I'm teaching myself programming, using Python as my initial weapon of choice.

I have learnt a few basics and decided to set myself the challenge of asking the user for a list of names, adding the names to a list and then finally writing the names to a .csv file.

What would you do differently, i.e. how could this code be improved for readability and efficiency? Would you approach the situation differently, structure it differently, call different functions? I am interested in, and would appreciate a great deal, the feedback from more experienced programmers.

In particular, I find certain parts clunky; such as having to specify to the user the required format for data entry. If I were to simply request the data (name age location) without the commas however, then each record, when written to .csv, would simply end up as one record per cell (Excel) – this is not the desired result.

guestNames = ""
guestList = []
number = 0
guestNumber = ["second","third","fourth","fifth","sixth"]
finalList = ""

#Requesting user input. 
guestNames = input("Please enter the names of your guests, one at a time.\n"\
    "Once you have finished entering the information, please type the word \"Done\".\n"\
    "Please enter your names in the following format (Name, Age, Location). ").capitalize()

guestList.append(guestNames)

while guestNames.lower() != "done".lower() :
    guestNames = input("Please enter the name of your " + guestNumber[number] + " guest: ").capitalize()
    guestList.append(guestNames)
    number += 1

#Sorting the list. 
guestList.sort()
guestList.remove("Done")

#Creating .csv file. 
guestFile = open("guestList.csv","w")
guestFile.close()

#Writing to file. 
for entries in guestList :
    guestFile = open("guestList.csv","a")
    guestFile.write(entries)
    guestFile.write("\n")
    guestFile.close()