def test_nans(self):
Q = float_pack(float('nan'), 8)
y = float_unpack(Q, 8)
assert repr(y) == 'nan'
L = float_pack(float('nan'), 4)
z = float_unpack(L, 4)
assert repr(z) == 'nan'
def check_float(self, x):
# check roundtrip
Q = float_pack(x, 8)
y = float_unpack(Q, 8)
assert repr(x) == repr(y)
# check that packing agrees with the struct module
struct_pack8 = struct.unpack('<Q', struct.pack('<d', x))[0]
float_pack8 = float_pack(x, 8)
assert struct_pack8 == float_pack8
# check that packing agrees with the struct module
try:
struct_pack4 = struct.unpack('<L', struct.pack('<f', x))[0]
except OverflowError:
struct_pack4 = "overflow"
try:
float_pack4 = float_pack(x, 4)
except OverflowError:
float_pack4 = "overflow"
assert struct_pack4 == float_pack4
# if we didn't overflow, try round-tripping the binary32 value
if float_pack4 != "overflow":
roundtrip = float_pack(float_unpack(float_pack4, 4), 4)
assert float_pack4 == roundtrip