[Tutor] Linux variable to Python

[Lee Harr]

>import os
>>>>os.system("fec=cam`date +%Y%m%d%H%M%S`.jpg")
>0
>>>>os.system("echo $fec")
>0
>>>>os.system("mv hola.txt grabacion/$fec")
>0


Each system() call gets a fresh shell, and a fresh env ...

>>>import os
>>>os.environ['foo'] = 'bar'
>>>os.system('echo $foo')
bar
0
>>>os.system('foo=zzz')
0
>>>os.system('echo $foo')
bar
0
>>>os.system('export foo=zzz')
0
>>>os.system('echo $foo')
bar
0
>>>os.environ['foo']
'bar'


If you really need to work with environment variables
use os.environ, but I have a feeling you do not really
need that and it's going to be messy.

How about this ...

import datetime
timestamp = datetime.datetime.now().strftime('%Y%m%d%H%M%S')
filename = 'cam%s.jpg' % timestamp
os.rename('hola.txt', filename)

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