"预期类型'Union [str,bytearray]'得到'int'而不是写入方法中的警告

Question

我的脚本使用预先生成的数据模式按块写入文件块:

#  Data pattern generator    
def get_random_chunk_pattern():
            return ''.join(random.choice(ascii_uppercase + digits + ascii_lowercase) for _ in range(8))

....

# DedupChunk class CTOR:
class DedupChunk:
    def __init__(self, chunk_size, chunk_pattern, chunk_position=0, state=DedupChunkStates.PENDING):
        self._chunk_size = chunk_size  # chunk size in bytes
        self._chunk_pattern = chunk_pattern
        self._chunk_position = chunk_position
        self._state = state
        self.mapping = None

    @property
    def size(self):
        return self._chunk_size

    @property
    def pattern(self):
        return self._chunk_pattern

    @property
    def position(self):
        return self._chunk_position

    @property
    def state(self):
        return self._state

....

# Here Chunk object is being initialized (inside other class's CTOR):
chunk_size = random.randint(64, 192) * 1024  # in bytes
        while (position + chunk_size) < self.file_size:  # generating random chunks number
            self.chunks.append(DedupChunk(chunk_size, DedupChunkPattern.get_random_chunk_pattern(), position))

....

# Actual writing
    with open(self.path, 'rb+') as f:
        for chunk in self.chunks:
            f.write(chunk.pattern * (chunk.size // 8))

PyCharmExpected type 'Union[str, bytearray]' got 'int' instead在write方法中显示" "警告

但是当删除分区 f.write(chunk.pattern * chunk.size)或在外部进行分区时:

chunk.size //= 8
f.write(chunk.pattern * chunk.size)

警告消失了

这里到底发生了什么？

谢谢

Answer 1

忽略此警告.IDE正在最好地猜测(来自有限的信息)关于数据类型在运行时将是什么,但它猜错了.也就是说,如果你不知道实际上是什么东西,那么期望乘以一个int会产生的东西是合理的int.

如果您真的想要解决这个问题,那么chunk.pattern通过为您的类编写文档字符串(或使用注释提供类型提示)告诉IDE您期望的是什么.

例如.

class DedupChunk:
    """
    :type _chunk_pattern: str
    ... other fields
    """
    ... # rest of class

Answer 2

要忽略内联警告，请将此注释添加到导致警告的行上方

# noinspection PyTypeChecker