micropython/tests/feature_check/float.py

# detect how many bits of precision the floating point implementation has

try:
    float
except NameError:
    print(0)
else:
    if float('1.0000001') == float('1.0'):
        print(30)
    elif float('1e300') == float('inf'):
        print(32)
    else:
        print(64)