Created
October 25, 2012 21:18
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Python type checker
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import types | |
classobj = types.ClassType | |
def check_base_type(arg, nested=False): | |
msgs = [] | |
if isinstance(arg, tuple) and not nested: | |
[check_base_type(a, True) for a in arg] | |
try: | |
assert type(arg) == type or type(arg) == classobj | |
except AssertionError: | |
msgs.append('{arg} is not basetype, but `{actual_type}`'.format(arg=arg, actual_type=type(arg).__name__)) | |
if msgs: | |
print ' '.join(msgs) | |
raise AssertionError | |
def mydeco(fn, *args, **kwargs): | |
def wrapper(*args2, **kwargs2): | |
return_type = kwargs.pop('return_type', None) | |
map(check_base_type, args) | |
msgs = [] | |
if len(args) != len(args2): | |
print 'Length of types: {}, length of args: {}' | |
return | |
for i, arg in enumerate(args): | |
try: | |
assert isinstance(args2[i], args[i]) | |
except AssertionError: | |
msgs.append('{arg} is not instance of `{expected_type}`, but `{actual_type}`'.format(arg=args2[i], expected_type=args[i].__name__, actual_type=type(args2[i]).__name__)) | |
for key in kwargs2: | |
try: | |
assert isinstance(kwargs2[key], kwargs[key]) | |
except AssertionError: | |
msgs.append('{arg} is not instance of `{expected_type}`, but `{actual_type}`'.format(arg=kwargs2[key], expected_type=kwargs[key].__name__, actual_type=type(kwargs2[key].__name__))) | |
if not msgs: | |
if not return_type: | |
return fn(*args2, **kwargs) | |
ret_val = fn(*args2, **kwargs) | |
try: | |
assert isinstance(ret_val, return_type) | |
except AssertionError: | |
msgs.append('{arg} is not instance of `{expected_type}`, but `{actual_type}`'.format(arg=ret_val, expected_type=return_type.__name__, actual_type=type(ret_val).__name__)) | |
print ' '.join(msgs) | |
return wrapper |
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