这是我的代码:
import pandas as pd
df1 = pd.read_csv("Book3.csv")
df2 = pd.read_csv("Book4.csv")
df2 = df2.dropna(axis=0)
g = df1.groupby('Attribute_spcName')['Char_spcValue'].apply(', '.join) #join attributes usin commas
df2['Char_spcValue'] = df2['Attribute_spcName'].map(g)
df2.rename(columns={
'Attribute_spcName': 'Attributes',
'Char_spcValue': 'Values'}, inplace=True)
df2 = df2[['Attributes', 'Values']]
df2.to_csv("AttributeHasValues.csv", index=False)
这是我的结果:
TypeErrorTraceback (most recent call last)
<ipython-input-1-91bb6ac8d567> in <module>()
4 df2 = pd.read_csv("Book4.csv")
5 df2 = df2.dropna(axis=0)
----> 6 g = df1.groupby('Attribute_spcName')['Char_spcValue'].apply(', '.join)
#join attributes usin commas
7 df2['Char_spcValue'] = df2['Attribute_spcName'].map(g)
8 df2.rename(columns={
C:\Users\tt20172129\AppData\Local\Continuum\anaconda2\lib\site-packages\pandas\core\groupby.pyc in apply(self, func, *args, **kwargs)
714 # ignore SettingWithCopy here in case the user mutates
715 with option_context('mode.chained_assignment', None):
--> 716 return self._python_apply_general(f)
717
718 def _python_apply_general(self, f):
C:\Users\tt20172129\AppData\Local\Continuum\anaconda2\lib\site-packages\pandas\core\groupby.pyc in _python_apply_general(self, f)
718 def _python_apply_general(self, f):
719 keys, values, mutated = self.grouper.apply(f, self._selected_obj,
--> 720 self.axis)
721
722 return self._wrap_applied_output(
C:\Users\tt20172129\AppData\Local\Continuum\anaconda2\lib\site-packages\pandas\core\groupby.pyc in apply(self, f, data, axis)
1800 # group might be modified
1801 group_axes = _get_axes(group)
-> 1802 res = f(group)
1803 if not _is_indexed_like(res, group_axes):
1804 mutated = True
TypeError: sequence item 3: expected string, float found
如何解决这个问题？在我的 .xml 中，这些值是字符串。
最佳答案
IIUC 需要使用 lambda 函数转换为 string:
g=df1.groupby('Attribute_spcName')['Char_spcValue'].apply(lambda x: ', '.join(x.astype(str)))
关于python - 发现类型错误 : sequence item 3: expected string, float ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/49359266/