python 3 compatibility

gassolar/environment/solar_irradiance.py

@@ -29,7 +29,7 @@ def get_Eirr(latitude, day, N=50.0):
              0.002697*cos(3*beta) + 0.00148*sin(3*beta))
     tstart = 12/np.pi*arccos(-tan(delta)*tan(lat))
     tend = -tstart
-    t = np.linspace(tstart, tend, N)
+    t = np.linspace(tstart, tend, int(N))
     costhsun = sin(delta)*sin(lat) + cos(delta)*cos(lat)*cos(2*np.pi*t/24)
 
     r0 = 149.597e6 # avg distance from earth to sun km
@@ -65,7 +65,7 @@ def twi_fits(latitude, day, gen=False):
     y = np.log(2*C[:-14])
     cn, err = fit(x, y, 1, "MA")
     rm = err
-    print "RMS error: %.4f" % rm
+    print("RMS error: %.4f" % rm)
     dftw = cn.get_fitdata()
     if not gen:
         fig1, ax1 = plt.subplots()
@@ -87,7 +87,7 @@ def twi_fits(latitude, day, gen=False):
     y = np.log(2*B[:-14])
     cn, err = fit(x, y, 1, "MA")
     rm = err
-    print "RMS error: %.4f" % rm
+    print("RMS error: %.4f" % rm)
     dfday = cn.get_fitdata()
     if not gen:
         yfit = cn.evaluate(x)
@@ -188,4 +188,3 @@ def twi_fits(latitude, day, gen=False):
         df.to_csv("solar_dayfit.csv")
     else:
         _, _ = twi_fits([30], 355, gen=True)
-

gassolar/environment/wind_speeds.py

@@ -53,7 +53,7 @@ def get_windspeed(latitude, perc, altitude, day, NS="NS", path=PATH):
     path += month + os.sep
 
     # pressure ranges for which there is data
-    pressures = [5, 10, 30] + range(50, 1050, 50)
+    pressures = [5, 10, 30] + list(range(50, 1050, 50))
     pressures = np.array(pressures)
     filename = None
 

runtests.sh

@@ -1 +1 @@
-python -c "from gpkit.tests.from_paths import run; run()"
+python -c "from gpkit.tests.from_paths import run; run(skipsolvers='look around')"