do not convert string to float

a read method should not reply on the automatic conversion
of the return value from string to a number.

- transitional solution with generalConfig.lazy_numer_validation
+ changing slighly generalInit mechanism: for above feature
  generalConfig.init is not required to be called (i.e. when
  used on the client side)

Change-Id: Ibecce1a45669273c105932acdc0908de55bfd1b9
Reviewed-on: https://forge.frm2.tum.de/review/c/sine2020/secop/playground/+/27516
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>

test/test_datatypes.py

@@ -29,6 +29,7 @@ from secop.datatypes import ArrayOf, BLOBType, BoolType, \
     CommandType, ConfigError, DataType, Enum, EnumType, FloatRange, \
     IntRange, ProgrammingError, ScaledInteger, StatusType, \
     StringType, StructOf, TextType, TupleOf, get_datatype
+from secop.lib import generalConfig
 
 
 def copytest(dt):
@@ -36,6 +37,7 @@ def copytest(dt):
     assert dt.export_datatype() == dt.copy().export_datatype()
     assert dt != dt.copy()
 
+
 def test_DataType():
     dt = DataType()
     with pytest.raises(NotImplementedError):
@@ -116,7 +118,6 @@ def test_IntRange():
         dt('1.3')
     dt(1)
     dt(0)
-    dt('1')
     with pytest.raises(ProgrammingError):
         IntRange('xc', 'Yx')
 
@@ -132,6 +133,7 @@ def test_IntRange():
     with pytest.raises(ConfigError):
         dt.checkProperties()
 
+
 def test_ScaledInteger():
     dt = ScaledInteger(0.01, -3, 3)
     copytest(dt)
@@ -407,6 +409,7 @@ def test_ArrayOf():
     dt = ArrayOf(EnumType('myenum', single=0), 5)
     copytest(dt)
 
+
 def test_TupleOf():
     # test constructor catching illegal arguments
     with pytest.raises(ValueError):
@@ -641,6 +644,7 @@ def test_oneway_compatible(dt, contained_in):
     with pytest.raises(ValueError):
         contained_in.compatible(dt)
 
+
 @pytest.mark.parametrize('dt1, dt2', [
     (FloatRange(-5.5, 5.5), ScaledInteger(10, -5.5, 5.5)),
     (IntRange(0,1), BoolType()),
@@ -650,6 +654,7 @@ def test_twoway_compatible(dt1, dt2):
     dt1.compatible(dt1)
     dt2.compatible(dt2)
 
+
 @pytest.mark.parametrize('dt1, dt2', [
     (StringType(), FloatRange()),
     (IntRange(-10, 10), StringType()),
@@ -665,3 +670,12 @@ def test_incompatible(dt1, dt2):
         dt1.compatible(dt2)
     with pytest.raises(ValueError):
         dt2.compatible(dt1)
+
+
+@pytest.mark.parametrize('dt', [FloatRange(), IntRange(), ScaledInteger(1)])
+def test_lazy_validation(dt):
+    generalConfig.defaults['lazy_number_validation'] = True
+    dt('0')
+    generalConfig.defaults['lazy_number_validation'] = False
+    with pytest.raises(ValueError):
+        dt('0')