该模块提供动态类型检查机制。
typechecker的Python项目详细描述
该模块提供动态类型检查机制。
正常类型检查：
>>> from typechecker import typeinfo, list_, tuple_, has_attrs
>>> @typeinfo(int, x=int, y=int)
... def add(x, y):
... return x + y
>>> add(10, 20)
30
>>> add('aa', 'bb')
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "typechecker/typeinfo.py", line 113, in call
_check_arg(f, assigned, types)
File "typechecker/typeinfo.py", line 84, in _check_arg
f.__name__))
TypeError: In function add, argument "y" required "int". "str" found.
元组类型检查：
>>> @typeinfo(int, val=tuple_(int, str))
... def test(val):
... return len(val)
...
>>> test((19, 'aaa'))
2
>>> test('aaa')
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "typechecker/typeinfo.py", line 113, in call
_check_arg(f, assigned, types)
File "typechecker/typeinfo.py", line 84, in _check_arg
f.__name__))
TypeError: In function test, argument "val" required "tuple[int, str]". "str" found.
列表类型检查：
>>> @typeinfo(int, val=list_(int))
... def test(val):
... return 10
...
>>> test([1,2,3])
10
>>> test([1,2,'aaa'])
Traceback (most recent call last):
File "typechecker/typeinfo.py", line 113, in call
_check_arg(f, assigned, types)
File "typechecker/typeinfo.py", line 84, in _check_arg
f.__name__))
TypeError: In function test, argument "val" required "list[int]". "list" found.
复杂类型检查：
>>> @typeinfo(int, val=tuple_(list_(int))) ... def test(val): ... return 10 ... >>> test(([1],)) 10 >>> test((['aa'],)) Traceback (most recent call last): File "/usr/local/python2.7/lib/python2.7/doctest.py", line 1254, in __run compileflags, 1) in test.globs File "<doctest typechecker[12]>", line 1, in <module> test((['aa'],)) File "typechecker/typeinfo.py", line 113, in call _check_arg(f, assigned, types) File "typechecker/typeinfo.py", line 84, in _check_arg f.__name__)) TypeError: In function test, argument "val" required "tuple[list[int]]". "tuple" found.结构子类型：
>>> @typeinfo(int, f=Callable) ... def test(f): ... return 10 ... >>> test(map) 10 >>> test(1) Traceback (most recent call last): File "<console>", line 1, in <module> File "typechecker/typeinfo.py", line 113, in call _check_arg(f, assigned, types) File "typechecker/typeinfo.py", line 84, in _check_arg f.__name__)) TypeError: In function test, argument "f" required "hasattr[__call__]". "int" found.
然后检查：
>>> @typeinfo(int, f=and_(Callable, ContextManager))
... def test(f):
... return 10
...
>>> test(file)
10
>>> test(map)
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "typechecker/typeinfo.py", line 113, in call
_check_arg(f, assigned, types)
File "typechecker/typeinfo.py", line 84, in _check_arg
f.__name__))
TypeError: In function test, argument "f" required "And[hasattr[__call__], hasattr[__enter__, __exit__]]". "builtin_function_or_method" found.
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