Used more augmented assignment statements.

Identified using the following command:

$ git grep -I '\(\<[_a-zA-Z0-9]\+\>\) *= *\1 *[-+/*^%&|<>@]'

5 files changed, 7 insertions, 7 deletions

diff --git a/django/utils/datetime_safe.py b/django/utils/datetime_safe.py
index 817ddcf0fa..2792b48a26 100644
--- a/django/utils/datetime_safe.py
+++ b/django/utils/datetime_safe.py
@@ -95,10 +95,10 @@ def strftime(dt, fmt):
     # 6 years to get into the 28-year repeat cycle
     delta = 2000 - year
     off = 6 * (delta // 100 + delta // 400)
-    year = year + off
+    year += off
 
     # Move to around the year 2000
-    year = year + ((2000 - year) // 28) * 28
+    year += ((2000 - year) // 28) * 28
     timetuple = dt.timetuple()
     s1 = time.strftime(fmt, (year,) + timetuple[1:])
     sites1 = _findall(s1, str(year))
diff --git a/django/utils/duration.py b/django/utils/duration.py
index 8495af3fa8..eae8527710 100644
--- a/django/utils/duration.py
+++ b/django/utils/duration.py
@@ -7,10 +7,10 @@ def _get_duration_components(duration):
     microseconds = duration.microseconds
 
     minutes = seconds // 60
-    seconds = seconds % 60
+    seconds %= 60
 
     hours = minutes // 60
-    minutes = minutes % 60
+    minutes %= 60
 
     return days, hours, minutes, seconds, microseconds
 
diff --git a/django/utils/numberformat.py b/django/utils/numberformat.py
index 6e3628ff91..a1ecd1bd0d 100644
--- a/django/utils/numberformat.py
+++ b/django/utils/numberformat.py
@@ -81,7 +81,7 @@ def format(
     else:
         int_part, dec_part = str_number, ""
     if decimal_pos is not None:
-        dec_part = dec_part + ("0" * (decimal_pos - len(dec_part)))
+        dec_part += "0" * (decimal_pos - len(dec_part))
     dec_part = dec_part and decimal_sep + dec_part
     # grouping
     if use_grouping:
diff --git a/django/utils/timezone.py b/django/utils/timezone.py
index 2107ec96ae..f3eac0e7b2 100644
--- a/django/utils/timezone.py
+++ b/django/utils/timezone.py
@@ -334,7 +334,7 @@ def _is_pytz_zone(tz):
     _PYTZ_BASE_CLASSES = (pytz.tzinfo.BaseTzInfo, pytz._FixedOffset)
     # In releases prior to 2018.4, pytz.UTC was not a subclass of BaseTzInfo
     if not isinstance(pytz.UTC, pytz._FixedOffset):
-        _PYTZ_BASE_CLASSES = _PYTZ_BASE_CLASSES + (type(pytz.UTC),)
+        _PYTZ_BASE_CLASSES += (type(pytz.UTC),)
 
     return isinstance(tz, _PYTZ_BASE_CLASSES)
 
diff --git a/django/utils/translation/__init__.py b/django/utils/translation/__init__.py
index 6b8cc73d5c..0b3f78e486 100644
--- a/django/utils/translation/__init__.py
+++ b/django/utils/translation/__init__.py
@@ -149,7 +149,7 @@ def lazy_number(func, resultclass, number=None, **kwargs):
                     number_value = rhs
                 translated = self._translate(number_value)
                 try:
-                    translated = translated % rhs
+                    translated %= rhs
                 except TypeError:
                     # String doesn't contain a placeholder for the number.
                     pass