[Tutor] subprocess.call not formatting date

2014-07-08 Thread Bob Williams 
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I'm using Python 2.7.6 on an openSUSE linux system.

I'm trying to convert a shell (bash) script to a python script, and 
everything's worked OK except this. The following line in the shell script

btrfs subvolume snapshot /home/bob/A3/documents /home/bob/A3/docsnaps/`date 
+%y-%m-%d_%H-%M`

creates a folder of the form

/home/bob/A3/docsnaps/14-07-08_17-32

ie. the name is a formatted date string, which is what I want.

In my python script, this

subprocess.call('btrfs', 'subvolume', 'snapshot', '/home/bob/A3/documents', 
'/home/bob/A3/docsnaps/`date +%y-%m-%d_%H-%M`')

creates a folder

/home/bob/A3/docsnaps/`date +%y-%m-%d_%H-%M`

In other words, it does not format the date, but takes the stuff between the 
backticks (`) as a string.

I tried adding shell=True, but got the following error:

Traceback (most recent call last):
  File /home/bob/bin/btrfs-backup.py, line 55, in module
subprocess.call('btrfs', 'subvolume', 'snapshot', '/home/bob/A3/documents', 
'/home/bob/A3/docsnaps/`date +%y-%m-%d_%H-%M`', shell=True)
  File /usr/lib64/python2.7/subprocess.py, line 522, in call
return Popen(*popenargs, **kwargs).wait()
  File /usr/lib64/python2.7/subprocess.py, line 658, in __init__
raise TypeError(bufsize must be an integer)
TypeError: bufsize must be an integer

Any suggestions, please?
- -- 
Bob Williams
System:  Linux 3.11.10-17-desktop
Distro:  openSUSE 13.1 (x86_64) with KDE Development Platform: 4.13.2
Uptime:  06:00am up 2 days 9:43, 5 users, load average: 0.00, 0.02, 0.05
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Re: [Tutor] subprocess.call not formatting date

2014-07-08 Thread Peter Otten 
Bob Williams wrote:

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 Hash: SHA1
 
 I'm using Python 2.7.6 on an openSUSE linux system.
 
 I'm trying to convert a shell (bash) script to a python script, and
 everything's worked OK except this. The following line in the shell script
 
 btrfs subvolume snapshot /home/bob/A3/documents
 /home/bob/A3/docsnaps/`date +%y-%m-%d_%H-%M`
 
 creates a folder of the form
 
 /home/bob/A3/docsnaps/14-07-08_17-32
 
 ie. the name is a formatted date string, which is what I want.
 
 In my python script, this
 
 subprocess.call('btrfs', 'subvolume', 'snapshot',
 '/home/bob/A3/documents', '/home/bob/A3/docsnaps/`date +%y-%m-%d_%H-%M`')
 
 creates a folder
 
 /home/bob/A3/docsnaps/`date +%y-%m-%d_%H-%M`
 
 In other words, it does not format the date, but takes the stuff between
 the backticks (`) as a string.
 
 I tried adding shell=True, but got the following error:
 
 Traceback (most recent call last):
   File /home/bob/bin/btrfs-backup.py, line 55, in module
 subprocess.call('btrfs', 'subvolume', 'snapshot',
 '/home/bob/A3/documents', '/home/bob/A3/docsnaps/`date
 +%y-%m-%d_%H-%M`', shell=True)
   File /usr/lib64/python2.7/subprocess.py, line 522, in call
 return Popen(*popenargs, **kwargs).wait()
   File /usr/lib64/python2.7/subprocess.py, line 658, in __init__
 raise TypeError(bufsize must be an integer)
 TypeError: bufsize must be an integer

That's because the second argument to call() is bufsize, and you are passing
it the string subvolume. While I suppose that

# untested
subprocess.call(btrfs subvolume snapshot /home/bob/A3/documents 
/home/bob/A3/docsnaps/`date +%y-%m-%d_%H-%M`, shell=True)

would work I suggest that you calculate the folder name in Python instead:

# untested
name = datetime.datetime.now().strftime(%y-%m-%d_%H-%M)
destpath = os.path.join(/home/bob/A3/docsnaps, name)
subprocess.call(
[btrfs, subvolume, snapshot, /home/bob/A3/documents, destpath])


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Re: [Tutor] subprocess.call not formatting date

2014-07-08 Thread Emile van Sebille 

On 7/8/2014 9:44 AM, Bob Williams wrote:

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I'm using Python 2.7.6 on an openSUSE linux system.

I'm trying to convert a shell (bash) script to a python script, and 
everything's worked OK except this. The following line in the shell script

btrfs subvolume snapshot /home/bob/A3/documents /home/bob/A3/docsnaps/`date 
+%y-%m-%d_%H-%M`

creates a folder of the form

/home/bob/A3/docsnaps/14-07-08_17-32

ie. the name is a formatted date string, which is what I want.

In my python script, this

subprocess.call('btrfs', 'subvolume', 'snapshot', '/home/bob/A3/documents', 
'/home/bob/A3/docsnaps/`date +%y-%m-%d_%H-%M`')

creates a folder

/home/bob/A3/docsnaps/`date +%y-%m-%d_%H-%M`

In other words, it does not format the date, but takes the stuff between the 
backticks (`) as a string.

I tried adding shell=True, but got the following error:

Traceback (most recent call last):
   File /home/bob/bin/btrfs-backup.py, line 55, in module
 subprocess.call('btrfs', 'subvolume', 'snapshot', 
'/home/bob/A3/documents', '/home/bob/A3/docsnaps/`date +%y-%m-%d_%H-%M`', 
shell=True)
   File /usr/lib64/python2.7/subprocess.py, line 522, in call
 return Popen(*popenargs, **kwargs).wait()
   File /usr/lib64/python2.7/subprocess.py, line 658, in __init__
 raise TypeError(bufsize must be an integer)
TypeError: bufsize must be an integer

Any suggestions, please?


Pass in the formatted string using the python datetime module.

datetime.datetime.today().strftime(%y-%m-%d_%H-%M)

see https://docs.python.org/2/library/datetime.html for more details.

Emile



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Re: [Tutor] subprocess.call not formatting date

2014-07-08 Thread Bob Williams 
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On 08/07/14 18:12, Peter Otten wrote:
 I suggest that you calculate the folder name in Python instead:
 
 # untested name =
 datetime.datetime.now().strftime(%y-%m-%d_%H-%M) destpath =
 os.path.join(/home/bob/A3/docsnaps, name) subprocess.call( 
 [btrfs, subvolume, snapshot, /home/bob/A3/documents,
 destpath])

Thank you. That worked perfectly. Once it's pointed out it is obvious
to use the python solution, but my brain is becoming less agile as I
collect more birthdays!

Bob
- -- 
Bob Williams
System:  Linux 3.11.10-17-desktop
Distro:  openSUSE 13.1 (x86_64) with KDE Development Platform: 4.13.2
Uptime:  06:00am up 2 days 9:43, 5 users, load average: 0.00, 0.02, 0.05
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