TypeError: not all arguments converted during string formatting python 3

Question

Ballistic calculator for Computer science class. I can't figure out why it keeps giving the following error message :

travel_time = range % velocity
TypeError: not all arguments converted during string formatting


print ("Welcome to the Laird Industries Ballistic Calculator")
range = raw_input("What is the approximate distance to your target? (m)")
velocity = raw_input("What is the muzzle velocity of the projectile? ")

def time_to_target():
    travel_time = range % velocity
    print "Travel duration {0}".format(travel_time)
#
time_to_target()
#

Thanks for the info. Fixed code :

range_to_target = raw_input("What is the approximate distance to your target? (m)")
velocity = raw_input("What is the muzzle velocity of the projectile? ")

def time_to_target():
    travel_time = float(range_to_target) / float(velocity)
    print "Travel duration {0}".format(travel_time)
#
time_to_target()
#

Are you sure you want % (the remainder operator) rather than / (the division operator) here? — Mark Dickinson
– Mark Dickinson, Commented Oct 15, 2014 at 13:25

John Zwinck · Accepted Answer · 2014-10-15 02:40:59Z

3

It's because range is a string (you got it from input()) and % for strings in Python is a special formatting operator. You just need to convert to a numeric data type, something like this:

travel_time = float(range) % float(velocity)

answered Oct 15, 2014 at 2:40

John Zwinck

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Comments

Sudesh · Accepted Answer · 2014-10-15 13:20:10Z

0

raw_input() returns user input as string. So your range and velocity are string and so you can not use % operator. So convert range and velocity to float.
range is a predefined in python. So you should not use it as variable name

answered Oct 15, 2014 at 13:20

Sudesh

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