remove Python2 crumbs, dependency on six

astroplan/constraints.py

@@ -4,9 +4,6 @@
 an observer.
 """
 
-from __future__ import (absolute_import, division, print_function,
-                        unicode_literals)
-
 # Standard library
 from abc import ABCMeta, abstractmethod
 import datetime

astroplan/exceptions.py

@@ -1,6 +1,4 @@
 # Licensed under a 3-clause BSD style license - see LICENSE.rst
-from __future__ import (absolute_import, division, print_function,
-                        unicode_literals)
 
 from astropy.utils.exceptions import AstropyWarning
 

astroplan/moon.py

@@ -3,9 +3,6 @@
 This version of the `moon` module calculates lunar phase angle for a geocentric
 """
 
-from __future__ import (absolute_import, division, print_function,
-                        unicode_literals)
-
 # Third-party
 import numpy as np
 from astropy.coordinates import get_sun, get_body

astroplan/observer.py

@@ -1,7 +1,4 @@
 # Licensed under a 3-clause BSD style license - see LICENSE.rst
-from __future__ import (absolute_import, division, print_function,
-                        unicode_literals)
-from six import string_types
 
 # Standard library
 import sys
@@ -216,7 +213,7 @@ def __init__(self, location=None, timezone='UTC', name=None, latitude=None,
         # Accept various timezone inputs, default to UTC
         if isinstance(timezone, datetime.tzinfo):
             self.timezone = timezone
-        elif isinstance(timezone, string_types):
+        elif isinstance(timezone, str):
             self.timezone = pytz.timezone(timezone)
         else:
             raise TypeError('timezone keyword should be a string, or an '

astroplan/periodic.py

@@ -1,6 +1,4 @@
 # Licensed under a 3-clause BSD style license - see LICENSE.rst
-from __future__ import (absolute_import, division, print_function,
-                        unicode_literals)
 import numpy as np
 import astropy.units as u
 from astropy.time import Time

astroplan/plots/finder.py

@@ -1,6 +1,4 @@
 # Licensed under a 3-clause BSD style license - see LICENSE.rst
-from __future__ import (absolute_import, division, print_function,
-                        unicode_literals)
 
 import numpy as np
 

astroplan/plots/mplstyles.py

@@ -1,7 +1,4 @@
 # Licensed under a 3-clause BSD style license - see LICENSE.rst
-from __future__ import (absolute_import, division, print_function,
-                        unicode_literals)
-
 import copy
 
 from astropy.visualization import astropy_mpl_style

astroplan/plots/tests/test_sky.py

@@ -1,6 +1,4 @@
 # Licensed under a 3-clause BSD style license - see LICENSE.rst
-from __future__ import (absolute_import, division, print_function,
-                        unicode_literals)
 import pytest
 
 try:

astroplan/plots/time_dependent.py

@@ -1,6 +1,4 @@
 # Licensed under a 3-clause BSD style license - see LICENSE.rst
-from __future__ import (absolute_import, division, print_function,
-                        unicode_literals)
 import copy
 import numpy as np
 import operator

astroplan/scheduling.py

@@ -3,9 +3,6 @@
 Tools for scheduling observations.
 """
 
-from __future__ import (absolute_import, division, print_function,
-                        unicode_literals)
-
 import copy
 from abc import ABCMeta, abstractmethod
 
@@ -24,7 +21,7 @@
            'Transitioner', 'Scorer']
 
 
-class ObservingBlock(object):
+class ObservingBlock:
     """
     An observation to be scheduled, consisting of a target and associated
     constraints on observations.
@@ -98,7 +95,7 @@ def from_exposures(cls, target, priority, time_per_exposure,
         return ob
 
 
-class Scorer(object):
+class Scorer:
     """
     Returns scores and score arrays from the evaluation of constraints on
     observing blocks
@@ -166,7 +163,7 @@ def from_start_end(cls, blocks, observer, start_time, end_time,
         return sc
 
 
-class TransitionBlock(object):
+class TransitionBlock:
     """
     Parameterizes the "dead time", e.g. between observations, while the
     telescope is slewing, instrument is reconfiguring, etc.
@@ -224,7 +221,7 @@ def from_duration(cls, duration):
         return tb
 
 
-class Schedule(object):
+class Schedule:
     """
     An object that represents a schedule, consisting of a list of
     `~astroplan.scheduling.Slot` objects.
@@ -423,7 +420,7 @@ def change_slot_block(self, slot_index, new_block=None):
             return slot_index - 1
 
