Often I needed to visualise functions associated with set of genes. word_cloud is very handy word cloud generator written in Python.
Install it

sudo pip install git+git://github.com/amueller/word_cloud.git

Incorporate it into your Python code

import matplotlib.pyplot as plt
from wordcloud import WordCloud
 
text = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."

wordcloud = WordCloud().generate(text)
img=plt.imshow(wordcloud)
plt.axis("off")
plt.show()
 
#or save as png
img.write_png("wordcloud.png")

It’s implemented in metaPhOrs.