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You can use os.mkdir:

sage: !ls -la 
total 8
drwxrwxr-x  2 mcneil mcneil 4096 Aug 21 12:24 .
drwxr-xr-x 88 mcneil mcneil 4096 Aug 21 12:24 ..
sage: s = "somedirectoryname"
sage: os.mkdir(s)            
sage: !ls -la                
total 12
drwxrwxr-x  3 mcneil mcneil 4096 Aug 21 12:24 .
drwxr-xr-x 88 mcneil mcneil 4096 Aug 21 12:24 ..
drwxrwxr-x  2 mcneil mcneil 4096 Aug 21 12:24 somedirectoryname

You can use os.mkdir: (see docs here):

sage: !ls -la 
total 8
drwxrwxr-x  2 mcneil mcneil 4096 Aug 21 12:24 .
drwxr-xr-x 88 mcneil mcneil 4096 Aug 21 12:24 ..
sage: s = "somedirectoryname"
sage: os.mkdir(s)            
sage: !ls -la                
total 12
drwxrwxr-x  3 mcneil mcneil 4096 Aug 21 12:24 .
drwxr-xr-x 88 mcneil mcneil 4096 Aug 21 12:24 ..
drwxrwxr-x  2 mcneil mcneil 4096 Aug 21 12:24 somedirectoryname

You can use os.mkdir (see docs here):

sage: !ls -la -a  total 8
drwxrwxr-x .  2 mcneil mcneil 4096 Aug 21 12:24 .
drwxr-xr-x 88 mcneil mcneil 4096 Aug 21 12:24 ..
sage: s = "somedirectoryname"
sage: os.mkdir(s)            
sage: !ls -la -a   total 12
drwxrwxr-x .  3 mcneil mcneil 4096 Aug 21 12:24 .
drwxr-xr-x 88 mcneil mcneil 4096 Aug 21 12:24 ..
drwxrwxr-x ..  2 mcneil mcneil 4096 Aug 21 12:24 somedirectoryname