diff options
Diffstat (limited to 'python-packages/order_utils/src/zero_ex/dev_utils/type_assertions.py')
-rw-r--r-- | python-packages/order_utils/src/zero_ex/dev_utils/type_assertions.py | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/python-packages/order_utils/src/zero_ex/dev_utils/type_assertions.py b/python-packages/order_utils/src/zero_ex/dev_utils/type_assertions.py index 745d014e6..08c1b0ea5 100644 --- a/python-packages/order_utils/src/zero_ex/dev_utils/type_assertions.py +++ b/python-packages/order_utils/src/zero_ex/dev_utils/type_assertions.py @@ -31,3 +31,28 @@ def assert_is_list(value: Any, name: str) -> None: f"expected variable '{name}', with value {str(value)}, to have" + f" type 'list', not '{type(value).__name__}'" ) + + +def assert_is_int(value: Any, name: str) -> None: + """If :param value: isn't of type int, raise a TypeError. + + >>> try: assert_is_int('asdf', 'var') + ... except TypeError as type_error: print(str(type_error)) + ... + expected variable 'var', with value asdf, to have type 'int', not 'str' + """ + if not isinstance(value, int): + raise TypeError( + f"expected variable '{name}', with value {str(value)}, to have" + + f" type 'int', not '{type(value).__name__}'" + ) + + +def assert_is_hex_string(value: Any, name: str) -> None: + """Assert that :param value: is a string of hex chars. + + If :param value: isn't a str, raise a TypeError. If it is a string but + contains non-hex characters ("0x" prefix permitted), raise a ValueError. + """ + assert_is_string(value, name) + int(value, 16) # raises a ValueError if value isn't a base-16 str |