Am I being thick? File write problem.

[davef21370]

I'm slightly embarrassed to post this but...

Code: Select all

f = open("test.txt", "w")
f.write("testing\n")
f.close()

The file is created but the string isn't being written to it. Why?

Dave.

[joan]

Works OK for me.

Code: Select all

hard /ram $ ./x.py
hard /ram $ cat test.txt
testing
hard /ram $ cat x.py
#!/usr/bin/env python

f = open("test.txt", "w")
f.write("testing\n")
f.close()
hard /ram $ 

[davef21370]

Okay, it works from the command line but not from within IDLE.
The proper script only needs to be run once to grab some info off t'internet and save it so I can live with the command line, but I'm still confused as to why it won't work from IDLE.

Dave.

[joan]

Okay, it works from the command line but not from within IDLE.
The proper script only needs to be run once to grab some info off t'internet and save it so I can live with the command line, but I'm still confused as to why it won't work from IDLE.

Dave.

Perhaps IDLE is creating the file in a different directory?

You could check that by using the full path to the file (e.g. /home/dave/test.txt) rather than the relative path you are using.

[davef21370]

Perhaps IDLE is creating the file in a different directory?

I delete the file after each unsuccessful attempt and it reappears in the current directory when I retry the script. I have it running from the command line as we speak and all's well but no doubt this will rear it's ugly head again.
Thanks anyway.

Dave.

[joan]

Perhaps IDLE is creating the file in a different directory?

I delete the file after each unsuccessful attempt and it reappears in the current directory when I retry the script. I have it running from the command line as we speak and all's well but no doubt this will rear it's ugly head again.
Thanks anyway.

Dave.

The only other things I can think of is a permissions problem. But if iDLE can create the file it should be able to write to it. Perhaps try a file flush in IDLE?

[elParaguayo]

Does it make any difference if you use the 'with' context formatting, i.e.

Code: Select all

with open("test.txt", "w") as f:
    f.write("testing\n")

[paddyg]

I've come across other things (perfectly good python) that don't work with IDLE. Is there any good reason why you would persist in using it?

[davef21370]

Does it make any difference if you use the 'with' context formatting, i.e.

Code: Select all

with open("test.txt", "w") as f:
    f.write("testing\n")

Not in a position to try that at the moment as my Pi is tied up trying to save the feelings of cattle (may post more details on that depending on the outcome) but will try as soon as and update accordingly.

I've come across other things (perfectly good python) that don't work with IDLE. Is there any good reason why you would persist in using it?

I do most of my coding on the Pi and find IDLE quick and easy. The bit of C I write is done using Geany which I find sluggish and awkward.
I can understand IDLE having bugs like any other program but something as simple as writing to a file??

I'll bottom it somehow.
Thanks all.
Dave.

[paddyg]

'save' as in record the feelings or as in avoid hurting the feelings. Please tell us more, whatever the results.

[davef21370]

'save' as in record the feelings or as in avoid hurting the feelings. Please tell us more, whatever the results.

Kind of avoiding animals too much suffering.
The issue is to do with Halal meat and the way these animals are slaughtered.
The script I had problems with was to grab all UK politicians contact details and write them to a file (not that straightforward but sorted out).
The Pi is now tied up sending all of them a personal email (500+) at 6 minute intervals to avoid spamming.
I've already had lots of automated replies saying they'll respond when they get chance to read the email themselves but not holding my breath.

We can only hope.
Dave.

[paddyg]

Good luck with that (getting any kind of action from our politicians).

The only animal slaughter I have observed in detail was from a bus going from Turpan to Kashgar - so it happened to be halal. If I was a goat, I can't imagine a happier death. One second being led by my devoted goatherd past the old men and children playing happily in the village square, the next lying in large pool of blood in the dust. No cattle trucks, concrete pens, sinister men in blood stained overalls or being bludgeoned over the back of the head!

Maybe there's scope for the raspberry pi to provide low cost, virtual, pastoral environments for these beast about to meet their doom.