(brutally) Add color to a given text according to 'sentiment analysis' with Pattern (http://www.clips.ua.ac.be/pattern).

colorize.py

from pattern.en import sentiment
import colors

items = sentiment.viewitems()

# some text
text = ("Then, the module's variables, functions, and classes will be available to the caller through "
    "the module’s namespace, a central concept in programming that is particularly helpful and "
    "powerful in Python. Thanks to the way imports and modules are handled in Python, it is "
    "relatively easy to structure a Python project. Easy, here, means that you do not have many "
    "constraints and that the module importing model is easy to grasp. Therefore, you are left "
    "with the pure architectural task of crafting the different parts of your project and their "
    "interactions. A few years back, Hadoop was essentially MapReduce, a batch-oriented system for "
    "processing large amounts of data, leading people to mistakenly conflate Hadoop with Big Data "
    "and Big Data with lots and lots of data. But if the market was confused then, it's far worse "
    "today. Because Hadoop is taking on all sorts of capabilities that just two years ago were "
    "considered impossible.")

assess = sentiment(text).assessments

colored = text
c = 0
for a in assess:    
    c += 1
    col = round(abs(a[1]) * 255)
    if a[1] > 0:
        color = '#%s' % colors.rgb(0,col,0).hex
    else:
        color = '#%s' % colors.rgb(col,0,0).hex
    colored = colored.replace(a[0][0],'<span style="color:'+color+'">'+a[0][0]+'</span>')

out = open('out.html','w')
out.write('<span style="font-size:1.25em;font-family:Arial;color:#BBB">' + colored + '</span>') 
out.close()

Note that you might need to do the following:

pip install pattern

pip install colors.py