shopping list help
Create a program that reads data from a file and writes data to the file.... Use a list to store the data read from the file.... The data that you will have is a grocery list. Store data read from file in a list. The user should be able to see the list and add to it.
How do I accomplish this?
I have attached my code
This code works to view the txt file, but I need the user to be able to add items to the shopping list. How do I do that?
you can take an array and have it write to the file like this:
things_to_write = ["toast","cereal","watermelon"] old_file = open("grocery_list.txt","r").read() # read the file (and convert it to a mutable string) before you can manipulate anything # add the new things to the string for i in things_to_write: old_file += i old_file += "\n" with open("grocery_list.txt","w") as text_file: # (the second parameter, "w", is what lets you write to the file) for i in old_file: text_file.write(i) # rewriting everything to the file
I think this answers your question :)
To read everything from a file you can try:
lines =  with open('your_file_name.txt') as file: for line in file: lines.append(line)
You can put a special character or string at the start of the grocery list so you know where it starts in the file (in this example I'm looking for 'START'):
grocery_list_start = 0 for i in range(0, len(lines)): if (line == 'START'): # ok i found where my list starts grocery_list_start = i + 1 break # pick up where I left off for i in range(grocery_list_start, len(lines)): print(lines[i])