Open a Zstandard compressed file in binary or text mode. file can be either a file name (given as a str, bytes, or PathLike object), in which case the named file is opened, or it can be an existing file object to read from or write to. The mode parameter can be 'r', 'rb' (default), 'w', 'wb', 'x', 'xb', 'a', 'ab' for binary mode, or 'rt', 'wt', 'xt', 'at' for text mode. The level, options, and zstd_dict parameters specify the settings the same as ZstdFile. When using read mode (decompression), the options parameter is a dict representing advanced decompression options. The level parameter is not supported in this case. When using write mode (compression), only one of level, an int representing the compression level, or options, a dict representing advanced compression options, may be passed. In both modes, zstd_dict is a ZstdDict instance containing a trained Zstandard dictionary. For binary mode, this function is equivalent to the ZstdFile constructor: ZstdFile(filename, mode, ...). In this case, the encoding, errors and newline parameters must not be provided. For text mode, an ZstdFile object is created, and wrapped in an io.TextIOWrapper instance with the specified encoding, error handling behavior, and line ending(s).