diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 5320a9e7..518e990f 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -11,17 +11,17 @@ repos:
       - id: black
         args: ["--target-version", "py36"]
 
+  - repo: https://github.com/PyCQA/isort
+    rev: 5.6.4
+    hooks:
+      - id: isort
+
   - repo: https://gitlab.com/pycqa/flake8
     rev: 3.8.4
     hooks:
       - id: flake8
         additional_dependencies: [flake8-2020, flake8-implicit-str-concat]
 
-  - repo: https://github.com/timothycrosley/isort
-    rev: 5.6.4
-    hooks:
-      - id: isort
-
   - repo: https://github.com/pre-commit/pygrep-hooks
     rev: v1.7.0
     hooks:
@@ -33,6 +33,7 @@ repos:
       - id: check-merge-conflict
       - id: check-toml
       - id: check-yaml
+      - id: end-of-file-fixer
 
   - repo: https://github.com/PyCQA/pydocstyle
     rev: 5.1.1
@@ -41,6 +42,11 @@ repos:
         args: ["--convention", "google"]
         files: "src/"
 
+  - repo: https://github.com/tox-dev/tox-ini-fmt
+    rev: 0.5.0
+    hooks:
+      - id: tox-ini-fmt
+
   - repo: https://github.com/asottile/setup-cfg-fmt
     rev: v1.15.1
     hooks:
diff --git a/setup.cfg b/setup.cfg
index bc71a943..e0335c44 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -56,12 +56,7 @@ max_line_length = 88
 convention = google
 
 [tool:isort]
-known_third_party = freezegun,humanize,pkg_resources,pytest,setuptools
-force_grid_wrap = 0
-include_trailing_comma = True
-line_length = 88
-multi_line_output = 3
-use_parentheses = True
+profile = black
 
 [tool:pytest]
 addopts = --color=yes
diff --git a/src/humanize/__init__.py b/src/humanize/__init__.py
index 44d7c1d7..96b26558 100644
--- a/src/humanize/__init__.py
+++ b/src/humanize/__init__.py
@@ -1,7 +1,8 @@
 """Main package for humanize."""
 import pkg_resources
+
 from humanize.filesize import naturalsize
-from humanize.i18n import activate, deactivate
+from humanize.i18n import activate, deactivate, thousands_separator
 from humanize.number import apnumber, fractional, intcomma, intword, ordinal, scientific
 from humanize.time import (
     naturaldate,
@@ -30,5 +31,6 @@
     "ordinal",
     "precisedelta",
     "scientific",
+    "thousands_separator",
     "VERSION",
 ]
diff --git a/src/humanize/i18n.py b/src/humanize/i18n.py
index 95e7be94..d2625b67 100644
--- a/src/humanize/i18n.py
+++ b/src/humanize/i18n.py
@@ -3,12 +3,18 @@
 import os.path
 from threading import local
 
-__all__ = ["activate", "deactivate", "gettext", "ngettext"]
+__all__ = ["activate", "deactivate", "gettext", "ngettext", "thousands_separator"]
 
 _TRANSLATIONS = {None: gettext_module.NullTranslations()}
 _CURRENT = local()
 
 
+# Mapping of locale to thousands separator
+_THOUSANDS_SEPARATOR = {
+    "fr_FR": " ",
+}
+
+
 def _get_default_locale_path():
     try:
         if __file__ is None:
@@ -129,3 +135,16 @@ def num_name(n):
         str: Original text, unchanged.
     """
     return message
+
+
+def thousands_separator() -> str:
+    """Return the thousands separator for a locale, default to comma.
+
+    Returns:
+         str: Thousands separator.
+    """
+    try:
+        sep = _THOUSANDS_SEPARATOR[_CURRENT.locale]
+    except (AttributeError, KeyError):
+        sep = ","
+    return sep
diff --git a/src/humanize/number.py b/src/humanize/number.py
index 0fef81f1..f4253951 100644
--- a/src/humanize/number.py
+++ b/src/humanize/number.py
@@ -8,6 +8,7 @@
 from .i18n import gettext as _
 from .i18n import gettext_noop as N_
 from .i18n import pgettext as P_
+from .i18n import thousands_separator
 
 
 def ordinal(value):
@@ -97,9 +98,10 @@ def intcomma(value, ndigits=None):
     Returns:
         str: string containing commas every three digits.
     """
+    sep = thousands_separator()
     try:
         if isinstance(value, str):
-            float(value.replace(",", ""))
+            float(value.replace(sep, ""))
         else:
             float(value)
     except (TypeError, ValueError):
@@ -110,7 +112,7 @@ def intcomma(value, ndigits=None):
     else:
         orig = str(value)
 
