deprecate units T, t, L, l and fix tests

Author: natmokval

pandas/_libs/tslibs/dtypes.pyx

@@ -379,10 +379,14 @@ cpdef NPY_DATETIMEUNIT abbrev_to_npy_unit(str abbrev):
         return NPY_DATETIMEUNIT.NPY_FR_h
     elif abbrev == "m":
         return NPY_DATETIMEUNIT.NPY_FR_m
+    elif abbrev == "T"  or abbrev == "t":
+        return NPY_DATETIMEUNIT.NPY_FR_m
     elif abbrev == "s":
         return NPY_DATETIMEUNIT.NPY_FR_s
     elif abbrev == "ms":
         return NPY_DATETIMEUNIT.NPY_FR_ms
+    elif abbrev == "L"  or abbrev == "l":
+        return NPY_DATETIMEUNIT.NPY_FR_ms
     elif abbrev == "us":
         return NPY_DATETIMEUNIT.NPY_FR_us
     elif abbrev == "ns":

pandas/_libs/tslibs/timedeltas.pyi

@@ -49,6 +49,7 @@ UnitChoices = Literal[
     "milli",
     "millis",
     "l",
+    "L",
     "us",
     "microseconds",
     "microsecond",

pandas/_libs/tslibs/timedeltas.pyx

@@ -722,7 +722,7 @@ cpdef inline str parse_timedelta_unit(str unit):
     """
     if unit is None:
         return "ns"
-    elif unit == "M":
+    elif unit in {"M", "t", "T", "l", "L"}:
         return unit
     try:
         return timedelta_abbrevs[unit.lower()]

pandas/core/tools/timedeltas.py

@@ -110,9 +110,9 @@ def to_timedelta(
         * 'W'
         * 'D' / 'days' / 'day'
         * 'hours' / 'hour' / 'hr' / 'h'
-        * 'm' / 'minute' / 'min' / 'minutes' / 'T'
+        * 'm' / 'minute' / 'min' / 'minutes'
         * 'S' / 'seconds' / 'sec' / 'second'
-        * 'ms' / 'milliseconds' / 'millisecond' / 'milli' / 'millis' / 'L'
+        * 'ms' / 'milliseconds' / 'millisecond' / 'milli' / 'millis'
         * 'us' / 'microseconds' / 'microsecond' / 'micro' / 'micros' / 'U'
         * 'ns' / 'nanoseconds' / 'nano' / 'nanos' / 'nanosecond' / 'N'
 
@@ -181,6 +181,9 @@ def to_timedelta(
             "represent unambiguous timedelta values durations."
         )
 
+    if unit in {"t", "T", "l", "L"}:
+        raise ValueError("Units 't', 'T', 'l' and 'L' are no longer supported.")
+
     if arg is None:
         return arg
     elif isinstance(arg, ABCSeries):

pandas/tests/indexes/timedeltas/test_timedelta_range.py

@@ -38,8 +38,8 @@ def test_timedelta_range(self):
         result = timedelta_range("1 days, 00:00:02", periods=5, freq="2D")
         tm.assert_index_equal(result, expected)
 
-        expected = to_timedelta(np.arange(50), unit="T") * 30
-        result = timedelta_range("0 days", freq="30T", periods=50)
+        expected = to_timedelta(np.arange(50), unit="min") * 30
+        result = timedelta_range("0 days", freq="30min", periods=50)
         tm.assert_index_equal(result, expected)
 
     @pytest.mark.parametrize(

pandas/tests/resample/test_timedelta.py

@@ -48,17 +48,17 @@ def test_resample_as_freq_with_subperiod():
 def test_resample_with_timedeltas():
     expected = DataFrame({"A": np.arange(1480)})
     expected = expected.groupby(expected.index // 30).sum()
-    expected.index = timedelta_range("0 days", freq="30T", periods=50)
+    expected.index = timedelta_range("0 days", freq="30min", periods=50)
 
     df = DataFrame(
-        {"A": np.arange(1480)}, index=pd.to_timedelta(np.arange(1480), unit="T")
+        {"A": np.arange(1480)}, index=pd.to_timedelta(np.arange(1480), unit="min")
     )
-    result = df.resample("30T").sum()
+    result = df.resample("30min").sum()
 
     tm.assert_frame_equal(result, expected)
 
     s = df["A"]
-    result = s.resample("30T").sum()
+    result = s.resample("30min").sum()
     tm.assert_series_equal(result, expected["A"])
 
 

pandas/tests/scalar/timedelta/test_timedelta.py

@@ -492,11 +492,9 @@ def test_nat_converters(self):
                 "minute",
                 "min",
                 "minutes",
-                "t",
                 "Minute",
                 "Min",
                 "Minutes",
-                "T",
             ]
         ]
         + [
@@ -520,13 +518,11 @@ def test_nat_converters(self):
                 "millisecond",
                 "milli",
                 "millis",
-                "l",
                 "MS",
                 "Milliseconds",
                 "Millisecond",
                 "Milli",
                 "Millis",
-                "L",
             ]
         ]
         + [