Python uses Pandas to achieve data merging and connection, including horizontal merging, vertical merging, inner connection, outer connection, etc

Environmental construction and preparation work: 1. Install Python and Pandas libraries: First, you need to install Python on your computer, and then use the 'pip' command to install the Pandas library. You can run the following command from the command line to install Pandas: pip install pandas Dependent class libraries: In this example, we will use the following libraries: -Pandas: mainly used for data processing and analysis. Dataset: -We will use two sample datasets: 'df1. csv' and 'df2. csv'. These two datasets each contain two identical columns' ID 'and' Name ', but the content of the other columns is different. The dataset can be downloaded through the following link: -'df1. csv ': [Click here to download]（ https://example.com/df1.csv ） -'df2. csv ': [Click here to download]（ https://example.com/df2.csv ） The sample data and complete Python code are as follows: python import pandas as pd #Read Dataset df1 = pd.read_csv('df1.csv') df2 = pd.read_csv('df2.csv') #Horizontal Merge (Merge by Column) merged_df = pd.concat([df1, df2], axis=1) Print ("Horizontal Merge Result:") print(merged_df) #Vertical Merge (Merge by Row) merged_df = pd.concat([df1, df2], axis=0) Print ("Vertical Merge Result:") print(merged_df) #Internal connection merged_df = pd.merge(df1, df2, on='ID', how='inner') Print ("Inner connection result:") print(merged_df) #External connection merged_df = pd.merge(df1, df2, on='ID', how='outer') Print ("External connection result:") print(merged_df) In this example code, the 'PD. concat' function is used for horizontal and vertical merging, and the 'PD. merge' function is used for inner and outer concatenation. Specify the direction of the merge by specifying the 'axis' parameter (0 represents vertical, 1 represents horizontal), specify the column by which the connection is based by specifying the' on 'parameter, and specify the connection method by specifying the' how 'parameter (' inner 'represents inner connection, and' outer 'represents outer connection). Finally, print out the results for each connection.