# Introduction

This sample contains the code referenced in the

[Sentiment Analysis Tutorial](http://cloud.google.com/natural-language/docs/sentiment-tutorial)

within the Natural Language API Documentation. A full walkthrough of this sample

is located within the documentation.

This sample is a simple illustration of how to construct a sentiment analysis

request and process a response using the API.

## Download the Code

```

git clone sso://python-dev-samples/language/sentiment/

```

### Usage

This sample provides four sample movie reviews which you can

provide to the sample on the command line. (You can also

pass your own text files.)

```

$ python sentiment_analysis.py textfile.txt

Sentiment: polarity of -0.1 with magnitude of 6.7

```

/Library/Frameworks/Python.framework/Versions/2.7/Python

python

python

/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7

I really wanted to love 'Bladerunner' but ultimately I couldn't get

myself to appreciate it fully. However, you may like it if you're into

science fiction, especially if you're interested in the philosophical

exploration of what it means to be human or machine. Some of the gizmos

like the flying cars and the Vouight-Kampff machine (which seemed very

steampunk), were quite cool.

I did find the plot pretty slow and but the dialogue and action sequences

were good. Unlike most science fiction films, this one was mostly quiet, and

not all that much happened, except during the last 15 minutes. I didn't

understand why a unicorn was in the movie. The visual effects were fantastic,

however, and the musical score and overall mood was quite interesting.

A futurist Los Angeles that was both highly polished and also falling apart

reminded me of 'Outland.' Certainly, the style of the film made up for

many of its pedantic plot holes.

If you want your sci-fi to be lasers and spaceships, 'Bladerunner' may

disappoint you. But if you want it to make you think, this movie may

be worth the money.

What was Hollywood thinking with this movie! I hated,

hated, hated it. BORING! I went afterwards and demanded my money back.

They refused.

I neither liked nor disliked this movie. Parts were interesting, but

overall I was left wanting more. The acting was pretty good.

SSByZWFsbHkgd2FudGVkIHRvIGxvdmUgJ0JsYWRlcnVubmVyJyBidXQgdWx0aW1hdGVseSBJIGNvdWxkbid0IGdldApteXNlbGYgdG8gYXBwcmVjaWF0ZSBpdCBmdWxseS4gSG93ZXZlciwgeW91IG1heSBsaWtlIGl0IGlmIHlvdSdyZSBpbnRvCnNjaWVuY2UgZmljdGlvbiwgZXNwZWNpYWxseSBpZiB5b3UncmUgaW50ZXJlc3RlZCBpbiB0aGUgcGhpbG9zb3BoaWNhbApleHBsb3JhdGlvbiBvZiB3aGF0IGl0IG1lYW5zIHRvIGJlIGh1bWFuIG9yIG1hY2hpbmUuIFNvbWUgb2YgdGhlIGdpem1vcwpsaWtlIHRoZSBmbHlpbmcgY2FycyBhbmQgdGhlIFZvdWlnaHQtS2FtcGZmIG1hY2hpbmUgKHdoaWNoIHNlZW1lZCB2ZXJ5CnN0ZWFtcHVuayksIHdlcmUgcXVpdGUgY29vbC4KCkkgZGlkIGZpbmQgdGhlIHBsb3QgcHJldHR5IHNsb3cgYW5kIGJ1dCB0aGUgZGlhbG9ndWUgYW5kIGFjdGlvbiBzZXF1ZW5jZXMKd2VyZSBnb29kLiBVbmxpa2UgbW9zdCBzY2llbmNlIGZpY3Rpb24gZmlsbXMsIHRoaXMgb25lIHdhcyBtb3N0bHkgcXVpZXQsIGFuZApub3QgYWxsIHRoYXQgbXVjaCBoYXBwZW5lZCwgZXhjZXB0IGR1cmluZyB0aGUgbGFzdCAxNSBtaW51dGVzLiBJIGRpZG4ndAp1bmRlcnN0YW5kIHdoeSBhIHVuaWNvcm4gd2FzIGluIHRoZSBtb3ZpZS4gVGhlIHZpc3VhbCBlZmZlY3RzIHdlcmUgZmFudGFzdGljLApob3dldmVyLCBhbmQgdGhlIG11c2ljYWwgc2NvcmUgYW5kIG92ZXJhbGwgbW9vZCB3YXMgcXVpdGUgaW50ZXJlc3RpbmcuCkEgZnV0dXJpc3QgTG9zIEFuZ2VsZXMgdGhhdCB3YXMgYm90aCBoaWdobHkgcG9saXNoZWQgYW5kIGFsc28gZmFsbGluZyBhcGFydApyZW1pbmRlZCBtZSBvZiAnT3V0bGFuZC4nIENlcnRhaW5seSwgdGhlIHN0eWxlIG9mIHRoZSBmaWxtIG1hZGUgdXAgZm9yCm1hbnkgb2YgaXRzIHBlZGFudGljIHBsb3QgaG9sZXMuCgpJZiB5b3Ugd2FudCB5b3VyIHNjaS1maSB0byBiZSBsYXNlcnMgYW5kIHNwYWNlc2hpcHMsICdCbGFkZXJ1bm5lcicgbWF5CmRpc2FwcG9pbnQgeW91LiBCdXQgaWYgeW91IHdhbnQgaXQgdG8gbWFrZSB5b3UgdGhpbmssIHRoaXMgbW92aWUgbWF5CmJlIHdvcnRoIHRoZSBtb25leS4KCg==

