Word analysis on input from a file
I would wrap the entire part of analyzing in a function:

def analyze_twees(tweets):


Then you could pass in content, from whichever source. It doesn't matter, whether the input comes from sys.stdin or a string, which you just generated. This makes the function easier to test, since you do not need passing a file into your function.
As 200_success said, 

for i in range(0, len(tweet)):


is considered poor style in Python. According to (1) you should iterate over the tweets as suggested: 

for tweet in tweets.

Your variable naming is very obscure. Think of future you coming up in 6 Months fixing a bug - do you understand your code at first glance? I doubt that.

n6.strip().lower()


One can only guess, what this is about. But if you wrote something like

tweeted_text = re.split("\s+", tweet.strip().lower())


one could imagine, what you intended to do.
You should split your concerns:


you are going to read a file line by line. So that should be one function.
you are printing something to the console. That would be another function.
you are analyzing the tweeted text. That would be the third function.

def print_tweet_analysis(dataset):
    for row in dataset:
        console_out(analyze(row))


That would be your complete algorithm in three lines of code.
If you come in 10 years from now back to your code, you unterstand, what this script is about: it takes data, analyzes it and puts the result to the console.
If you want to know, what analyze means, you look at the function and will see.
The same goes for your analyze function. You could fine grain your logic into small pieces, each sitting on the top of the other and if you read the code, you drill down as far as necessary to understand the code and maybe finding later on bugs and fixing those.

Instead of using a dictionary for your algorithm, I would recommend namedtuple. You could easily define your analysis-tuple as

Analysis = namedtuple("Analysis", "word charcount longword title uppercase")


and return simply:

return Analysis(tweet, len(tweet), len(tweet)&gt;7, tweet.istitle(), tweet.isupper())


And you are done.

If you wrote your code like this, everybody including future you would know, what this is all about.

One thing, I still do not understand is:

You are defining tweet as

tweet = re.split("\s+", n6.strip().lower())


iterating over it and checking for 

tweet[i].isupper()


Am I overseeing something or does this make no sense only to me?