reshape data using python?

Assuming the original file is "original.csv", and you want to save it as "new.csv" I would do:

pd.read_csv("original.csv").groupby(by=["vc_firm_name"],as_index=False).aggregate(lambda x: ','.join(x)).to_csv("new.csv", index=False)

If you care about performance, then I suggest you take a look at other methods (such as using numpy, or sorting the table):

1. https://stackoverflow.com/a/42550516/17323241
2. https://stackoverflow.com/a/66018377/17323241
3. https://stackoverflow.com/a/22221675/17323241 (look at second comment)

Otherwise, you can do:

# load data from csv file
df = pd.read_csv("example.csv")
# aggregate
df.groupby("vc_first_name")["investment_industry"].apply(list)