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## Sample Code

`# windchill`

`def windchill(t, v):`
`    """`
`    windchill(t,v) takes a temperature and wind speed and returns the`
`    windchill factor.`

`    t = temperature in Farhenheit`
`    v = wind speed in miles per hour`

`    >>> windchill(5,10)`
`    -9.737344294197483`
`    >>> windchill(20,20)`
`    4.242781599820461`
`    >>> windchill(-10,50)`
`    -45.32064601872968`
`    """`
`    return 35.74 + 0.6215 * t - 35.75 * v**0.16 + 0.4275 * t * v**0.16`

`def getuservalue(s):`
`    while True:`
`        try:`
`            val = int(raw_input(s))`
`            return val`
`        except ValueError:`
`            print "Error! - Please enter an integer."`
`        `

`def main():`
`    tmin = getuservalue('Please enter starting temperature in degrees Fahrenheit: ')`
`    tmax = getuservalue('Please enter ending temperature: ')`
`    tinc = getuservalue('Please enter an increment value for temperature: ')`

`    vmin = getuservalue('\nPlease enter a starting wind speed in miles per hour: ')`
`    vmax = getuservalue('Please enter an ending wind speed: ')`
`    vinc = getuservalue('Please enter an increment value for wind speed: ')`

`    # Build a windchill lookup table`
`    print('\n\n')`

`    # output column header`
`    print "T(degF)\t",`
`    for v in range(vmin, vmax+vinc,vinc):   # adding increment to the max value to`
`        print v,"mph\t",                    # ensure we output the max value or greater`

`    print "\n======\t",`
`    for v in range(vmin, vmax+vinc,vinc):`
`        print "======\t",`

`    # print the table`
`    print`
`    for t in range(tmin, tmax+tinc, tinc):`
`        print t,`
`        for v in range(vmin, vmax+vinc, vinc):`
`            print "\t%-4.2f"%(windchill(t,v)),`
`        print`
`    `
`    temp = raw_input('[press ENTER to quit]')`
`    `
`    `
`if __name__ == "__main__":`
`    import doctest`
`    doctest.testmod()`
`    main()`