python - Traceback: AttributeError:addinfourl instance has no attribute '__exit__' -

from urllib import urlopen urlopen('https://www.python.org') story:     story_words = []     line in story:         line_words = line.split()         words in line_words:             story_words.append(word) 

error message:

traceback (most recent call last):   file "<stdin>", line 1, in <module> attributeerror: addinfourl instance has no attribute '__exit__' 

i not understanding what's wrong above code , how resolve it?

system information : python 2.7 in ubuntu oracle virtual box.

that error caused line:

with urlopen('https://www.python.org') story: 

to fix this, replace line following line:

story = urlopen('https://www.python.org') 

---

additional info on error

why happening?

to make with ... as statement work object, context manager object must implemented. means object/class must have __enter__ , __exit__ methods defined it.

the attributeerror raised because there isn't context manager implemented urlopen (i.e. doesn't have __enter__ , __exit__ methods defined it).

since author of urlopen hasn't implemented that, there's not can it, except for:

1. either don't use with...as statement.
2. or, if must, can use contextlib.closing (thanks @vaultah provided solution in comments below). automatically implements context manager object, thereby allowing use with...as statement.

how implement context manager?

you can implement context manager defining __enter__ , __exit__ methods object/class.

do read these docs on context managers.

example:

# example without context manager # raise attributeerror  >>> class person(object):         def __init__(self, name):             self.name = name  >>> person("john doe") p:         print p.name  >>> attributeerror: __exit__ 

above, got attributeerror because haven't implemented context manager person. below how context manager implemented.

 # implementing context manager   >>> class person(object):         def __init__(self, name):             self.name = name          def __enter__(self):             # value returned method              # assigned variable after ``as``             return self          def __exit__(self, exc_type, exc_value, exc_traceback ):             # returns either true or false             # don't raise exceptions in method             return true  >>> person("john doe") p:         print p.name  >>> "john doe"