Question

我不明白如何在图表上绘制xticks。我想将数据框的“运动”列用作我的xticks值。

数据在图像中。

div1['Athletes'] = pd.to_numeric(div1.Athletes.str.replace(',', ''))
ax = div1[['Sport','Athletes']].plot(kind='bar', title="Number of Athletes in Men's Individual Sports in NCAA Division 1", figsize=(15, 10), legend=True, fontsize=12)
SportList = div1['Sport'].tolist()
ax.set_xticklabels(SportList)

错误：

AttributeError                            Traceback (most recent call last)
<ipython-input-44-4b8025d176c6> in <module>()
----> 1 div1['Athletes'] = pd.to_numeric(div1.Athletes.str.replace(',', ''))
  2 ax = div1[['Sport','Athletes']].plot(kind='bar', title="Number of Athletes in Men's Individual Sports in NCAA Division 1", figsize=(15, 10), legend=True, fontsize=12)
  3 SportList = div1['Sport'].tolist()
  4 ax.set_xticklabels(SportList)

/opt/conda/lib/python3.5/site-packages/pandas/core/generic.py in 
__getattr__(self, name)
   2738         if (name in self._internal_names_set or name in self._metadata or
   2739                 name in self._accessors):
-> 2740             return object.__getattribute__(self, name)
   2741         else:
   2742             if name in self._info_axis:

/opt/conda/lib/python3.5/site-packages/pandas/core/base.py in __get__(self, instance, owner)
    239             # this ensures that Series.str.<method> is well defined
    240             return self.accessor_cls
--> 241         return self.construct_accessor(instance)
    242 
    243     def __set__(self, instance, value): 

/opt/conda/lib/python3.5/site-packages/pandas/core/strings.py in 
_make_str_accessor(self)
   1839             # (instead of test for object dtype), but that isn't practical for
   1840             # performance reasons until we have a str dtype (GH 9343)
-> 1841             raise AttributeError("Can only use .str accessor with string "
   1842                                  "values, which use np.object_ dtype in "
   1843                                  "pandas")

AttributeError: Can only use .str accessor with string values, which use np.object_ dtype in pandas

Answer 1

您的Athletes系列包含的类型不是不是字符串。如果确定其中某些值是字符串，则可以在使用str访问器之前先转换为.str：

div1['Athletes'] = pd.to_numeric(div1['Athletes'].astype(str).str.replace(',', ''))

Answer 2

在使用.plot方法之前，将DataFrame索引设置为'Sport'，大熊猫将处理其余部分：

ax = div1[['Sport','Athletes']].set_index('Sport').plot(kind='bar', title="Number of Athletes in Men's Individual Sports in NCAA Division 1", figsize=(15, 10), legend=True, fontsize=12, rot=0)

如何为条形图绘制xtick值？

2 个答案: