column_a = df['A']```2.使用列的位置作为索引:```python 提取第一列的数据 first_column = [:, 0]```注意:使用`iloc`方法时,行索引是从0开始的,而列索引是从1开始的。因此,要提取第一列,需要使用`iloc[:, 0]`。3.使用`get`方法:```python 提取列'B'的数据 column_b =
select `This is a test-dash col` , `This is a test-col name` as `new col name` from dfTableDash limit 20 1. 2. 3. 4. 5. 6. 6.2 使用col()、column()方法时,如果列名包含保留字符则不需要转义符转义,直接引用列名。(因为col方法参数是String) 而使用expr()方法时,如果列名包含保留字符则...
insert(loc, column, value[, allow_duplicates])在指定位置插入列到DataFrame中。interpolate([method, ...
insert(loc, column, value[, allow_duplicates])在指定位置插入列到DataFrame中。interpolate([method, ...
DataFrame.xs(key[, axis, level, drop_level]) #Returns a cross-section (row(s) or column(s)) from the Series/DataFrame. DataFrame.isin(values) #是否包含数据框中的元素 DataFrame.where(cond[, other, inplace, …]) #条件筛选 DataFrame.mask(cond[, other, inplace, …]) #Return an object...
_getitem_column(key) 1965 1966 def _getitem_column(self, key): /Users/Ted/anaconda/lib/python3.6/site-packages/pandas/core/frame.py in _getitem_column(self, key) 1969 # get column 1970 if self.columns.is_unique: -> 1971 return self._get_item_cache(key) 1972 1973 # duplicate ...
示例3:使用get_loc方法 importpandasaspd# 创建DataFramedf=pd.DataFrame({'A':[1,2,3],'B':[4,5,6]},index=['a','b','c'])# 使用get_loc来获取列的位置try:col_index=df.columns.get_loc('C')print(df.iloc[0,col_index])exceptKeyError:print("Column 'C' does not exist.") ...
df===# 显示df中的数据ABC0t1 china a|b|c1t2 usa d|e|f 1. 使用split拆分 对C列,按照|进行拆分 代码语言:javascript 代码运行次数:0 运行 AI代码解释 column_C=df['C'].str.split('|',expand=True)===# 显示column_C的数据0120a b c1d e f 2. 使用stack行转列 代码语言:javascript 代码运...
DataFrameColumn DataFrameColumnCollection DataFrameColumnCollection Properties Methods ClearItems GetArrowStringColumn GetBooleanColumn GetByteColumn GetCharColumn GetDateTimeColumn GetDecimalColumn GetDoubleColumn GetInt16Column GetInt32Column GetInt64Column ...
insert one column from std::vector & remove column get a row of data by index of the row get a column of data by string of the column concat & add double dataFrame object (horizontally & vertically) support single variable with multiple types, including char, int, long int, float, doubl...