Bump min Python version from 3.6.2 to 3.7.2

.travis.yml

@@ -1,15 +1,14 @@
 # Config file for automatic testing at travis-ci.com
 
 language: python
-dist: bionic
+dist: focal
 
 matrix:
    include:
-      - python: "3.6"
       - python: "3.7"
       - python: "3.8"
       - python: "3.9"
-      - python: "pypy3"  # Python 3.6.12-7.3.3 as of April 2021
+      # - python: "pypy3"  travis doesn't support pypy on Python 3.7 yet
       - python: "3.9"
         env: IPFS_VERSION=compat
       - python: "3.9"
@@ -20,14 +19,14 @@ matrix:
       - python: "3.9"
         env: TOXENV=typeck
         before_install: ":"
-     
+
       # Testing on macOS/Darwin tends to be much slower so only test the bare minimum
       #
       # When changing any version here also update the relevant checksum below with
       # the values found on the https://python.org/ website.
       - os: osx
         language: shell
-        env: PYTHON_VERSION=3.6.8-macosx10.9
+        env: PYTHON_VERSION=3.7.9-macosx10.9
       - os: osx
         language: shell
         env: PYTHON_VERSION=3.9.0-macosx10.9
@@ -110,7 +109,7 @@ install:
       
       ### ====== MODIFY THIS WHEN CHANGING MACOS PYTHON TEST VERSIONS ====== ###
       case "${PYTHON_VERSION}" in
-         3.6.8-macosx10.9) MD5_MACOS="786c4d9183c754f58751d52f509bc971" ;;
+         3.7.9-macosx10.9) MD5_MACOS="4b544fc0ac8c3cffdb67dede23ddb79e" ;;
          3.9.0-macosx10.9) MD5_MACOS="16ca86fa3467e75bade26b8a9703c27f" ;;
       esac
       ### ------------------------------ END ------------------------------- ###

ipfshttpclient/filescanner.py

@@ -20,14 +20,10 @@
 
 AnyStr = ty.TypeVar('AnyStr', bytes, str)
 
-if sys.version_info >= (3, 7):  #PY37+
-	re_pattern_type = re.Pattern
-	if ty.TYPE_CHECKING:
-		re_pattern_t = re.Pattern[AnyStr]
-	else:
-		re_pattern_t = re.Pattern
-else:  #PY36-
-	re_pattern_t = re_pattern_type = type(re.compile(""))
+if ty.TYPE_CHECKING:
+	re_pattern_t = re.Pattern[AnyStr]
+else:
+	re_pattern_t = re.Pattern
 
 # Windows does not have os.O_DIRECTORY
 O_DIRECTORY: int = getattr(os, "O_DIRECTORY", 0)
@@ -476,7 +472,7 @@ def _matcher_from_spec(spec: match_spec_t[AnyStr], *,
 
 def _recursive_matcher_from_spec(spec: match_spec_t[AnyStr], *,
                                  period_special: bool = True) -> Matcher[AnyStr]:
-	if isinstance(spec, re_pattern_type):
+	if isinstance(spec, re.Pattern):
 		return ReMatcher(spec)
 	elif isinstance(spec, (str, bytes)):
 		return GlobMatcher(spec, period_special=period_special)
@@ -577,8 +573,6 @@ def __init__(
 			os.stat(directory_str)
 
 			# … and possibly open it as a FD if this is supported by the platform
-			#
-			# Note: `os.fwalk` support for binary paths was only added in 3.7+.
 			directory_str_or_fd: ty.Union[AnyStr, int] = directory_str
 			if HAVE_FWALK and (not isinstance(directory_str, bytes) or HAVE_FWALK_BYTES):
 				fd = os.open(directory_str, os.O_RDONLY | O_DIRECTORY)

pyproject.toml

@@ -15,12 +15,10 @@ description-file = "README.md"
 # Notes: `typing.NoReturn` was introduced post-release in Python 3.5.4 and 3.6.2 and had
 #        a critical bug (https://bugs.python.org/issue34921) in 3.7.0 to 3.7.1. So the
 #        compatible versions below reflect the range of Python versions with working
-#        `typing.NoReturn` function signature support. (Also, many other `typing` module
-#        items were only introduced post-release in 3.6 and version restrictions on these
-#	     versions ensure that those are all available as well.)
+#        `typing.NoReturn` function signature support.
 #
 #        Maintain this concurrently with verify.sh
-requires-python = ">=3.6.2,!=3.7.0,!=3.7.1"
+requires-python = ">=3.7.2"
 requires = [
 	"multiaddr (>=0.0.7)",
 	"requests (>=2.11)"
@@ -45,7 +43,6 @@ classifiers = [
 	# Specify the Python versions you support here. In particular, ensure
 	# that you indicate whether you support Python 2, Python 3 or both.
 	"Programming Language :: Python :: 3 :: Only",
-	"Programming Language :: Python :: 3.6",
 	"Programming Language :: Python :: 3.7",
 	"Programming Language :: Python :: 3.8",
 	"Programming Language :: Python :: 3.9",

verify.sh

@@ -10,7 +10,6 @@ if [ -z "$1" ]; then
     echo "Validating minimum point release of each supported minor version..."
 
     # Maintain this concurrently with [tool.flit.metadata].requires-python in pyproject.toml.
-    validate 3.6.2
     validate 3.7.2
     validate 3.8.0
     validate 3.9.0