Use Python3 explicitly

Makefile

@@ -207,7 +207,7 @@ endif
 # Run make without -j if this happens.
 
 %.ttx: %.ttx.tmpl $(ADD_GLYPHS) $(ALL_COMPRESSED_FILES)
-	@python $(ADD_GLYPHS) -f "$<" -o "$@" -d "$(COMPRESSED_DIR)" $(ADD_GLYPHS_FLAGS)
+	@python3 $(ADD_GLYPHS) -f "$<" -o "$@" -d "$(COMPRESSED_DIR)" $(ADD_GLYPHS_FLAGS)
 
 %.ttf: %.ttx
 	@rm -f "$@"
@@ -215,8 +215,8 @@ endif
 
 $(EMOJI).ttf: $(EMOJI).tmpl.ttf $(EMOJI_BUILDER) $(PUA_ADDER) \
 	$(ALL_COMPRESSED_FILES) | check_vs_adder
-	@python $(EMOJI_BUILDER) $(SMALL_METRICS) -V $< "$@" "$(COMPRESSED_DIR)/emoji_u"
-	@python $(PUA_ADDER) "$@" "$@-with-pua"
+	@python3 $(EMOJI_BUILDER) $(SMALL_METRICS) -V $< "$@" "$(COMPRESSED_DIR)/emoji_u"
+	@python3 $(PUA_ADDER) "$@" "$@-with-pua"
 	@$(VS_ADDER) -vs 2640 2642 2695 --dstdir '.' -o "$@-with-pua-varsel" "$@-with-pua"
 	@mv "$@-with-pua-varsel" "$@"
 	@rm "$@-with-pua"

add_aliases.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2017 Google Inc. All rights reserved.
 #

add_emoji_gsub.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2014 Google Inc. All rights reserved.
 #

add_glyphs.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """Extend a ttx file with additional data.
 

add_svg_glyphs.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2015 Google, Inc. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");

check_emoji_sequences.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2016 Google Inc. All rights reserved.
 #

collect_emoji_svg.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2015 Google, Inc. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");

flag_glyph_name.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2014 Google Inc. All rights reserved.
 #

flag_info.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 #
 # Copyright 2016 Google Inc. All rights reserved.
 #

gen_version.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2015 Google Inc. All rights reserved.
 #

generate_emoji_html.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2016 Google Inc. All rights reserved.
 #

generate_emoji_name_data.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-#
 #
 # Copyright 2015 Google Inc. All rights reserved.

generate_emoji_thumbnails.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2017 Google Inc. All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");

generate_test_html.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2015 Google, Inc. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");

map_pua_emoji.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2014 Google Inc. All rights reserved.
 #

materialize_emoji_images.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2016 Google Inc. All rights reserved.
 #

strip_vs_from_filenames.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2017 Google Inc. All rights reserved.
 #

svg_cleaner.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2015 Google, Inc. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");