matplotlib plot_date AttributeError： 'numpy.datetime64'オブジェクトに 'toordinal'属性がありません

Question

matplotlibのplot_dateで次のエラーが表示されます - 下のjupyterノートブックの例です。

Pythonバージョン3.6.3

パンダのバージョン0.21.0

matplotlibの2.1.0

import pandas as pd 
%pylab inline 

datelist = pd.date_range(pd.datetime.today(), periods=100).tolist() 
vals = np.random.rand(100,1) 

エラーなし - pandas._libs.tslib.Timestampとの配列のリスト値：

plt.plot_date(datelist, vals, xdate=True); 

はAttributeError - DataTimeIndexとパンダのDATAFRAME：

注：私のpython 3.4.5を使用してエラーがない、matplotlibの1.5.1、パンダ0.19.2時点

編集開始

Pandas v0.21.0 What's Newおよびduplicate answerの回避策のために、以下の行を挿入してください。

from pandas.tseries import converter 
converter.register() 

編集終了

df = pd.DataFrame(data=vals, index=datelist) 

plt.plot_date(df.index, df[0], xdate=True); 

--------------------------------------------------------------------------- 
AttributeError       Traceback (most recent call last) 
<ipython-input-22-c438634aa06b> in <module>() 
----> 1 plt.plot_date(df.index, df[0], xdate=True); 

~/anaconda3/lib/python3.6/site-packages/matplotlib/pyplot.py in plot_date(x, y, fmt, tz, xdate, ydate, hold, data, **kwargs) 
    3261  try: 
    3262   ret = ax.plot_date(x, y, fmt=fmt, tz=tz, xdate=xdate, ydate=ydate, 
-> 3263       data=data, **kwargs) 
    3264  finally: 
    3265   ax._hold = washold 

~/anaconda3/lib/python3.6/site-packages/matplotlib/__init__.py in inner(ax, *args, **kwargs) 
    1708      warnings.warn(msg % (label_namer, func.__name__), 
    1709         RuntimeWarning, stacklevel=2) 
-> 1710    return func(ax, *args, **kwargs) 
    1711   pre_doc = inner.__doc__ 
    1712   if pre_doc is None: 

~/anaconda3/lib/python3.6/site-packages/matplotlib/axes/_axes.py in plot_date(self, x, y, fmt, tz, xdate, ydate, **kwargs) 
    1515    self.yaxis_date(tz) 
    1516 
-> 1517   ret = self.plot(x, y, fmt, **kwargs) 
    1518 
    1519   self.autoscale_view() 

~/anaconda3/lib/python3.6/site-packages/matplotlib/__init__.py in inner(ax, *args, **kwargs) 
    1708      warnings.warn(msg % (label_namer, func.__name__), 
    1709         RuntimeWarning, stacklevel=2) 
-> 1710    return func(ax, *args, **kwargs) 
    1711   pre_doc = inner.__doc__ 
    1712   if pre_doc is None: 

~/anaconda3/lib/python3.6/site-packages/matplotlib/axes/_axes.py in plot(self, *args, **kwargs) 
    1436 
    1437   for line in self._get_lines(*args, **kwargs): 
-> 1438    self.add_line(line) 
    1439    lines.append(line) 
    1440 

~/anaconda3/lib/python3.6/site-packages/matplotlib/axes/_base.py in add_line(self, line) 
    1757    line.set_clip_path(self.patch) 
    1758 
-> 1759   self._update_line_limits(line) 
    1760   if not line.get_label(): 
    1761    line.set_label('_line%d' % len(self.lines)) 

~/anaconda3/lib/python3.6/site-packages/matplotlib/axes/_base.py in _update_line_limits(self, line) 
    1779   Figures out the data limit of the given line, updating self.dataLim. 
    1780   """ 
-> 1781   path = line.get_path() 
    1782   if path.vertices.size == 0: 
    1783    return 

~/anaconda3/lib/python3.6/site-packages/matplotlib/lines.py in get_path(self) 
    949   """ 
    950   if self._invalidy or self._invalidx: 
--> 951    self.recache() 
    952   return self._path 
    953 

~/anaconda3/lib/python3.6/site-packages/matplotlib/lines.py in recache(self, always) 
    649  def recache(self, always=False): 
    650   if always or self._invalidx: 
--> 651    xconv = self.convert_xunits(self._xorig) 
    652    x = _to_unmasked_float_array(xconv).ravel() 
    653   else: 

~/anaconda3/lib/python3.6/site-packages/matplotlib/artist.py in convert_xunits(self, x) 
    189   if ax is None or ax.xaxis is None: 
    190    return x 
--> 191   return ax.xaxis.convert_units(x) 
    192 
    193  def convert_yunits(self, y): 

~/anaconda3/lib/python3.6/site-packages/matplotlib/axis.py in convert_units(self, x) 
    1489    return x 
    1490 
-> 1491   ret = self.converter.convert(x, self.units, self) 
    1492   return ret 
    1493 

~/anaconda3/lib/python3.6/site-packages/matplotlib/dates.py in convert(value, unit, axis) 
    1601   if units.ConversionInterface.is_numlike(value): 
    1602    return value 
-> 1603   return date2num(value) 
    1604 
    1605  @staticmethod 

~/anaconda3/lib/python3.6/site-packages/matplotlib/dates.py in date2num(d) 
    371   if not d.size: 
    372    return d 
--> 373   return _to_ordinalf_np_vectorized(d) 
    374 
    375 

~/anaconda3/lib/python3.6/site-packages/numpy/lib/function_base.py in __call__(self, *args, **kwargs) 
    2732    vargs.extend([kwargs[_n] for _n in names]) 
    2733 
-> 2734   return self._vectorize_call(func=func, args=vargs) 
    2735 
    2736  def _get_ufunc_and_otypes(self, func, args): 

~/anaconda3/lib/python3.6/site-packages/numpy/lib/function_base.py in _vectorize_call(self, func, args) 
    2802    res = func() 
    2803   else: 
-> 2804    ufunc, otypes = self._get_ufunc_and_otypes(func=func, args=args) 
    2805 
    2806    # Convert args to object arrays first 

~/anaconda3/lib/python3.6/site-packages/numpy/lib/function_base.py in _get_ufunc_and_otypes(self, func, args) 
    2762 
    2763    inputs = [arg.flat[0] for arg in args] 
-> 2764    outputs = func(*inputs) 
    2765 
    2766    # Performance note: profiling indicates that -- for simple 

~/anaconda3/lib/python3.6/site-packages/matplotlib/dates.py in _to_ordinalf(dt) 
    220   tzi = UTC 
    221 
--> 222  base = float(dt.toordinal()) 
    223 
    224  # If it's sufficiently datetime-like, it will have a `date()` method 

AttributeError: 'numpy.datetime64' object has no attribute 'toordinal' 

Answer 1

は、将来的に固定することができる何かのように見える...しかし今のところ、私はPythonの日時に私のパンダの日時を変換して使用すること

pydatetime = pd.Timestamp(item['datetime']).to_pydatetime()