fix: Remove PY2 compatibility code

* Set Python requires Python 3.6+ but < Py4
* Remove six from dependencies
* Use click.confirm instead of self implemented confirm code
* Fix imports for 3.6+ compatibility

References for updated imports:
* https://docs.python.org/3/library/configparser.html
* https://docs.python.org/3/library/urllib.request.html#legacy-interface
* https://docs.python.org/3/library/urllib.parse.html#urllib.parse.urlparse
* https://docs.python.org/3/library/importlib.html#importlib.reload

bench/app.py

@@ -1,6 +1,3 @@
-# imports - compatibility imports
-from __future__ import print_function
-
 # imports - standard imports
 import json
 import logging
@@ -390,8 +387,9 @@ def get_repo_dir(app, bench_path='.'):
 
 def switch_branch(branch, apps=None, bench_path='.', upgrade=False, check_upgrade=True):
 	import git
-	from six.moves import reload_module
+	import importlib
 	from bench.utils import update_requirements, update_node_packages, backup_all_sites, patch_sites, build_assets, post_upgrade
+
 	apps_dir = os.path.join(bench_path, 'apps')
 	version_upgrade = (False,)
 	switched_apps = []
@@ -437,7 +435,7 @@ def switch_branch(branch, apps=None, bench_path='.', upgrade=False, check_upgrad
 	if version_upgrade[0] and upgrade:
 		update_requirements()
 		update_node_packages()
-		reload_module(bench.utils)
+		importlib.reload(bench.utils)
 		backup_all_sites()
 		patch_sites()
 		build_assets()

bench/commands/make.py

@@ -39,12 +39,12 @@ def init(path, apps_path, frappe_path, frappe_branch, no_procfile, no_backups, c
 	except SystemExit:
 		pass
 	except Exception as e:
-		import os, shutil, time, six
+		import os, shutil, time
 		# add a sleep here so that the traceback of other processes doesnt overlap with the prompts
 		time.sleep(1)
 		print(e)
 		log(f"There was a problem while creating {path}", level=2)
-		if six.moves.input("Do you want to rollback these changes? [Y/n]: ").lower() == "y":
+		if click.confirm("Do you want to rollback these changes?"):
 			print(f'Rolling back Bench "{path}"')
 			if os.path.exists(path):
 				shutil.rmtree(path)

bench/commands/setup.py

@@ -154,7 +154,6 @@ def setup_requirements(node=False, python=False):
 @click.option("--port", help="Port on which you want to run bench manager", default=23624)
 @click.option("--domain", help="Domain on which you want to run bench manager")
 def setup_manager(yes=False, port=23624, domain=None):
-	from six.moves import input
 	from bench.utils import get_sites
 	from bench.config.common_site_config import get_config
 	from bench.config.nginx import make_bench_manager_nginx_conf
@@ -162,11 +161,7 @@ def setup_manager(yes=False, port=23624, domain=None):
 	create_new_site = True
 
 	if "bench-manager.local" in os.listdir("sites"):
-		ans = input("Site already exists. Overwrite existing site? [Y/n]: ").lower()
-		while ans not in ("y", "n", ""):
-			ans = input("Please enter 'y' or 'n'. Site already exists. Overwrite existing site? [Y/n]: ").lower()
-		if ans == "n":
-			create_new_site = False
+		create_new_site = click.confirm("Site already exists. Overwrite existing site?")
 
 	if create_new_site:
 		exec_cmd("bench new-site --force bench-manager.local")

bench/config/common_site_config.py

@@ -71,7 +71,7 @@ def update_config_for_frappe(config, bench_path):
 	# TODO Optionally we need to add the host or domain name in case dns_multitenant is false
 
 def make_ports(bench_path):
-	from six.moves.urllib.parse import urlparse
+	from urllib.parse import urlparse
 
 	benches_path = os.path.dirname(os.path.abspath(bench_path))
 

bench/config/lets_encrypt.py

@@ -106,7 +106,7 @@ def create_dir_if_missing(path):
 
 
 def get_certbot():
-	from six.moves.urllib.request import urlretrieve
+	from urllib.request import urlretrieve
 
 	certbot_path = get_certbot_path()
 	create_dir_if_missing(certbot_path)

bench/config/nginx.py

@@ -6,7 +6,6 @@ import string
 
 # imports - third party imports
 import click
-from six import string_types
 
 # imports - module imports
 import bench
@@ -218,7 +217,7 @@ def get_sites_with_config(bench_path):
 		if dns_multitenant and site_config.get('domains'):
 			for domain in site_config.get('domains'):
 				# domain can be a string or a dict with 'domain', 'ssl_certificate', 'ssl_certificate_key'
-				if isinstance(domain, string_types):
+				if isinstance(domain, str):
 					domain = { 'domain': domain }
 
 				domain['name'] = site

bench/config/redis.py

@@ -9,7 +9,7 @@ from bench.config.common_site_config import get_config
 
 
 def generate_config(bench_path):
-	from six.moves.urllib.parse import urlparse
+	from urllib.parse import urlparse
 
 	config = get_config(bench_path)
 

bench/config/supervisor.py

@@ -67,8 +67,7 @@ def get_supervisord_conf():
 
 def update_supervisord_config(user=None, yes=False):
 	"""From bench v5.x, we're moving to supervisor running as user"""
-	from six.moves import configparser
-
+	import configparser
 	from bench.config.production_setup import service
 
 	if not user:

bench/tests/test_base.py

@@ -8,14 +8,11 @@ import sys
 import traceback
 import unittest
 
-# imports - third party imports
-from six import PY2
-
 # imports - module imports
 import bench
 import bench.utils
 
-if PY2:
+if sys.version_info.major == 2:
 	FRAPPE_BRANCH = "version-12"
 else:
 	FRAPPE_BRANCH = "develop"

bench/utils.py

@@ -641,11 +641,9 @@ def update_npm_packages(bench_path='.'):
 
 		if os.path.exists(package_json_path):
 			with open(package_json_path, "r") as f:
-				from six import iteritems
-
 				app_package_json = json.loads(f.read())
 				# package.json is usually a dict in a dict
-				for key, value in iteritems(app_package_json):
+				for key, value in app_package_json.items():
 					if not key in package_json:
 						package_json[key] = value
 					else:
@@ -978,7 +976,7 @@ def find_benches(directory=None):
 
 def migrate_env(python, backup=False):
 	import shutil
-	from six.moves.urllib.parse import urlparse
+	from urllib.parse import urlparse
 	from bench.config.common_site_config import get_config
 	from bench.app import get_apps
 

install.py

@@ -1,5 +1,4 @@
 #!/usr/bin/env python3
-from __future__ import print_function
 import os
 import sys
 import subprocess

requirements.txt

@@ -6,5 +6,4 @@ python-crontab==2.4.0
 requests==2.22.0
 semantic-version==2.8.2
 setuptools
-six
 virtualenv

setup.py

@@ -11,6 +11,7 @@ setup(
 	author_email='info@frappe.io',
 	version=VERSION,
 	packages=find_packages(),
+	python_requires='~=3.6',
 	zip_safe=False,
 	include_package_data=True,
 	install_requires=install_requires,