从现有数据框中创建新数据框，其中一列中的唯一值和其他列中的对应值

Question

I have a dataframe 'raw' that looks like this -

It has many rows with duplicate values in each column. I want to make a new dataframe 'new_df' which has unique customer_code corresponding and market_code . The new_df should look like this -

Answer 1

It sounds like you simply want to create a DataFrame with unique customer_code which also shows market_code . Here's a way to do it:

df = df[['customer_code','market_code']].drop_duplicates('customer_code')

Output:

  customer_code market_code
0        Cus001     Mark001
1        Cus003     Mark003
3        Cus004     Mark003
4        Cus005     Mark004

The part reading df[['customer_code','market_code']] gives us a DataFrame containing only the two columns of interest, and the drop_duplicates('customer_code') part eliminates all but the first occurrence of duplicate values in the customer_code column (though you could instead keep the last occurrence of each duplicate by calling it using the keep='last' argument).