How to spread a column in a Pandas data frame

Question

I have the following pandas data frame:

import pandas as pd
import numpy as np
df = pd.DataFrame({
               \'fc\': [100,100,112,1.3,14,125],
                  


        

Answer 1

you can also use pd.crosstab() method:

In [82]: pd.crosstab(index=df.gene_symbol, columns=df.sample_id, 
                     values=df.fc, aggfunc='mean') \
    ...:   .rename_axis(None,1) \
    ...:   .reset_index()
    ...:
Out[82]:
  gene_symbol     S1     S2
0           a  100.0    1.3
1           b  100.0   14.0
2           c  112.0  125.0