-    new = re.sub(r"^(-?\d+)(\d{3})", r"\g<1>,\g<2>", orig)
+    new = re.sub(r"^(-?\d+)(\d{3})", fr"\g<1>{sep}\g<2>", orig)
     if orig == new:
         return new
     else:
diff --git a/tests/test_filesize.py b/tests/test_filesize.py
index 871c61a8..a629b930 100644
--- a/tests/test_filesize.py
+++ b/tests/test_filesize.py
@@ -2,9 +2,10 @@
 
 """Tests for filesize humanizing."""
 
-import humanize
 import pytest
 
+import humanize
+
 
 @pytest.mark.parametrize(
     "test_args, expected",
diff --git a/tests/test_i18n.py b/tests/test_i18n.py
index 385be253..d778583d 100644
--- a/tests/test_i18n.py
+++ b/tests/test_i18n.py
@@ -1,9 +1,10 @@
 import datetime as dt
 import importlib
 
-import humanize
 import pytest
 
+import humanize
+
 
 def test_i18n():
     three_seconds = dt.timedelta(seconds=3)
@@ -26,6 +27,20 @@ def test_i18n():
         assert humanize.precisedelta(one_min_three_seconds) == "1 minute and 7 seconds"
 
 
+def test_intcomma():
+    number = 10_000_000
+
+    assert humanize.intcomma(number) == "10,000,000"
+
+    try:
+        humanize.i18n.activate("fr_FR")
+        assert humanize.intcomma(number) == "10 000 000"
+
+    finally:
+        humanize.i18n.deactivate()
+        assert humanize.intcomma(number) == "10,000,000"
+
+
 def test_default_locale_path_defined__file__():
     i18n = importlib.import_module("humanize.i18n")
     assert i18n._get_default_locale_path() is not None
diff --git a/tests/test_number.py b/tests/test_number.py
index 347217d2..25f1d729 100644
--- a/tests/test_number.py
+++ b/tests/test_number.py
@@ -2,8 +2,9 @@
 
 """Number tests."""
 
-import humanize
 import pytest
+
+import humanize
 from humanize import number
 
 
diff --git a/tests/test_time.py b/tests/test_time.py
index f0311ce9..19e0ce6c 100644
--- a/tests/test_time.py
+++ b/tests/test_time.py
@@ -4,9 +4,10 @@
 
 import datetime as dt
 
-import humanize
 import pytest
 from freezegun import freeze_time
+
+import humanize
 from humanize import time
 
 ONE_DAY_DELTA = dt.timedelta(days=1)
diff --git a/tox.ini b/tox.ini
index 294b122f..b961099a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 envlist =
-    py{36, 37, 38, 39, py3}
+    py{py3, 39, 38, 37, 36}
 
 [testenv]
 extras =
@@ -9,14 +9,19 @@ commands =
     {envpython} -m pytest --cov humanize --cov tests --cov-report xml {posargs}
 
 [testenv:docs]
-deps = -r docs/requirements.txt
-commands = mkdocs build
+deps =
+    -rdocs/requirements.txt
+commands =
+    mkdocs build
 
 [testenv:lint]
-deps = pre-commit
-commands = pre-commit run --all-files --show-diff-on-failure
+passenv =
+    PRE_COMMIT_COLOR
 skip_install = true
-passenv = PRE_COMMIT_COLOR
+deps =
+    pre-commit
+commands =
+    pre-commit run --all-files --show-diff-on-failure
 
 [pytest]
-addopts = --doctest-modules
\ No newline at end of file
+addopts = --doctest-modules