Tripping on Gas | Python Fiddle

# It is a common practice to initialize variables as you can in the beginning of your code.
# These variables initialized in the beginning of your code are called "global variables",
# as they can be used everywhere in the program once they are initialized here.

miles = 0.0			                           	# variable for miles to travel
mpg = 0.0										# variable for miles per gallon
gallons = 0.0									# variable for gallons of gas
price = 0.0									# variable for price of gas
cost = 0.0										# variable for cost of trip

# !! Note: Due to the nature of the formula we are using having so much division, as well as	  !! #
# !!       the variables potentially being decimal numbers, all of them are initialized as float. !! #

# This is the input stage of the program. Prompts and instructions should be given the input(.) 
# and print(.) functions. Also, input data should be stored in variables using the "=" operator.

miles = float(input("How many miles are you traveling? "))					# input prompt for miles to travel
print miles																 	# print number of miles
mpg = float(input(" How many miles per gallon does your vehicle get? "))	# input prompt for miles for gallon
print mpg																	# print mpg
price =  float(input(" What is the price of a gallon of gas? "))    		# input prompt for miles for gallon
print price																	# print price

# !! Note: There is a difference between "float" and "float(.)" ~ "float" is used in initializing !! #
# !!       a variable and "float(.) is used in converting what ever "." is to a float data type.  !! #

# This is the actual calculator part of the program. THe math is not too intensive and is based on 
# what we wrote down in the notes. Please try to follow the practice of figuring out the math first
# on paper in future programs.

gallons = round(float(miles/mpg))
cost = price*gallons

print "Gallons of gas needed:", gallons, "Cost of trip:", cost

Python Fiddle

Python Cloud IDE