cancel
Showing results for 
Search instead for 
Did you mean: 
Data Engineering
Join discussions on data engineering best practices, architectures, and optimization strategies within the Databricks Community. Exchange insights and solutions with fellow data engineers.
cancel
Showing results for 
Search instead for 
Did you mean: 

Python: Generate new dfs from a list of dataframes using for loop

Jack
New Contributor II

I have a list of dataframes (for this example 2) and want to apply a for-loop to the list of frames to generate 2 new dataframes.

To start, here is my starting dataframe called df_final:

df_longFirst, I create 2 dataframes: df2_b2c_fast, df2_b2b_fast:

for x in df_final['b2b_b2c_prod'].unique():
    locals()['df2_' + x ] = df_final[(df_final['b2b_b2c_prod'] == x ) ]

Second I calculate the correlation between ADV and pkg_yld:

df_corrs_fast_b2c=df2_b2c_fast.groupby(['bus_nm','id']).corr(method='spearman').unstack().iloc[:,1]
df_corrs_fast_b2b=df2_b2b_fast.groupby(['bus_nm','id']).corr(method='spearman').unstack().iloc[:,1]

 Third I convert each to dataframes:

corrs_b2b_fast = (df2_b2b_fast[['adv', 'id']]
        .groupby('id')
        .corrwith(df1['pkg_yld'])
        .rename(columns={'adv' : 'correl'})
        .reset_index())     
 
corrs_b2c_fast = (df2_b2c_fast[['adv', 'id']]
        .groupby('id')
        .corrwith(df1['pkg_yld'])
        .rename(columns={'adv' : 'correl'})
        .reset_index())

Here is one of the 2 dataframes corrs_b2c_fast:

viewQuestion: I want to consolidate the steps where (1) I extract my 2 dataframes, (2) estimate the correlations and (3) convert to 2 dataframes using a for loop (corrs_b2b_fast, corrs_b2c_fast); I started below but got stuck:

df_list=[df2_b2b_fast, df2_b2c_fast]      # Subset of dfs
 
for x in df_list['b2b_b2c_prod']:  
 
locals()['corrs_' + x ] = df_list[(df_list['b2b_b2c_prod'] == x ) ]     # Create new 2 dfs from main df 'b2b_b2c_prod'
x= x.groupby(['bus_nm','id']).corr(method='spearman').unstack().iloc[:,1]  # calculate corr between pkg_yld and ADV 
 
  # stuck here...lines needed to create dataframes corrs_b2b_fast, corrs_b2c_fast??

What's wrong?

1 REPLY 1

Aviral-Bhardwaj
Esteemed Contributor III

thanks

AviralBhardwaj

Connect with Databricks Users in Your Area

Join a Regional User Group to connect with local Databricks users. Events will be happening in your city, and you won’t want to miss the chance to attend and share knowledge.

If there isn’t a group near you, start one and help create a community that brings people together.

Request a New Group