__format__ should fall back to str when spec='' (#63)

Author: NoureldinYosri

test/test_value.py

@@ -286,3 +286,6 @@ def test_format() -> None:
     x = 42.235 * tu.GHz
     assert f'{x:0.2f}' == '42.23 GHz'
     assert f'{x:0.1e}' == '4.2e+01 GHz'
+
+    assert f'{tu.GHz}' == 'GHz'
+    assert f'{2*tu.GHz}' == '2 GHz'

tunits/core/cython/with_unit.pyx

@@ -729,6 +729,7 @@ cdef class WithUnit:
         self.base_units.__setstate__(pickle_info['base_units'])
 
     def __format__(self, spec: str) -> str:
+        if spec == '' and self.value == 1: return str(self)
         return self.value.__format__(spec) + ' ' + str(self.unit)
 
 _try_interpret_as_with_unit = None