Question

How do I get my loop to write to the file until I stop the loop?

For example

outFile = "ExampleFile.txt", "w"
example = raw_input(" enter number. Negative to stop ")
while example >= 0:
    example = raw_input("enter number. Negative to stop")
    outFile.write("The number is", example,+ "\n")

I feel like im hitting it close but I’m not sure. I wasn’t sure how to search for this question in paticular. Sorry, I keep getting a error stating that the function takes 1 argument, when I enter more than 2.

import os.path
outFile = open("purchases.txt","w")
quantity = float(raw_input("What is the quantity of the item :"))
cost = float(raw_input("How much is each item :"))


while quantity and cost >= 0:
    quantity = float(raw_input("What is the quantity of the item :"))
    cost = float(raw_input("How much is each item :"))
    total = quantity * cost
    outFile.write("The quantity is %s\n"%(quantity))
    outFile.write("the cost of the previous quality is $s\n" %(cost))
    outFile.close()
    outFile = open("purchases.txt","a")
    outFile.write("The total is ",total)
    outFile.close()

Answer 1

when you write:

outFile = "ExampleFile.txt", "w"

you create a tuple, not a file object.

You probably meant to write:

outFile = open('ExampleFile.txt','w')

Of course, you could do this a little better using a context manager:

with open('ExampleFile.txt','w') as outFile:
    #...

---

Your code has a second error:

outFile.write("The number is", example,+ "\n")

baring the SyntaxError (,+), file.write takes only 1 argument. You probably wanted something like:

outFile.write("The number is {0}\n".format(example))

or using the old style of string formatting (as requested):

outFile.write("The number is %s\n"%(example))