`Bladerunner` is often touted as one of the best science fiction films ever

made. Indeed, it satisfies many of the requisites for good sci-fi: a future

world with flying cars and humanoid robots attempting to rebel against their

creators. But more than anything, `Bladerunner` is a fantastic exploration

of the nature of what it means to be human. If we create robots which can

think, will they become human? And if they do, what makes us unique? Indeed,

how can we be sure we're not human in any case? `Bladerunner` explored

these issues before such movies as `The Matrix,' and did so intelligently.

The visual effects and score by Vangelis set the mood. See this movie

in a dark theatre to appreciate it fully. Highly recommended!

import argparse

from googleapiclient import discovery

import httplib2

from oauth2client.client import GoogleCredentials

def main(movie_review_filename):

'''Run a sentiment analysis request on text within a passed filename.'''

credentials = GoogleCredentials.get_application_default().create_scoped(

['https://www.googleapis.com/auth/cloud-platform'])

http = httplib2.Http()

credentials.authorize(http)

service = discovery.build('language', 'v1beta1', http=http)

with open(movie_review_filename, 'r') as review_file:

service_request = service.documents().analyzeSentiment(

body={

'document': {

'type': 'PLAIN_TEXT',

'content': review_file.read(),

}

}

)

response = service_request.execute()

try:

polarity = response['documentSentiment']['polarity']

magnitude = response['documentSentiment']['magnitude']

except KeyError:

print("The response did not contain the expected fields.")

print('Sentiment: polarity of %s with magnitude of %s'

% (polarity, magnitude))

return 0

if __name__ == '__main__':

parser = argparse.ArgumentParser()

parser.add_argument(

'movie_review_filename',

help='The filename of the movie review you\'d like to analyze.')

args = parser.parse_args()

main(args.movie_review_filename)

import re

from sentiment_analysis import main

def test_pos(resource, capsys):

main(resource('pos.txt'))

out, err = capsys.readouterr()

polarity = re.search('polarity of (.+?) with', out)

magnitude = re.search('magnitude of (.+?)', out)

assert polarity * magnitude > 0

def test_neg(resource, capsys):

main(resource('neg.txt'))

out, err = capsys.readouterr()

polarity = re.search('polarity of (.+?) with', out)

magnitude = re.search('magnitude of (.+?)', out)

assert polarity * magnitude < 0

def test_mixed(resource, capsys):

main(resource('mixed.txt'))

out, err = capsys.readouterr()

polarity = re.search('polarity of (.+?) with', out)

assert polarity <= 0.3 is True

assert polarity >= -0.3 is True

def test_neutral(resource, capsys):

main(resource('neutral.txt'))

out, err = capsys.readouterr()

magnitude = re.search('magnitude of (.+?)', out)

assert magnitude <= 2.0 is True