Error when I execute the gdm.py

Hello,

Could you help me please?? I followed your instructions but I receive this error

SyntaxError: invalid syntax
(env) jacobogarrido@MacBook-Pro gdm-master % python gdm.py /Users/jacobogarrido/gdm-master/email_mapping_list.csv
File "/Users/jacobogarrido/gdm-master/gdm.py", line 25
print "Processing %s" % (email['src'])
^
SyntaxError: invalid syntax
(env) jacobogarrido@MacBook-Pro gdm-master %