Web scraping tool

I am seeking development of an automated web data extraction application. The tool should programmatically access specific websites, gather contact email addresses embedded within pages, and compile the addresses into a single downloadable file. Rather than manual browsing and copying, the application will retrieve email addresses directly from backend code through simulation of usual page loading. It should seamlessly navigate sites, interpret HTML/JavaScript to find contact strings in a specified format, and organize the yields into a clean spreadsheet format. User-interface for configuration and output should be intuitive and minimal. Primary objectives include contact harvesting from numerous pages in an expedited unobtrusive manner and segmentation of the compiled addresses for simplified import into email marketing services. Experience with web scraping libraries such as Selenium, BeautifulSoup or Scrapy would be beneficial. Proficiency in Python is required for this project.