Fix datetime imports

doc/source/index.rst

@@ -114,10 +114,10 @@ Computing satellite position
 The orbital module enables computation of satellite position and velocity at a specific time:
 
     >>> from pyorbital.orbital import Orbital
-    >>> from datetime import datetime
+    >>> import datetime as dt
     >>> # Use current TLEs from the internet:
     >>> orb = Orbital("Suomi NPP")
-    >>> now = datetime.utcnow()
+    >>> now = dt.datetime.now(dt.timezone.utc)
     >>> # Get normalized position and velocity of the satellite:
     >>> orb.get_position(now)
     (array([-0.20015267,  0.09001458,  1.10686756]),
@@ -131,9 +131,9 @@ Use actual TLEs to increase accuracy
 ------------------------------------
 
     >>> from pyorbital.orbital import Orbital
-    >>> from datetime import datetime
+    >>> import datetime as dt
     >>> orb = Orbital("Suomi NPP")
-    >>> dtobj = datetime(2015,2,7,3,0)
+    >>> dtobj = dt.datetime(2015,2,7,3,0)
     >>> orb.get_lonlatalt(dtobj)
     (152.11564698762811, 20.475251739329622, 829.37355785502211)
 
@@ -158,8 +158,8 @@ Computing astronomical parameters
 The astronomy module enables computation of certain parameters of interest for satellite remote sensing for instance the Sun-zenith angle:
 
     >>> from pyorbital import astronomy
-    >>> from datetime import datetime
-    >>> utc_time = datetime(2012, 5, 15, 15, 45)
+    >>> import datetime as dt
+    >>> utc_time = dt.datetime(2012, 5, 15, 15, 45)
     >>> lon, lat = 12, 56
     >>> astronomy.sun_zenith_angle(utc_time, lon, lat)
     62.685986438071602

pyorbital/geoloc.py

@@ -274,8 +274,8 @@
     noaa18_tle1 = "1 28654U 05018A   11284.35271227  .00000478  00000-0  28778-3 0  9246"
     noaa18_tle2 = "2 28654  99.0096 235.8581 0014859 135.4286 224.8087 14.11526826329313"
 
-    from datetime import datetime
-    t = datetime(2011, 10, 12, 13, 45)
+    import datetime as dt
+    t = dt.datetime(2011, 10, 12, 13, 45)
 
     # edge and centre of an avhrr scanline
     # sgeom = ScanGeometry([(-0.9664123687741623, 0),

pyorbital/geoloc_example.py

@@ -22,7 +22,7 @@
 
 """Simple usage for geoloc."""
 
-from datetime import datetime
+import datetime as dt
 
 import matplotlib.pyplot as plt
 import numpy as np
@@ -35,7 +35,7 @@
 tle2 = "2 33591 098.8821 283.2036 0013384 242.4835 117.4960 14.11432063197875"
 
 # Choosing a specific time, this should be relatively close to the issue date of the TLE
-t = datetime(2012, 12, 12, 4, 16, 1, 575000)
+t = dt.datetime(2012, 12, 12, 4, 16, 1, 575000)
 # this is the number of full scan rotations
 scans_nb = 10
 # we take only every 40th point for plotting clarity

pyorbital/orbital.py

@@ -24,9 +24,9 @@
 
 """Module for computing the orbital parameters of satellites."""
 
+import datetime as dt
 import logging
 import warnings
-from datetime import datetime, timedelta, timezone
 from functools import partial
 
 import numpy as np
@@ -353,7 +353,7 @@
 
         """
         # every minute
-        times = utc_time + np.array([timedelta(minutes=minutes)
+        times = utc_time + np.array([dt.timedelta(minutes=minutes)
                                      for minutes in range(length * 60)])
         elev = self.get_observer_look(times, lon, lat, alt)[1] - horizon
         zcs = np.where(np.diff(np.sign(elev)))[0]
@@ -364,7 +364,7 @@
         elev_inv_func = partial(self._elevation_inv, utc_time, lon, lat, alt, horizon)
         for guess in zcs:
             horizon_mins = _get_root(elev_func, guess, guess + 1.0, tol=tol / 60.0)
-            horizon_time = utc_time + timedelta(minutes=horizon_mins)
+            horizon_time = utc_time + dt.timedelta(minutes=horizon_mins)
             if elev[guess] < 0:
                 risetime = horizon_time
                 risemins = horizon_mins
@@ -377,7 +377,7 @@
                 int_end = min(len(elev), int(np.ceil(fallmins) + 1))
                 middle = int_start + np.argmax(elev[int_start:int_end])
                 highest = utc_time + \
-                    timedelta(minutes=_get_max_parab(
+                    dt.timedelta(minutes=_get_max_parab(
                         elev_inv_func,
                         max(risemins, middle - 1), min(fallmins, middle + 1),
                         tol=tol / 60.0
@@ -401,14 +401,14 @@
         if "precision" in kwargs:
             precision = kwargs["precision"]
         else:
-            precision = timedelta(seconds=0.001)
+            precision = dt.timedelta(seconds=0.001)
         if "max_iterations" in kwargs:
             nmax_iter = kwargs["max_iterations"]
         else:
             nmax_iter = 100
 
         sec_step = 0.5
-        t_step = timedelta(seconds=sec_step / 2.0)
+        t_step = dt.timedelta(seconds=sec_step / 2.0)
 
         # Local derivative:
         def fprime(timex):
@@ -418,7 +418,7 @@
                                          obslon, obslat, 0.0)[1]
             return el0, (abs(el1) - abs(el0)) / sec_step
 
-        tx0 = utc_time - timedelta(seconds=1.0)
+        tx0 = utc_time - dt.timedelta(seconds=1.0)
         tx1 = utc_time
         idx = 0
         # eps = 500.
@@ -431,11 +431,11 @@
             # var_scale = np.abs(np.sin(fpr[0] * np.pi/180.))
             # var_scale = np.sqrt(var_scale)
             var_scale = np.abs(fpr[0])
-            tx1 = tx0 - timedelta(seconds=(eps * var_scale * fpr[1]))
+            tx1 = tx0 - dt.timedelta(seconds=(eps * var_scale * fpr[1]))
             idx = idx + 1
             # print idx, tx0, tx1, var_scale, fpr
             if abs(tx1 - utc_time) < precision and idx < 2:
-                tx1 = tx1 + timedelta(seconds=1.0)
+                tx1 = tx1 + dt.timedelta(seconds=1.0)
 
         if abs(tx1 - tx0) <= precision and idx < nmax_iter:
             return tx1
@@ -445,7 +445,7 @@
     def utc2local(self, utc_time):
         """Convert UTC to local time."""
         lon, _, _ = self.get_lonlatalt(utc_time)
-        return utc_time + timedelta(hours=lon * 24 / 360.0)
+        return utc_time + dt.timedelta(hours=lon * 24 / 360.0)
 
     def get_equatorial_crossing_time(self, tstart, tend, node="ascending", local_time=False,
                                      rtol=1E-9):
@@ -502,7 +502,7 @@
         except ValueError:
             # Bisection did not converge
             return None
-        tcross = np.datetime64(int(tcross), time_unit).astype(datetime)
+        tcross = np.datetime64(int(tcross), time_unit).astype(dt.datetime)
 
         # Convert UTC to local time
         if local_time:
@@ -514,7 +514,7 @@
     def _elevation(self, utc_time, lon, lat, alt, horizon, minutes):
         """Compute the elevation."""
         return self.get_observer_look(utc_time +
-                                      timedelta(minutes=np.float64(minutes)),
+                                      dt.timedelta(minutes=np.float64(minutes)),
                                       lon, lat, alt)[1] - horizon
 
 
@@ -1228,8 +1228,8 @@
     The input *utc_time* is either a timezone unaware object assumed to be in
     UTC, or a timezone aware datetime object in UTC.
     """
-    if isinstance(utc_time, datetime):
-        if utc_time.tzinfo and utc_time.tzinfo != timezone.utc:
+    if isinstance(utc_time, dt.datetime):
+        if utc_time.tzinfo and utc_time.tzinfo != dt.timezone.utc:
             raise ValueError("UTC time expected! Parsing a timezone aware datetime object requires it to be UTC!")
         return utc_time.replace(tzinfo=None)
 
@@ -1275,11 +1275,11 @@
     obs_alt = 0.02
     o = Orbital(satellite="METOP-B")
 
