Pandas Get Unique Values in Column Unique is also referred to as distinct, you can get unique values in the column using pandasSeries.unique()function, since this function needs to call on the Series object, usedf['column_name']to get the unique values as a Series. Syntax: # Syntax of ...
'unique_values': {col: df[col].nunique() for col in df.columns} } return pd.DataFrame(report.items(), columns=['Metric', 'Value']) 特征工程:# 创建新特征df['age_group'] = pd.cut(df['age'], bins=[0, 18, 35, 50, 100], labels=['child', 'young', 'middle', 'old'])#...
We are supposed to find the unique values from multiple groupby. Getting unique values from multiple columns in a pandas groupby For this purpose, we can use the combination ofdataframe.groupby()andapply()method with the specifiedlambda expression. Thegroupby()method is a simple but very use...
Here,dfis the dataframe for which you want to know the unique counts. It returns a pandas Series of counts. By default, the pandas dataframenunique()function counts the distinct values alongaxis=0, that is, row-wise which gives you the count of distinct values in each column. Examples Le...
Find the column name which has the maximum value for each row How to find unique values from multiple columns in pandas? How to modify a subset of rows in a pandas DataFrame? Learn & Test Your Skills Python MCQsJava MCQsC++ MCQsC MCQsJavaScript MCQsCSS MCQsjQuery MCQsPHP MCQsASP.Net MCQs...
Series s.loc[indexer] DataFrame df.loc[row_indexer,column_indexer] 基础知识 如在上一节介绍数据结构时提到的,使用[](即__getitem__,对于熟悉在 Python 中实现类行为的人)进行索引的主要功能是选择较低维度的切片。以下表格显示了使用[]索引pandas 对象时的返回类型值: 对象类型 选择 返回值类型 Series seri...
unique()) ['东莞' '深圳' '广州' '北京' '上海' '南京'] 六、查看数据表数值 import pandas as pd df = pd.DataFrame(pd.read_excel('test.xlsx', engine='openpyxl')) print(df.values) [[1001 Timestamp('2024-01-02 00:00:00') '东莞' '100-A' 23 1200.0] [1002 Timestamp('2024-01...
It also compares the Missing Values% and Unique Values% between the two dataframes and adds a comment in the "Distribution Difference" column if the two percentages are different. You can exclude target column(s) from comparison between train and test. ...
memory_usage() Returns the memory usage of each column merge() Merge DataFrame objects min() Returns the min of the values in the specified axis mod() Modules (find the remainder) of the values of a DataFrame mode() Returns the mode of the values in the specified axis mul() Multiplies...
apply(lambda x: x * 2) # 对指定列应用函数并创建新列 df['new_column'] = df['column_name'].map({old_value: new_value}) # 将列中的值替换为新值 数据透视表: 使用pandas 创建数据透视表,可以更方便地分析数据: pd.pivot_table(df, values='value_column', index='row_column', columns='...