Animation for long string

line_animation.py

""" Animation for long string

Usage:
myapp.py:
-----------------------------------------------------------------------------------
line = 'Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod'
idx = 0
while True:
    idx, short_line = line_animation(line, idx, 5)
    print(short_line, end='\r')
    time.sleep(0.2)
-----------------------------------------------------------------------------------

Now see animation:

$ python3 myapp.py

Lorem ipsu

"""


def line_animation(line, idx, limit=10):
    line_start = 0
    line_end = len(line)
    line = (' ' * (limit - 1)) + line
    if limit+idx > line_end:
        line = line + ' '
    short_line = line[line_start+idx:limit+idx]
    idx += 1
    if idx > (line_end + limit) - 1:
        idx = 0
    short_line = short_line+(' '*(limit-len(short_line)))
    return (idx, short_line)