Subprocess.run



In [1]:

    
import subprocess as sp



In [25]:

    
sp.run(['ls', '-a'])









    Out[25]:





CompletedProcess(args=['ls', '-a'], returncode=0)



In [26]:

    
p = sp.run(['ls', '-ap'], stdout=sp.PIPE)



In [27]:

    
print(p.stdout.decode())









    



./
../
.ipynb_checkpoints/
Misc.ipynb
PEP-448.ipynb
PEP-465.ipynb



In [32]:

    
p = sp.run(['ls', 'T___T'])
p.returncode









    Out[32]:





1



In [34]:

    
p = sp.run(['ls', 'T___T'], check=True)









    



---------------------------------------------------------------------------
CalledProcessError                        Traceback (most recent call last)
<ipython-input-34-a518307a790d> in <module>()
----> 1 p = sp.run(['ls', 'T___T'], check=True)

/Users/liang/.pyenv/versions/miniconda3-3.16.0/envs/sci35/lib/python3.5/subprocess.py in run(input, timeout, check, *popenargs, **kwargs)
    709         if check and retcode:
    710             raise CalledProcessError(retcode, process.args,
--> 711                                      output=stdout, stderr=stderr)
    712     return CompletedProcess(process.args, retcode, stdout, stderr)
    713 

CalledProcessError: Command '['ls', 'T___T']' returned non-zero exit status 1



In [42]:

    
p = sp.run(['touch', '/dev/relationship'], stderr=sp.PIPE)



In [41]:

    
p.stderr









    Out[41]:





b'touch: /dev/relationship: Permission denied\n'

Byte formatting



In [43]:

    
'(%(eye)s%(nose)s%(eye)s)' % {'nose': '.', 'eye': '^'}









    Out[43]:





'(^.^)'



In [44]:

    
b'(%(eye)s%(nose)s%(eye)s)' % {b'nose': b'.', b'eye': b'^'}  # using %s in bytes is deprecated (= %b)









    Out[44]:





b'(^.^)'



In [ ]:

    
b'(%(eye)b%(nose)b%(eye)b)' % {b'nose': b'.', b'eye': b'^'}



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b'The unicode of kanji %a' % "漢字"



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b'The unicode of kanji %r' % "漢字"  # using %r in bytes is deprecated (= %a)



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b'The unicode of kanji %b' % repr("漢字").encode('ascii', 'backslashreplace')



In [ ]:

    
b'The unicode of kanji %b' % "漢字".encode('utf8')



In [ ]:

    
b'The unicode of kanji \xe6\xbc\xa2\xe5\xad\x97'.decode('utf8')



In [45]:

    
b = 'Hello 你好'.encode()
b









    Out[45]:





b'Hello \xe4\xbd\xa0\xe5\xa5\xbd'



In [46]:

    
b.hex()









    Out[46]:





'48656c6c6f20e4bda0e5a5bd'



In [47]:

    
bytes.fromhex(
    # H  e  l  l  o 
    '48 65 6C 6C 6F 20'
    #    你     好
    'E4BDA0 E5A5BD'
).decode()









    Out[47]:





'Hello 你好'



In [48]:

    
b'({0}{1}{0})'.format('^', '.')









    



---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-48-f1ae184c305e> in <module>()
----> 1 b'({0}{1}{0})'.format('^', '.')

AttributeError: 'bytes' object has no attribute 'format'



In [ ]: