Having trouble with File I/O

Question

I was trying to make a simple program. All it was suppose to do was create a file called noah.txt and write hello to it then print the contents to it. But, when I ran it my computer started beeping and outputted nonsense:

0╥+☻    guru99.txt","w+") existing: f=open("guru99.txt", "a+")

f = open("noah.txt","w+")

f.write("hello")

fl = f.readlines()

for x in fl:

        print(x)

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My code:

# new: f= open("guru99.txt","w+") existing: f=open("guru99.txt", "a+")
f = open("noah.txt","w+")
f.write("hello")
fl = f.readlines()
for x in fl:
    print(x)
f.close()

Python: 2.7.9 (default, Dec 10 2014, 12:28:03) [MSC v.1500 64 bit (AMD64)]. Windows 7 64 bit. Why is this happening?

Could you please add your actual code here Noah, along with a better description of the error or issue that is occurring? — miradulo, Mar 04 '17 at 01:45
Please, always remember to add your code _verbatim_ in the question. — Christian Dean, Mar 04 '17 at 01:46
@NoahCristino You already had put your code directly in the question? — Christian Dean, Mar 04 '17 at 01:48
I think it's safe to say that you don't have a proper install of Python running, or that your terminal doesn't have character codes that interface with Python properly. Not sure why that would lead to a beeping. — Akshat Mahajan, Mar 04 '17 at 01:56
Possible duplicate of [Python Sound ("Bell")](http://stackoverflow.com/questions/13941/python-sound-bell) — DYZ, Mar 04 '17 at 02:27
@DYZ It isn't a duplicate. That question is not even close. I don't want to make it beep it is just randomly doing it. — Noah Cristino, Mar 04 '17 at 14:12

score 2 · Accepted Answer · edited May 23 '17 at 11:46

This looks to me like you're opening a file, writing to it, then attempting to read beyond the end of the file with the same file handle. (The beeps are your terminal/command interpreter being hit with an unprintable character, probably from the binary *.pyc file in the same directory.)

Python probably shouldn't let you do that at all, but I suspect the underlying IO libs on Windows.

This looks like a good answer: Mixing read() and write() on Python files in Windows

You could probably do something like:

# new: f= open("guru99.txt","w+") existing: f=open("guru99.txt", "a+")
f = open("noah.txt","w+")
f.write("hello")
# Now reset back to the start of the file
f.seek(0)
fl = f.readlines()
for x in fl:
    print(x)
f.close()

Might be good to read up on context managers ("with") as well: https://en.wikibooks.org/wiki/Python_Programming/Context_Managers

Thanks for actually taking the question seriously and not reporting it as a duplicate with a post that is not even close to the same. Adding seek made it work fine! — Noah Cristino, Mar 04 '17 at 14:14
Great! Yes, the linked answer is not identical, but it does have a lot of useful information that made me suspicious of the behaviour you were seeing. Have fun with Python! — glennji, Mar 05 '17 at 00:06

Having trouble with File I/O

1 Answers1