 
-class Slot(object):
+class Slot:
     """
     A time slot consisting of a start and end time
     """
@@ -481,7 +478,7 @@ def split_slot(self, early_time, later_time):
             return [new_slot]
 
 
-class Scheduler(object):
+class Scheduler:
     """
     Schedule a set of `~astroplan.scheduling.ObservingBlock` objects
     """
@@ -948,7 +945,7 @@ def attempt_insert_block(self, b, new_start_time, start_time_idx):
         return True
 
 
-class Transitioner(object):
+class Transitioner:
     """
     A class that defines how to compute transition times from one block to
     another.

astroplan/target.py

@@ -1,6 +1,4 @@
 # Licensed under a 3-clause BSD style license - see LICENSE.rst
-from __future__ import (absolute_import, division, print_function,
-                        unicode_literals)
 
 # Standard library
 from abc import ABCMeta

astroplan/tests/test_constraints.py

@@ -1,5 +1,3 @@
-from __future__ import (absolute_import, division, print_function,
-                        unicode_literals)
 import datetime as dt
 
 import numpy as np

astroplan/tests/test_moon.py

@@ -1,7 +1,4 @@
 # Licensed under a 3-clause BSD style license - see LICENSE.rst
-from __future__ import (absolute_import, division, print_function,
-                        unicode_literals)
-
 from ..observer import Observer
 from astropy.time import Time
 from astropy.coordinates import EarthLocation

astroplan/tests/test_observer.py

@@ -1,6 +1,4 @@
 # Licensed under a 3-clause BSD style license - see LICENSE.rst
-from __future__ import (absolute_import, division, print_function,
-                        unicode_literals)
 
 # Standard library
 import datetime

astroplan/tests/test_periodic.py

@@ -1,6 +1,3 @@
-from __future__ import (absolute_import, division, print_function,
-                        unicode_literals)
-
 import numpy as np
 from astropy.time import Time
 import astropy.units as u

astroplan/tests/test_scheduling.py

@@ -1,6 +1,4 @@
 # Licensed under a 3-clause BSD style license - see LICENSE.rst
-from __future__ import (absolute_import, division, print_function,
-                        unicode_literals)
 
 import numpy as np
 from astropy.time import Time

astroplan/tests/test_target.py

@@ -1,6 +1,4 @@
 # Licensed under a 3-clause BSD style license - see LICENSE.rst
-from __future__ import (absolute_import, division, print_function,
-                        unicode_literals)
 
 import pytest
 

astroplan/tests/test_utils.py

@@ -1,7 +1,4 @@
 # Licensed under a 3-clause BSD style license - see LICENSE.rst
-from __future__ import (absolute_import, division, print_function,
-                        unicode_literals)
-
 import numpy as np
 import pytest
 

astroplan/utils.py

@@ -1,6 +1,4 @@
 # Licensed under a 3-clause BSD style license - see LICENSE.rst
-from __future__ import (absolute_import, division, print_function,
-                        unicode_literals)
 
 # Standard library
 import warnings

docs/conf.py

@@ -227,4 +227,4 @@
 #         continue
 #     dtype, target = line.split(None, 1)
 #     target = target.strip()
-#     nitpick_ignore.append((dtype, six.u(target)))
+#     nitpick_ignore.append((dtype, str(target)))

docs/faq/iers.rst

@@ -78,7 +78,7 @@ astropy's IERS machinery:
     import numpy as np
     import astropy.units as u
     from astropy.time import Time
-    from six.moves.urllib.error import HTTPError
+    from urllib.error import HTTPError
 
     # Download and cache the IERS Bulletins A and B  using astropy's machinery
     # (reminder: astroplan has its own function for this: `download_IERS_A`)

docs/installation.rst

@@ -10,7 +10,7 @@ Requirements
 ============
 
 **astroplan** works on Linux, Mac OS X and Windows.
-It requires Python 3.7+ as well as numpy, astropy, pytz, and six.
+It requires Python 3.7+ as well as numpy, astropy, and pytz.
 Additional features are available when you install `Matplotlib`_
 and `astroquery`_.
 

docs/tutorials/constraints.rst

@@ -259,9 +259,6 @@ satisfied.
 
 .. plot::
 
-    from __future__ import (absolute_import, division, print_function,
-                            unicode_literals)
-
     from astroplan import (FixedTarget, Observer, AltitudeConstraint,
                            AtNightConstraint, MoonSeparationConstraint)
     from astropy.time import Time

setup.cfg

@@ -20,7 +20,6 @@ install_requires =
     numpy>=1.17
     astropy>=4
     pytz
-    six
 
 [options.extras_require]
 all =