Write Kaggle python coding for the following :

- Create a new dataframe called "startups_gulf" that contains only the following columns: city_x, org_name, investment_type, investor_count, raised_amount_usd, and post_money_valuation_usd.

- Convert the investment_type column from categorical text to numeric and replace the "investment_type" column with the converted numeric values.

- Use the following variables from the "startups_gulf" dataframe as input: investment_type, investor_count, and raised_amount_usd.

- Create a linear regression model to predict the post_money_valuation_usd