Create a typewriter-effect animation for strings in Python

Because you tagged your question with python 3 I will provide a python 3 solution:

1. Change your end character of print to an empty string: print(..., end='')
2. Add sys.stdout.flush() to make it print instantly (because the output is buffered)

Final code:

from time import sleep
import sys

for x in line_1:
    print(x, end='')
    sys.stdout.flush()
    sleep(0.1)

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Making it random is also very simple.

1. Add this import:

   from random import uniform
   

2. Change your sleep call to the following:

   sleep(uniform(0, 0.3))  # random sleep from 0 to 0.3 seconds
   

lines = ["You have woken up in a mysterious maze",
         "The building has 5 levels",
         "Scans show that the floors increase in size as you go down"]

from time import sleep
import sys

for line in lines:          # for each line of text (or each message)
    for c in line:          # for each character in each line
        print(c, end='')    # print a single character, and keep the cursor there.
        sys.stdout.flush()  # flush the buffer
        sleep(0.1)          # wait a little to make the effect look good.
    print('')               # line break (optional, could also be part of the message)

To iterate over the lines, change the loop to:

for x in (line_1, line_2, line_3):