df['liststring'] = df['lists'].agg(lambda x: ','.join(map(str, x)))
df['liststring'] = [','.join(map(str, l)) for l in df['lists']] df lists liststring 0 [1, 2, 12, 6, ABC] 1,2,12,6,ABC 1 [1000, 4, z, a] 1000,4,z,a