Why I can't open and read the file on python in powershell?

Question

I'm pretty sure I got the ex15_sample.txt in mystuff filefolder!

Here is the error I encounter:

IOError: [Errno 2] No such file or directory: 'ex15_sample.txt'

That's my code

from sys import argv   

script, filename = argv   

txt = open(filename)       
print "Here's your file %r:" % filename   
print txt.read()                     
print "Type the filename again:"
file_again = raw_input("> ")         

txt_again = open(file_again)           

print txt_again.read()          `

Answer 1

you can use this

    import os
    __location__ = os.path.realpath(
    os.path.join(os.getcwd(), os.path.dirname(__file__)))

    file_name = raw_input("type the file name")
    txt = open(os.path.join(__location__, filename))
    print txt.read()