py3: Switch almost all shebang lines to use `python3`.

This causes `upgrade-zulip-from-git`, as well as a no-option run of
`tools/build-release-tarball`, to produce a Zulip install running
Python 3, rather than Python 2.  In particular this means that the
virtualenv we create, in which all application code runs, is Python 3.

One shebang line, on `zulip-ec2-configure-interfaces`, explicitly
keeps Python 2, and at least one external ops script, `wal-e`, also
still runs on Python 2.  See discussion on the respective previous
commits that made those explicit.  There may also be some other
third-party scripts we use, outside of this source tree and running
outside our virtualenv, that still run on Python 2.

docs/html_unescape.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import print_function
 
 # Remove HTML entity escaping left over from MediaWiki->rST conversion.

frontend_tests/run-casper

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import print_function
 import optparse
 import subprocess

manage.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import absolute_import
 from __future__ import print_function
 

puppet/zulip/files/nagios_plugins/zulip_app_frontend/check_cron_file

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 """ Nagios plugin paired with a cron job.  This just verifies that the
 file output by the cron job is correct.
 """

puppet/zulip/files/nagios_plugins/zulip_app_frontend/check_queue_worker_errors

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 Nagios plugin to check that none of our queue workers have reported errors.

puppet/zulip/files/nagios_plugins/zulip_app_frontend/check_rabbitmq_consumers

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 Nagios plugin to check that the rabbitmq has the correct number of consumers.

puppet/zulip/files/nagios_plugins/zulip_app_frontend/check_rabbitmq_queues

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 Nagios plugin to check that the rabbitmq queues are not overflowing as a result

puppet/zulip/files/nagios_plugins/zulip_app_frontend/check_send_receive_time

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 Script to provide information about send-receive times.

puppet/zulip/files/nagios_plugins/zulip_nagios_server/check_postgres_replication_lag

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 Nagios plugin to check the difference between the primary and

puppet/zulip/files/nagios_plugins/zulip_postgres_appdb/check_fts_update_log

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 Nagios plugin to check the length of the FTS update log.

puppet/zulip/files/nagios_plugins/zulip_postgres_common/check_postgres_backup

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from __future__ import print_function
 import subprocess

puppet/zulip/files/postgresql/pg_backup_and_purge.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from __future__ import print_function
 

puppet/zulip/files/postgresql/process_fts_updates

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Processes updates to postgres Full Text Search for new/edited messages.
 #
 # Zulip manages its postgres full-text search as follows.  When the

puppet/zulip_ops/files/nagios_plugins/zulip_zephyr_mirror/check_personal_zephyr_mirrors

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 Nagios plugin to check that Zephyr personals mirrors are forwarding.

puppet/zulip_ops/files/nagios_plugins/zulip_zephyr_mirror/check_user_zephyr_mirror_liveness

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 Nagios plugin to check that our MIT users' Zephyr mirrors are running.

puppet/zulip_ops/files/nagios_plugins/zulip_zephyr_mirror/check_zephyr_mirror

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 Nagios plugin to check that Zephyr mirror forwarding is running.

scripts/get-django-setting

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import absolute_import
 from __future__ import print_function
 

scripts/lib/create-production-venv

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import os
 import argparse

scripts/lib/email-mirror-postfix

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 Forward messages sent to the configured email gateway to Zulip.

scripts/lib/hash_reqs.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from __future__ import print_function
 

scripts/lib/log-management-command

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 import sys
 import logging
 import os

scripts/lib/queue_workers.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from __future__ import print_function
 import argparse

scripts/lib/unpack-zulip

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import print_function
 import os
 import sys

scripts/lib/upgrade-zulip

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import print_function
 import os
 import shutil

scripts/lib/upgrade-zulip-stage-2

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # This script contains the actual logic for upgrading from an old
 # version of Zulip to the new version.  upgrade-zulip-stage-2 is

scripts/lib/zulip_tools.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import print_function
 import datetime
 import errno

scripts/nagios/check-rabbitmq-consumers

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from __future__ import print_function
 import sys

scripts/nagios/check-rabbitmq-queue

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from __future__ import print_function
 import sys

scripts/purge-old-deployments

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 import sys
 import os
 import logging

scripts/restart-server

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import print_function
 import os
 import sys

scripts/setup/generate_secrets.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # This tools generates /etc/zulip/zulip-secrets.conf
 
 from __future__ import print_function

scripts/upgrade-zulip-from-git

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import print_function
 import os
 from six.moves import configparser

scripts/zulip-puppet-apply

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from __future__ import print_function
 import os

static/assets/favicon/generate

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import absolute_import
 import xml.etree.ElementTree as ET
 import subprocess

