Leg (or final destination) --"
data = ask()
# Spacer to recognize program start
print "-- Trip end -\n"
if leg != 0:
# Get total average mpg
fmpg = (oList[leg-1]-oList[0])/sumGas
# Print final answers
print "-- Final fuel efficiency results (in miles per gallon, or mpg) --\n"
for i in range(leg):
print "Leg %0d - %0.2f mpg\n" % (i+1, mpgList[i])
print "The fuel efficiency for the entire trip is %0.2f mpg" % (fmpg)
else:
print "No leg data was entered; did you go anywhere? Restart the program when you actually want to track your journey mileage."
## ----End main definition---- ##
## ----Start program---- ##
## ----Run main function run---- ##
main()
## ----End main function run---- ##
## ----End program---- ##
# Standard Deviation of the Mean calculator
# Created 5.17.2009, by Douglas W. Selby (selby.douglas@gmail.com)
# Version 1.0
from math import *
def main():
n = input("How many entries? ")
i = 1
average = 0
entryList = []
while(i<=n):
entry = input("entry? ")
entryList.append(entry)
print entryList
average = average + entry
i = i+1
average = average/n
i=0
sum = 0
while(i<=n-1):
sum = sum + (entryList[i]-average)**2
i = i+1
deviation = sqrt(sum/(n-1))
print "Standard Deviation of the Mean = ", deviation
main()
