Difficulty w/json keys

[Red]

My apologies for what is probably a simple question to most on this
group. However, I am new to python and very new to json.

I am trying to read in a json file from a twitter download. There are,
generally, two types of lines: those lines with "text" and the other
lines.  I am only interested in the lines with "text".  I am also only
interested in lines with "lang":"en", but I haven't gotten far enough
to implement that condition in the code snippets below.

I have gotten Option 2 below to sort of work.  It works fine for
'text', but doesn't work for 'lang'.

FWIW I am using Python 2.6.4

Can someone tell me what I'm doing wrong with the following code
snippets and/or point me toward an example of an implementation?

Many thanks for your patience.

---------------------------------

import sys
import json

f = open(sys.argv[1])

#option 1

for line in f:
	j = json.loads(line)
	try:
		'text' in j
		print "TEXT:  ", j
	except:
		print "EXCEPTION:   ", j
		continue
	else:
		text=j['text']
----snip --------




#option 2	does basically the same thing as option 1 , but also looks
for 'lang'

for line in f:
	j = json.loads(line)
	if 'text' in j:
		if 'lang' in j:
			lang = j['lang']
			print "language", lang
		text = j['text']
----snip --------

------ Two Sample Twitter lines -------------

{"text":"tech managers what size for your teams? better to have 10-20
ppl per manager or 2-5 and have the managers be more hands
on?","in_reply_to_user_id":null,"coordinates":null,"geo":null,"created_at":"Thu
Apr 22 17:35:42 +0000 2010","contributors":null,"source":"<a href=
\"http://twitterfeed.com\" rel=\"nofollow\">twitterfeed</
a>","in_reply_to_status_id":null,"place":null,"truncated":false,"in_reply_to_screen_name":null,"user":
{"favourites_count":
0,"profile_text_color":"000000","time_zone":"Eastern Time (US &
Canada)","created_at":"Tue Oct 27 19:50:51 +0000
2009","statuses_count":
286,"notifications":null,"profile_link_color":"0000ff","description":"I
write code and talk to people.
","lang":"en","profile_background_image_url":"http://s.twimg.com/a/
1271891196/images/themes/theme1/bg.png","profile_image_url":"http://
s.twimg.com/a/1271891196/images/
default_profile_0_normal.png","location":"Near the
water.","contributors_enabled":false,"following":null,"geo_enabled":false,"profile_sidebar_fill_color":"e0ff92","profile_background_tile":false,"screen_name":"sstatik","profile_sidebar_border_color":"87bc44","followers_count":
40,"protected":false,"verified":false,"url":"http://
elliotmurphy.com/","name":"statik","friends_count":18,"id":
85646316,"utc_offset":-18000,"profile_background_color":"9ae4e8"},"id":
12651537502,"favorited":false}
{"delete":{"status":{"id":12650137902,"user_id":128090723}}}