tools/check-capitalization

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import absolute_import
 from __future__ import print_function
 

tools/check-css

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import absolute_import
 from __future__ import print_function
 from lib.css_parser import parse, CssParserException

tools/check-frontend-i18n

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import absolute_import
 from __future__ import print_function
 

tools/check-issue-labels

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import print_function
 
 import requests

tools/check-provision

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import absolute_import
 from __future__ import print_function
 

tools/check-templates

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import absolute_import
 from __future__ import print_function
 from lib.template_parser import validate

tools/check-urls

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import absolute_import
 from __future__ import print_function
 

tools/clean-emoji-cache

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import absolute_import
 from __future__ import print_function
 import os

tools/clean-npm-cache

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import absolute_import
 from __future__ import print_function
 import os

tools/clean-venv-cache

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import absolute_import
 from __future__ import print_function
 import glob

tools/compile-handlebars-templates

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import absolute_import
 from __future__ import print_function
 

tools/create-test-api-docs

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import print_function
 from __future__ import absolute_import
 

tools/diagnose

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from __future__ import print_function
 from __future__ import absolute_import

tools/documentation_crawler/documentation_crawler/spiders/check_documentation.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import print_function
 
 import os

tools/documentation_crawler/documentation_crawler/spiders/check_help_documentation.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import print_function
 
 import os

tools/documentation_crawler/documentation_crawler/spiders/common/spiders.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import print_function
 
 import logging

tools/find-add-class

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import absolute_import
 from __future__ import print_function
 

tools/get-handlebar-vars

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import print_function
 from __future__ import absolute_import
 import sys

tools/html-grep

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import absolute_import
 from __future__ import print_function
 from lib.html_grep import grep

tools/js-dep-visualizer.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 """
 $ ./tools/js-dep-visualizer.py
 $ dot -Tpng var/zulip-deps.dot -o var/zulip-deps.png

tools/lib/provision.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import print_function
 import os
 import sys

tools/lib/sanity_check.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import print_function
 
 import os

tools/lint

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import print_function
 from __future__ import absolute_import
 import logging

tools/lister.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import print_function
 from __future__ import absolute_import
 

tools/minify-js

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Minifies JavaScripts, creating source maps
 

tools/pretty-print-html

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import absolute_import
 from __future__ import print_function
 from typing import List

tools/renumber-migrations

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from __future__ import absolute_import
 from __future__ import print_function

tools/replace-tarball-shebang

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from __future__ import print_function
 

tools/review

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from __future__ import print_function
 import subprocess

tools/run-dev-queue-processors

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # This script is only meant to be run from run-dev.py, which sets up the
 # environment correctly and passes the correct arguments for manage.py.  It is a

tools/run-dev.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import print_function
 from __future__ import absolute_import
 

tools/run-mypy

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from __future__ import absolute_import
 from __future__ import print_function

tools/send_github_payloads.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 import sys
 import os
 import simplejson

tools/setup/build_pygments_data.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from pygments.lexers import get_all_lexers
 import json

tools/setup/emoji/build_emoji

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # See docs/emoji.md for a high-level explanation of how this system
 # works.

tools/setup/setup_venvs.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import os
 import sys

tools/show-profile-results.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import print_function
 import sys
 import pstats

tools/stop_run_dev

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import print_function
 
 import os

tools/test-api

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import print_function
 from __future__ import absolute_import
 import os

tools/test-backend

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from __future__ import print_function
 from __future__ import absolute_import

tools/test-help-documentation.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import print_function
 from __future__ import absolute_import
 import optparse

tools/test-js-with-node

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import print_function
 import optparse
 import os

tools/test-queue-worker-reload

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from __future__ import print_function
 from __future__ import absolute_import

tools/test-run-dev

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from __future__ import print_function
 from __future__ import absolute_import

tools/test-tools

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from __future__ import absolute_import
 from __future__ import print_function

tools/test_user_agent_parsing.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import print_function
 import re
 from collections import defaultdict

tools/update-authors-json

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 """
 Fetch contributors data from Github using their API, convert it to structured
 JSON data for the /about page authors section.

tools/update-prod-static

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Updates static files for production.
 

tools/webpack

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import absolute_import
 
 import argparse

tools/zulip-export/zulip-export

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 # Copyright © 2014 Dropbox, Inc.

zerver/management/commands/deliver_email.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """\
 Deliver email messages that have been queued by various things

zerver/management/commands/email_mirror.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 Forward messages sent to the configured email gateway to Zulip.

zerver/management/commands/print_email_delivery_backlog.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 Shows backlog count of ScheduledEmail

zerver/views/test_emails.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import absolute_import
 from __future__ import print_function