在使用Pandas的pivot函数进行数据重塑时,如果数据框的索引(index)或列标签(columns)包含重复项,将会出现“ValueError: Index contains duplicate entries, cannot reshape”错误。这是因为pivot函数要求索引和列标签是唯一的,以便能够正确地重塑数据。要解决这个问题,你可以采取以下几种方法之一: 删除重复的索引或列标签:...
target, method, level, limit, tolerance)4426raiseValueError("cannot handle a non-unique multi-index!")4427elifnotself.is_unique:4428# GH#42568->4429raiseValueError("cannot reindex on an axis with duplicate labels")4430else:4431indexer, _ = self.get_indexer_non_unique(target) ...
print(d[(d.Item=='Item0')&(d.CType=='Gold')].USD.values) # Pivoted DataFrame: p.USD gives a 'sub-DataFrame' with the USD values only print(p.USD[p.USD.index=='Item0'].Gold.values) 常见错误 从上文的描述中我们可以看出:pivot方法至少需要两个参数—— index 和 columns。那么如果原始...
in Flags.allows_duplicate_labels(self, value) 94 if not value: 95 for ax in obj.axes: ---> 96 ax._maybe_check_unique() 98 self._allows_duplicate_labels = value File ~/work/pandas/pandas/pandas/core/indexes/base.py:715, in Index._maybe_check_unique(...
Index(['Labrador', 'Beagle', None, 'Labrador', 'Lhasa', 'Husky', 'Beagle', None, 'Koala']) # Print the Index idx 输出: 正如我们在输出中看到的,我们有一些缺失的值。让我们看看Index.get_duplicates()函数是如何对待它们的。# print the duplicate values in Index idx.get_duplicates() ...
.sort_index(axis=0,ascending=True,inplace=False) ii)按值(values)对pands对象进行排序 .sort_values(by,axis=0,ascending=True,inplace=False) IV. 丢弃指定轴上的项———用来删行/删列 .drop(labels=None,axis=0,inplace=False) V. DataFrame缺失值处理 i)...
#df.iloc[df['School']=='S_1'].head() #报错df.iloc[(df['School']=='S_1').values].head() [] 操作符 Series的[]操作 (1)单元素索引 s = pd.Series(df['Math'],index=df.index) s[1101]#使用的是索引标签 (2)多行索引
The “drop_duplicates()” method takes the “keep = False” parameter as an argument and retrieves the index value by removing all duplicate index values. Output The index without any duplicate value has been returned successfully. Example 2: Using “Index.drop_duplicates()” Method to Drop/...
5.1 df.sort_index():按索引排序 5.2 df.sort_values():按值排序 6、字符串的修改 6.1 字符串的替换:Series.str.replace() 6.2 字符串空格的清空 6.3 字符串大小写的修改 7、行、列的拆分与合并 7.1 一列变多列 7.2 一行变多行 7.3 多行按类合并成一行 7.4 多列和并成一列 8、Series.map() 8.1...
Duplicate values (s.str.repeat(3) equivalent to x * 3) pad() Add whitespace to left, right, or both sides of strings center() Equivalent to str.center ljust() Equivalent to str.ljust rjust() Equivalent to str.rjust zfill() Equivalent to str.zfill wrap() Split long strings into line...