How to merge integers from multiple cells to one in pandas?

Question

I am giving up the SQL solution, and now switching to Pandas. My goal is to merge the integer data as below:

Data input:

ACCT	SOURCES
A	1
A	2
B	1
C	4

expected output:

ACCT	SOURCES
A	1,2
B	1
C	4

Answer 1

Given:

  ACCT  SOURCES
0    A        1
1    A        2
2    B        1
3    C        4

Doing:

df.SOURCES = df.SOURCES.astype(str)
df = df.groupby('ACCT', as_index=False)['SOURCES'].agg(','.join)
print(df)

Output:

  ACCT SOURCES
0    A     1,2
1    B       1
2    C       4