Python Random Number File Writer

need some help with this problem!

Write a program that writes a series of random numbers to a file. Each random number should be in the range of 100 through 500. The application should let the user specify how many random numbers the file will hold.

sample outputs

Enter the name of the file to which results should be written:

ran_numbers.txt

Enter the number of random numbers to be written to the file:

20

20 random numbers have been written into the output file.