我有这个方法存根：
'list' object has no attribute 'equals'如何创建无反射的trd_exctn_dt trd_exctn_tm contra_party_type ascii_rptd_vol_tx rptd_pr yld_pt side sttl_dt msg_seq_nb
0 2018-07-02 9:35:21 D 250000.0 98.623000 4.475237 S 7/5/2018 4418
1 2018-07-02 9:39:08 D 150000.0 98.610000 4.476914 S 7/5/2018 4747
`---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
~\Anaconda3\lib\site-packages\IPython\core\formatters.py in __call__(self, obj)
700 type_pprinters=self.type_printers,
701 deferred_pprinters=self.deferred_printers)
--> 702 printer.pretty(obj)
703 printer.flush()
704 return stream.getvalue()
~\Anaconda3\lib\site-packages\IPython\lib\pretty.py in pretty(self, obj)
398 if cls is not object \
399 and callable(cls.__dict__.get('__repr__')):
--> 400 return _repr_pprint(obj, self, cycle)
401
402 return _default_pprint(obj, self, cycle)
~\Anaconda3\lib\site-packages\IPython\lib\pretty.py in _repr_pprint(obj, p, cycle)
693 """A pprint that just redirects to the normal repr function."""
694 # Find newlines and replace them with p.break_()
--> 695 output = repr(obj)
696 for idx,output_line in enumerate(output.splitlines()):
697 if idx:
~\Anaconda3\lib\site-packages\pandas\core\base.py in __repr__(self)
80 Yields Bytestring in Py2, Unicode String in py3.
81 """
---> 82 return str(self)
83
84
~\Anaconda3\lib\site-packages\pandas\core\base.py in __str__(self)
59
60 if compat.PY3:
---> 61 return self.__unicode__()
62 return self.__bytes__()
63
~\Anaconda3\lib\site-packages\pandas\core\frame.py in __unicode__(self)
661 width = None
662 self.to_string(buf=buf, max_rows=max_rows, max_cols=max_cols,
--> 663 line_width=width, show_dimensions=show_dimensions)
664
665 return buf.getvalue()
~\Anaconda3\lib\site-packages\pandas\core\frame.py in to_string(self, buf, columns, col_space, header, index, na_rep, formatters, float_format, sparsify, index_names, justify, line_width, max_rows, max_cols, show_dimensions)
1965 max_rows=max_rows,
1966 max_cols=max_cols,
-> 1967 show_dimensions=show_dimensions)
1968 formatter.to_string()
1969
~\Anaconda3\lib\site-packages\pandas\io\formats\format.py in __init__(self, frame, buf, columns, col_space, header, index, na_rep, formatters, justify, float_format, sparsify, index_names, line_width, max_rows, max_cols, show_dimensions, decimal, table_id, **kwds)
430 self.columns = frame.columns
431
--> 432 self._chk_truncate()
433 self.adj = _get_adjustment()
434
~\Anaconda3\lib\site-packages\pandas\io\formats\format.py in _chk_truncate(self)
502 row_num = max_rows_adj // 2
503 frame = concat((frame.iloc[:row_num, :],
--> 504 frame.iloc[-row_num:, :]))
505 self.tr_row_num = row_num
506
~\Anaconda3\lib\site-packages\pandas\core\reshape\concat.py in concat(objs, axis, join, join_axes, ignore_index, keys, levels, names, verify_integrity, sort, copy)
224 verify_integrity=verify_integrity,
225 copy=copy, sort=sort)
--> 226 return op.get_result()
227
228
~\Anaconda3\lib\site-packages\pandas\core\reshape\concat.py in get_result(self)
414
415 obj_labels = mgr.axes[ax]
--> 416 if not new_labels.equals(obj_labels):
417 indexers[ax] = obj_labels.reindex(new_labels)[1]
418
AttributeError: 'list' object has no attribute 'equals'
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
~\Anaconda3\lib\site-packages\IPython\core\formatters.py in __call__(self, obj)
343 method = get_real_method(obj, self.print_method)
344 if method is not None:
--> 345 return method()
346 return None
347 else:
~\Anaconda3\lib\site-packages\pandas\core\frame.py in _repr_html_(self)
694
695 return self.to_html(max_rows=max_rows, max_cols=max_cols,
--> 696 show_dimensions=show_dimensions, notebook=True)
697 else:
698 return None
~\Anaconda3\lib\site-packages\pandas\core\frame.py in to_html(self, buf, columns, col_space, header, index, na_rep, formatters, float_format, sparsify, index_names, justify, bold_rows, classes, escape, max_rows, max_cols, show_dimensions, notebook, decimal, border, table_id)
2030 max_cols=max_cols,
2031 show_dimensions=show_dimensions,
-> 2032 decimal=decimal, table_id=table_id)
2033 # TODO: a generic formatter wld b in DataFrameFormatter
2034 formatter.to_html(classes=classes, notebook=notebook, border=border)
~\Anaconda3\lib\site-packages\pandas\io\formats\format.py in __init__(self, frame, buf, columns, col_space, header, index, na_rep, formatters, justify, float_format, sparsify, index_names, line_width, max_rows, max_cols, show_dimensions, decimal, table_id, **kwds)
430 self.columns = frame.columns
431
--> 432 self._chk_truncate()
433 self.adj = _get_adjustment()
434
~\Anaconda3\lib\site-packages\pandas\io\formats\format.py in _chk_truncate(self)
502 row_num = max_rows_adj // 2
503 frame = concat((frame.iloc[:row_num, :],
--> 504 frame.iloc[-row_num:, :]))
505 self.tr_row_num = row_num
506
~\Anaconda3\lib\site-packages\pandas\core\reshape\concat.py in concat(objs, axis, join, join_axes, ignore_index, keys, levels, names, verify_integrity, sort, copy)
224 verify_integrity=verify_integrity,
225 copy=copy, sort=sort)
--> 226 return op.get_result()
227
228
~\Anaconda3\lib\site-packages\pandas\core\reshape\concat.py in get_result(self)
414
415 obj_labels = mgr.axes[ax]
--> 416 if not new_labels.equals(obj_labels):
417 indexers[ax] = obj_labels.reindex(new_labels)[1]
418
AttributeError: 'list' object has no attribute 'equals'`
对象？
答案 0 :(得分：3)
不能。仅仅有了Class<T>，您就已经在使用反射了。
在Java中，类T可以来自与您的代码分开编译的库（较早或较晚）。这意味着必须使用该类的运行时表示形式来创建实例。
据我所知，C ++确实允许非反射式实例化，但是您需要使用外部库的头文件重新编译代码以使其正常工作，因此使您的代码依赖于所讨论的库。< / p>