Import future print in case of python2 environment

bin/extract_figures.py

@@ -6,7 +6,7 @@ import glob
 from optparse import OptionParser
 
 from util import Reporter, read_markdown, IMAGE_FILE_SUFFIX
-
+from __future__ import print_function
 
 def main():
     """Main driver."""

bin/lesson_initialize.py

@@ -5,7 +5,7 @@
 
 import sys
 import os
-
+from __future__ import print_function
 
 ROOT_AUTHORS = '''\
 FIXME: list authors' names and email addresses.

bin/repo_check.py

@@ -11,6 +11,7 @@ import re
 from optparse import OptionParser
 
 from util import Reporter, load_yaml, require
+from __future__ import print_function
 
 # Import this way to produce a more useful error message.
 try:

bin/util.py

@@ -2,6 +2,7 @@ import sys
 import os
 import json
 from subprocess import Popen, PIPE
+from __future__ import print_function
 
 # Import this way to produce a more useful error message.
 try:

bin/workshop_check.py

@@ -9,7 +9,7 @@ import os
 import re
 from datetime import date
 from util import Reporter, split_metadata, load_yaml, check_unwanted_files
-
+from __future__ import print_function
 
 # Metadata field patterns.
 EMAIL_PATTERN = r'[^@]+@[^@]+\.[^@]+'