Python Pandas: Is Order Preserved When Using groupby() and agg()?

Question

I\'ve frequented used pandas\' agg() function to run summary statistics on every column of a data.frame. For example, here\'s how you would produce the mean an

Answer 1

Even easier:

  import pandas as pd
  pd.pivot_table(df,index='A',aggfunc=(np.mean))

output:

            B    C
     A                
   group1  11.0  101
   group2  17.5  175
   group3  11.0  101