diff --git a/.travis.yml b/.travis.yml
index 4a038b3a0a..4ccfb43a22 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,7 +10,7 @@ env:
       --data @- << DATA\n{
       "state": "$0",
       "description": "$1",
-      "context": "travis-ci/$NAME",
+      "context": "travis-ci/$NAME/$(python --version)",
       "target_url": "https://travis-ci.org/$TRAVIS_REPO_SLUG/jobs/$TRAVIS_JOB_ID"
       }\nDATA'
 
@@ -73,6 +73,10 @@ matrix:
 
     - env:
         - NAME=tools
+      python:
+        - '2.7'
+        - '3.5'
+        - '3.6'
       install:
         # Install dependencies
         - sudo apt-get install gcc-arm-embedded
@@ -175,7 +179,7 @@ matrix:
         - mkdir BUILD
       script:
         # Run local mbed 2 testing
-        - python2 -u tools/build_travis.py --vendor "${NAME#mbed2-}"
+        - python -u tools/build_travis.py --vendor "${NAME#mbed2-}"
     - <<: *mbed-2
       env: NAME=mbed2-STM
     - <<: *mbed-2
@@ -190,3 +194,8 @@ matrix:
       env: NAME=mbed2-NUVOTON
     - <<: *mbed-2
       env: NAME=mbed2-RENESAS
+      # Change python version here only because 3x the other jobs does not add any more coverage
+      python:
+        - '2.7'
+        - '3.5'
+        - '3.6'
diff --git a/tools/build.py b/tools/build.py
index 1d0282a973..7ada6f043e 100644
--- a/tools/build.py
+++ b/tools/build.py
@@ -17,6 +17,8 @@ limitations under the License.
 
 LIBRARIES BUILD
 """
+from __future__ import print_function, division, absolute_import
+
 import sys
 from time import time
 from os.path import join, abspath, dirname
@@ -130,7 +132,7 @@ if __name__ == '__main__':
 
     # Only prints matrix of supported toolchains
     if options.supported_toolchains:
-        print mcu_toolchain_matrix(platform_filter=options.general_filter_regex)
+        print(mcu_toolchain_matrix(platform_filter=options.general_filter_regex))
         exit(0)
 
 
@@ -184,7 +186,7 @@ if __name__ == '__main__':
             tt_id = "%s::%s" % (toolchain, target)
             if toolchain not in TARGET_MAP[target].supported_toolchains:
                 # Log this later
-                print "%s skipped: toolchain not supported" % tt_id
+                print("%s skipped: toolchain not supported" % tt_id)
                 skipped.append(tt_id)
             else:
                 try:
@@ -224,26 +226,24 @@ if __name__ == '__main__':
                         successes.append(tt_id)
                     else:
                         skipped.append(tt_id)
-                except Exception, e:
+                except Exception as e:
                     if options.verbose:
                         import traceback
                         traceback.print_exc(file=sys.stdout)
                         sys.exit(1)
                     failures.append(tt_id)
-                    print e
+                    print(e)
 
 
     # Write summary of the builds
-    print
-    print "Completed in: (%.2f)s" % (time() - start)
-    print
+    print("\nCompleted in: (%.2f)s\n" % (time() - start))
 
     for report, report_name in [(successes, "Build successes:"),
                                 (skipped, "Build skipped:"),
                                 (failures, "Build failures:"),
                                ]:
         if report:
-            print print_build_results(report, report_name),
+            print(print_build_results(report, report_name))
 
     if failures:
         sys.exit(1)
diff --git a/tools/build_travis.py b/tools/build_travis.py
index 6013aa996b..f7c7cb07ff 100644
--- a/tools/build_travis.py
+++ b/tools/build_travis.py
@@ -18,6 +18,7 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 """
+from __future__ import print_function, division, absolute_import
 
 import os
 import sys
@@ -382,11 +383,12 @@ def run_builds(dry_run, vendor):
                 toolchain_list = build["toolchains"]
                 if type(toolchain_list) != type([]): toolchain_list = [toolchain_list]
                 for toolchain in toolchain_list:
-                    cmdline = "python tools/build.py -m %s -t %s -c --silent "% (build["target"], toolchain)
+                    cmdline = ("%s tools/build.py -m %s -t %s -c --silent "%
+                               (sys.executable, build["target"], toolchain))
                     libs = build.get("libs", [])
                     if libs:
                         cmdline = cmdline + " ".join(["--" + l for l in libs])
-                    print "Executing: " + cmdline
+                    print("Executing: %s" % cmdline)
                     if not dry_run:
                         if os.system(cmdline) != 0:
                             sys.exit(1)
@@ -408,8 +410,11 @@ def run_test_linking(dry_run, vendor):
                     for test_lib in tests:
                         test_names = tests[test_lib]
                         test_lib_switch = "--" + test_lib if test_lib else ""
-                        cmdline = "python tools/make.py -m %s -t %s -c --silent %s -n %s " % (link["target"], toolchain, test_lib_switch, ",".join(test_names))
-                        print "Executing: " + cmdline
+                        cmdline = ("%s tools/make.py -m %s -t %s -c --silent %s "
+                                   "-n %s" % (sys.executable, link["target"],
+                                               toolchain, test_lib_switch,
+                                               ",".join(test_names)))
+                        print("Executing: %s" % cmdline)
                         if not dry_run:
                             if os.system(cmdline) != 0:
                                 sys.exit(1)
diff --git a/tools/toolchains/__init__.py b/tools/toolchains/__init__.py
index d1d5985895..c73ca5457c 100644
--- a/tools/toolchains/__init__.py
+++ b/tools/toolchains/__init__.py
@@ -865,7 +865,7 @@ class mbedToolchain:
     # ARM, GCC, IAR cross compatible
     def get_arch_file(self, objects):
         archive_file = join(self.build_dir, ".archive_files.txt")
-        with open(archive_file, "wb") as f:
+        with open(archive_file, "w") as f:
             o_list = []
             for o in objects:
                 o_list.append('"%s"' % o)