why cant i change directories in python? -

i'm trying change directories in python. first tried:

>>> os.getcwd() 

and got:

traceback (most recent call last):   file "<stdin>", line 1, in <module> nameerror: name 'os' not defined 

i tried

>>> os.chir('/directory/i/want/to/change/to') 

but still got

nameerror: name 'os' not defined 

how define operating system?

you need import os module first:

import os os.getcwd()