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-rwxr-xr-xcalctenna.py70
1 files changed, 45 insertions, 25 deletions
diff --git a/calctenna.py b/calctenna.py
index b782e5c..34cc2b8 100755
--- a/calctenna.py
+++ b/calctenna.py
@@ -6,23 +6,21 @@
# Oliver Meckmann
import argparse
+import unittest
+import sys
+
+class Tests(unittest.TestCase):
+ def test_calc(self):
+ self.assertEqual(calc(100e6, 0.951),
+ (2.99792458, 1.49896229, 0.749481145, 0.7127565688949999))
def run_argparse():
argparser = argparse.ArgumentParser()
- argparser.add_argument(
- '-f',
- '--frequency',
- required=True,
- metavar='frequency',
- help='desired frequency in Hz (e.g. 144800000 or 433e6, ...)',
- nargs='?',
- #default='100e6'
- )
+
argparser.add_argument(
'-V',
'--velocity-factor',
metavar='velocity_factor',
- nargs='?',
default='0.951'
)
argparser.add_argument(
@@ -31,47 +29,69 @@ def run_argparse():
help='print only result',
action='store_true'
)
+ argparser.add_argument(
+ 'frequency',
+ metavar='frequency',
+ help='desired frequency in Hz (e.g. 144800000 or 433e6, ...)',
+ nargs='?'
+ )
+ argparser.add_argument(
+ '-t',
+ '--tests',
+ help='run unit tests and exit',
+ action='store_true'
+ )
+
args = argparser.parse_args()
if not args.frequency:
argparser.print_usage()
- exit()
return args
-def calc(args):
- c = 299792458 # speed of light
-
+def check_input(frequency, velocity_factor):
try:
- f = float(args.frequency)
+ f = float(frequency)
except:
- print("Sorry, frequency input invalid")
- exit()
+ print("Sorry, frequency input invalid or missing")
+ return False
if f <= 0.0:
print("Sorry, frequency must be > 0")
- exit()
+ return False
try:
- V = float(args.velocity_factor)
+ V = float(velocity_factor)
except:
print("Sorry, velocity factor input invalid")
- exit()
+ return False
if V < 0.0 or V > 1.0:
print("Sorry, velocity factor can only be between 0.0 and 1.0")
- exit()
+ return False
- wavelength = float(c) / f
+ return True
+
+def calc(frequency, velocity_factor):
+ c = 299792458 # speed of light
+ wavelength = float(c) / float(frequency)
wavelength_2 = wavelength/2
wavelength_4 = wavelength/4
- dipole_leg_length = wavelength/4 * V
-
+ dipole_leg_length = wavelength/4 * float(velocity_factor)
return (wavelength, wavelength_2, wavelength_4, dipole_leg_length)
if __name__ == '__main__':
args = run_argparse()
- (wavelength, wavelength_2, wavelength_4, dipole_leg_length) = calc(args)
+
+ if args.tests:
+ # override args for unittest: argv[0] to have name in test output
+ unittest.main(argv=[sys.argv[0], '--verbose'], exit=True)
+
+ if not check_input(args.frequency, args.velocity_factor):
+ exit()
+
+ (wavelength, wavelength_2, wavelength_4, dipole_leg_length) = \
+ calc(args.frequency, args.velocity_factor)
if not args.quiet:
print("Desired Frequency: " + str(args.frequency) + " Hz")
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