Would I be able to extract the data from Bloomberg, if I don't have a Bloomberg Serial Number. What I mean, is I have Bloomberg on my computer and a login, but I can't access it as I don't have a Bloomberg terminal. If i can't do this, what other sources could I use to get multiple stock price information because I heard Yahoo and GOOGLE API are no longer running.
Do you have access to Bloomberg Professional? i.e. are you/someone paying ~$2k/month licence fee? You don't need to have a physical Terminal to use Bloomberg Professional Service. If you actually have Bloomberg on your computer then yes you are able to extract data via API.
How are you planning on using the data? There is a fairly in depth user manual here if you want to know all the nitty gritty --> https://data.bloomberglp.com/labs/sites/2/2014/07/blpapi-developers-guide-2.54.pdf
If you have Bloomberg, and can navigate to some of the data you want to retrieve, please elaborate a little more on what you want to achieve and I can help further.
If however you don't actually have Bloomberg Professional and are looking for alternate sources of financial market data, here's a few you may want to look into:
Also if you are going to be coding a strategy in Python, perhaps check out the following sites where you can get stock data and a built-in IDE. Both very popular: