--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/env/lib/python3.7/site-packages/isodate/isoduration.py	Sat May 02 07:14:21 2020 -0400
@@ -0,0 +1,151 @@
+##############################################################################
+# Copyright 2009, Gerhard Weis
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#  * Redistributions of source code must retain the above copyright notice,
+#    this list of conditions and the following disclaimer.
+#  * Redistributions in binary form must reproduce the above copyright notice,
+#    this list of conditions and the following disclaimer in the documentation
+#    and/or other materials provided with the distribution.
+#  * Neither the name of the authors nor the names of its contributors
+#    may be used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT
+##############################################################################
+'''
+This module provides an ISO 8601:2004 duration parser.
+
+It also provides a wrapper to strftime. This wrapper makes it easier to
+format timedelta or Duration instances as ISO conforming strings.
+'''
+from datetime import timedelta
+from decimal import Decimal
+import re
+
+from six import string_types
+
+from isodate.duration import Duration
+from isodate.isoerror import ISO8601Error
+from isodate.isodatetime import parse_datetime
+from isodate.isostrf import strftime, D_DEFAULT
+
+ISO8601_PERIOD_REGEX = re.compile(
+    r"^(?P<sign>[+-])?"
+    r"P(?!\b)"
+    r"(?P<years>[0-9]+([,.][0-9]+)?Y)?"
+    r"(?P<months>[0-9]+([,.][0-9]+)?M)?"
+    r"(?P<weeks>[0-9]+([,.][0-9]+)?W)?"
+    r"(?P<days>[0-9]+([,.][0-9]+)?D)?"
+    r"((?P<separator>T)(?P<hours>[0-9]+([,.][0-9]+)?H)?"
+    r"(?P<minutes>[0-9]+([,.][0-9]+)?M)?"
+    r"(?P<seconds>[0-9]+([,.][0-9]+)?S)?)?$")
+# regular expression to parse ISO duartion strings.
+
+
+def parse_duration(datestring):
+    """
+    Parses an ISO 8601 durations into datetime.timedelta or Duration objects.
+
+    If the ISO date string does not contain years or months, a timedelta
+    instance is returned, else a Duration instance is returned.
+
+    The following duration formats are supported:
+      -PnnW                  duration in weeks
+      -PnnYnnMnnDTnnHnnMnnS  complete duration specification
+      -PYYYYMMDDThhmmss      basic alternative complete date format
+      -PYYYY-MM-DDThh:mm:ss  extended alternative complete date format
+      -PYYYYDDDThhmmss       basic alternative ordinal date format
+      -PYYYY-DDDThh:mm:ss    extended alternative ordinal date format
+
+    The '-' is optional.
+
+    Limitations:  ISO standard defines some restrictions about where to use
+      fractional numbers and which component and format combinations are
+      allowed. This parser implementation ignores all those restrictions and
+      returns something when it is able to find all necessary components.
+      In detail:
+        it does not check, whether only the last component has fractions.
+        it allows weeks specified with all other combinations
+
+      The alternative format does not support durations with years, months or
+      days set to 0.
+    """
+    if not isinstance(datestring, string_types):
+        raise TypeError("Expecting a string %r" % datestring)
+    match = ISO8601_PERIOD_REGEX.match(datestring)
+    if not match:
+        # try alternative format:
+        if datestring.startswith("P"):
+            durdt = parse_datetime(datestring[1:])
+            if durdt.year != 0 or durdt.month != 0:
+                # create Duration
+                ret = Duration(days=durdt.day, seconds=durdt.second,
+                               microseconds=durdt.microsecond,
+                               minutes=durdt.minute, hours=durdt.hour,
+                               months=durdt.month, years=durdt.year)
+            else:  # FIXME: currently not possible in alternative format
+                # create timedelta
+                ret = timedelta(days=durdt.day, seconds=durdt.second,
+                                microseconds=durdt.microsecond,
+                                minutes=durdt.minute, hours=durdt.hour)
+            return ret
+        raise ISO8601Error("Unable to parse duration string %r" % datestring)
+    groups = match.groupdict()
+    for key, val in groups.items():
+        if key not in ('separator', 'sign'):
+            if val is None:
+                groups[key] = "0n"
+            # print groups[key]
+            if key in ('years', 'months'):
+                groups[key] = Decimal(groups[key][:-1].replace(',', '.'))
+            else:
+                # these values are passed into a timedelta object,
+                # which works with floats.
+                groups[key] = float(groups[key][:-1].replace(',', '.'))
+    if groups["years"] == 0 and groups["months"] == 0:
+        ret = timedelta(days=groups["days"], hours=groups["hours"],
+                        minutes=groups["minutes"], seconds=groups["seconds"],
+                        weeks=groups["weeks"])
+        if groups["sign"] == '-':
+            ret = timedelta(0) - ret
+    else:
+        ret = Duration(years=groups["years"], months=groups["months"],
+                       days=groups["days"], hours=groups["hours"],
+                       minutes=groups["minutes"], seconds=groups["seconds"],
+                       weeks=groups["weeks"])
+        if groups["sign"] == '-':
+            ret = Duration(0) - ret
+    return ret
+
+
+def duration_isoformat(tduration, format=D_DEFAULT):
+    '''
+    Format duration strings.
+
+    This method is just a wrapper around isodate.isostrf.strftime and uses
+    P%P (D_DEFAULT) as default format.
+    '''
+    # TODO: implement better decision for negative Durations.
+    #       should be done in Duration class in consistent way with timedelta.
+    if (((isinstance(tduration, Duration) and
+          (tduration.years < 0 or tduration.months < 0 or
+           tduration.tdelta < timedelta(0))) or
+        (isinstance(tduration, timedelta) and
+         (tduration < timedelta(0))))):
+        ret = '-'
+    else:
+        ret = ''
+    ret += strftime(tduration, format)
+    return ret