使用 Pandas DataFrame 样式为列着色（Python 3）

Posted 2023-02-22

【中文标题】使用 Pandas DataFrame 样式为列着色（Python 3）

【英文标题】：Using Pandas DataFrame style to color a column (Python 3)

【发布时间】：2017-07-03 12:57:39

【问题描述】：

我正在尝试按照http://pandas.pydata.org/pandas-docs/stable/style.html 上的教程为颜色列中我的熊猫数据框上的单元格的背景着色。

仅使用 pandas 的正确方法是什么？

s = """
   num_markers  num_contamination    color
0          2.0                0.0  #db5f57
1        100.0               47.0  #db7157
2        104.0              102.0  #db8457
3        102.0              100.0  #db9657
4          NaN                NaN  #dba957
5         51.0                0.0  #dbbb57
6          NaN                NaN  #dbce57
7         92.0               63.0  #d6db57
8          NaN                NaN  #c4db57
9         56.0               42.0  #b1db57
"""
df = pd.read_clipboard() #Copy and paste then do this
D_idx_color = df["color"].to_dict()
df.style.apply(lambda x:"background-color: %s"%D_idx_color[x], subset=["color"])

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
/Users/jespinoz/anaconda/lib/python3.6/site-packages/IPython/core/formatters.py in __call__(self, obj)
    309             method = get_real_method(obj, self.print_method)
    310             if method is not None:
--> 311                 return method()
    312             return None
    313         else:

/Users/jespinoz/anaconda/lib/python3.6/site-packages/pandas/formats/style.py in _repr_html_(self)
    190     def _repr_html_(self):
    191         """Hooks into Jupyter notebook rich display system."""
--> 192         return self.render()
    193 
    194     def _translate(self):

/Users/jespinoz/anaconda/lib/python3.6/site-packages/pandas/formats/style.py in render(self)
    415         the rendered HTML in the notebook.
    416         """
--> 417         self._compute()
    418         d = self._translate()
    419         # filter out empty styles, every cell will have a class

/Users/jespinoz/anaconda/lib/python3.6/site-packages/pandas/formats/style.py in _compute(self)
    481         r = self
    482         for func, args, kwargs in self._todo:
--> 483             r = func(self)(*args, **kwargs)
    484         return r
    485 

/Users/jespinoz/anaconda/lib/python3.6/site-packages/pandas/formats/style.py in _apply(self, func, axis, subset, **kwargs)
    489         data = self.data.loc[subset]
    490         if axis is not None:
--> 491             result = data.apply(func, axis=axis, **kwargs)
    492         else:
    493             result = func(data, **kwargs)

/Users/jespinoz/anaconda/lib/python3.6/site-packages/pandas/core/frame.py in apply(self, func, axis, broadcast, raw, reduce, args, **kwds)
   4150                     if reduce is None:
   4151                         reduce = True
-> 4152                     return self._apply_standard(f, axis, reduce=reduce)
   4153             else:
   4154                 return self._apply_broadcast(f, axis)

/Users/jespinoz/anaconda/lib/python3.6/site-packages/pandas/core/frame.py in _apply_standard(self, func, axis, ignore_failures, reduce)
   4246             try:
   4247                 for i, v in enumerate(series_gen):
-> 4248                     results[i] = func(v)
   4249                     keys.append(v.name)
   4250             except Exception as e:

<ipython-input-155-3bf2a87dcd1f> in <lambda>(x)
     14 df = pd.read_clipboard() #Copy and paste then do this
     15 D_idx_color = df["color"].to_dict()
---> 16 df.style.apply(lambda x:"background-color: %s"%D_idx_color[x], subset=["color"])

/Users/jespinoz/anaconda/lib/python3.6/site-packages/pandas/core/generic.py in __hash__(self)
    829     def __hash__(self):
    830         raise TypeError('0!r objects are mutable, thus they cannot be'
--> 831                         ' hashed'.format(self.__class__.__name__))
    832 
    833     def __iter__(self):

TypeError: ("'Series' objects are mutable, thus they cannot be hashed", 'occurred at index color')

【参考方案1】：

我认为您不需要将颜色转换为字典，您可以使用 applymap 将您的功能应用于单个元素。

df.style.applymap(lambda x:"background-color: %s"%x, subset=['color'])

如果要根据color列给所有元素上色，可以试试

def to_color(x):
    return ["background-color: %s"%i for i in df.color]
df.style.apply(to_color, axis=0)

【讨论】：

啊伙计，我是如此接近。谢谢，这正是我想要完成的！