exception ResourceWarning Base class for warnings related to resource usage.

exception ReferenceError This exception is raised when a weak reference proxy, created by the

exception UnicodeError Raised when a Unicode-related encoding or decoding error occurs. It is a subclass of ValueError

exception ValueError Raised when a built-in operation or function receives an argument that has the right type but an inappropriate

exception TimeoutError Raised when a system function timed out at the system level. Corresponds to errno ETIMEDOUT

exception UnicodeEncodeError Raised when a Unicode-related error occurs during encoding. It is a subclass of UnicodeError

exception SystemError Raised when the interpreter finds an internal error, but the situation does not look so serious to cause

exception WindowsError Only available on Windows.

exception ImportError Raised when an import statement fails to find the module definition or when a from

exception KeyError Raised when a mapping (dictionary) key is not found in the set of existing keys.