How to get program to print out dir once, change the cd, and open a text file?

Question

I am writing a program to take input from a user and print out the contents of the cwd, to be able to change the cwd you're working in, to open a text file in the cwd, or to quit the program.

So far, I can get the dir command to list the .txt files in the cwd but its on an endless loop. I can specify a new directory, but the question just repeats itself, and I can get the program to respond to the quit command.

Here is my code:

import os
cwd = os.getcwd()
print("Current working directory: ", cwd)
dirlist = input("Choose DIR, CD, OPEN, or QUIT: ")

while True:
    if dirlist == "dir":
        for x in os.listdir():
            if x.endswith(".txt"):
                print(x)
    elif dirlist == "cd":
        for x in os.listdir():
            changedir = input("Change to what path?")
            print(cwd)
    elif dirlist == "open":
        for x in os.listdir():
            opendir = input("Open what file?")
            open(opendir)
    else:
        print("Ok, goodbye.")
        break

What do I need to do to accomplish these three things:

1. not have an endless loop with the dir input and just loop back to the initial question.
2. take input for a new directory and loop back to the initial question while staying in the new directory.
3. open a text editor after the open input.

Thanks for any advice.

Edit:

Thanks to people in the comments I have solved questions 1 and 3, but question 2 is still stumping me. Here is my current code-

elif dirlist == "cd":
        for x in os.listdir():
            changedir = input("Change to what path?")
            os.chdir(cwd)
            print (changedir)
            break

How do I get the cwd to show up and print as what it was renamed with the input from changedir?