-    t_start = datetime.now()
-    t_stop = t_start + timedelta(minutes=20)
+    t_start = dt.datetime.now()
+    t_stop = t_start + dt.timedelta(minutes=20)
     t = t_start
     while t < t_stop:
-        t += timedelta(seconds=15)
+        t += dt.timedelta(seconds=15)
         lon, lat, alt = o.get_lonlatalt(t)
         lon, lat = np.rad2deg((lon, lat))
         az, el = o.get_observer_look(t, obs_lon, obs_lat, obs_alt)

pyorbital/tests/test_aiaa.py

@@ -26,9 +26,9 @@
 # TODO: right formal unit tests.
 from __future__ import print_function, with_statement
 
+import datetime as dt
 import os
 import unittest
-from datetime import datetime
 
 import numpy as np
 
@@ -63,7 +63,7 @@ def get_results(satnumber, delay):
                 if delay == 0:
                     utc_time = None
                 else:
-                    utc_time = datetime.strptime(sline[-1], "%H:%M:%S.%f")
+                    utc_time = dt.datetime.strptime(sline[-1], "%H:%M:%S.%f")
                     utc_time = utc_time.replace(year=int(sline[-4]),
                                                 month=int(sline[-3]),
                                                 day=int(sline[-2]))

pyorbital/tests/test_astronomy.py

@@ -23,7 +23,7 @@
 """Unit testing the Astronomy methods and functions."""
 
 
-from datetime import datetime
+import datetime as dt
 
 import dask.array as da
 import numpy as np
@@ -60,16 +60,16 @@ class TestAstronomy:
     """Testing the Astronomy class."""
 
     @pytest.mark.parametrize(
-        ("dt", "exp_jdays", "exp_j2000"),
+        ("dat", "exp_jdays", "exp_j2000"),
         [
-            (datetime(2000, 1, 1, 12, 0), 2451545.0, 0),
-            (datetime(2009, 10, 8, 14, 30), 2455113.1041666665, 3568.1041666666665),
+            (dt.datetime(2000, 1, 1, 12, 0), 2451545.0, 0),
+            (dt.datetime(2009, 10, 8, 14, 30), 2455113.1041666665, 3568.1041666666665),
         ]
     )
-    def test_jdays(self, dt, exp_jdays, exp_j2000):
+    def test_jdays(self, dat, exp_jdays, exp_j2000):
         """Test julian day functions."""
-        assert astr.jdays(dt) == exp_jdays
-        assert astr.jdays2000(dt) == exp_j2000
+        assert astr.jdays(dat) == exp_jdays
+        assert astr.jdays2000(dat) == exp_j2000
 
     @pytest.mark.parametrize(
         ("lon", "lat", "exp_theta"),
@@ -98,7 +98,7 @@ def test_sunangles(self, lon, lat, exp_theta, dtype, array_construct):
         if array_construct is None and dtype is not None:
             pytest.skip(reason="Xarray dependency unavailable")
 
-        time_slot = datetime(2011, 9, 23, 12, 0)
+        time_slot = dt.datetime(2011, 9, 23, 12, 0)
         abs_tolerance = 1e-8
         if dtype is not None:
             lon = array_construct([lon], dtype=dtype)
@@ -117,7 +117,7 @@ def test_sunangles(self, lon, lat, exp_theta, dtype, array_construct):
 
     def test_sun_earth_distance_correction(self):
         """Test the sun-earth distance correction."""
-        utc_time = datetime(2022, 6, 15, 12, 0, 0)
+        utc_time = dt.datetime(2022, 6, 15, 12, 0, 0)
         corr = astr.sun_earth_distance_correction(utc_time)
         corr_exp = 1.0156952156742332
         assert corr == pytest.approx(corr_exp, abs=1e-8)

pyorbital/tests/test_geoloc.py

@@ -23,7 +23,7 @@
 """Test the geoloc module."""
 
 
-from datetime import datetime
+import datetime as dt
 
 import numpy as np
 
@@ -108,7 +108,7 @@ def test_scan_geometry(self):
 
         # Test times
 
-        start_of_scan = np.datetime64(datetime(2014, 1, 8, 11, 30))
+        start_of_scan = np.datetime64(dt.datetime(2014, 1, 8, 11, 30))
         times = instrument.times(start_of_scan)
 
         assert times[0, 1] == start_of_scan