Syntax error while executing "run_lefse.py hmp_aerobiosis_small.in hmp_aerobiosis_small.res"

[Mohamad Khairil]

Good day.

I am Mohamad Khairil Radzali, a postgraduate student from Universiti =
Putra Malaysia, Malaysia. I was trying to run the tutorial given by the =
website (https://bitbucket.org/biobakery/biobakery/wiki/lefse =
<https://bitbucket.org/biobakery/biobakery/wiki/lefse>) using Homebrew =
(installed) but somehow encountered an issue.

While I was executing below command:

$ python run_lefse.py hmp_aerobiosis_small.in hmp_aerobiosis_small.res

It appeared to be an issue as in attached file. 

File "run_lefse.py", line 66

    print "Testing feature",str(nf),": ",feat_name,

                          ^

SyntaxError: invalid syntax

How do I resolve this?