text loading

loading.py

spinsize = 10
spinpos = 0
spindir = 1

def spin():
    global spinsize,spinpos,spindir
    spinstr = '.'*spinpos + \
            '|' + '.'* (spinsize - spinpos -1)
    sys.stdout.write('\r'+spinstr+' ')
    sys.stdout.flush()

    spinpos += spindir
    if spinpos < 0:
        spindir = 1
        spinpos = 1
    elif spinpos >= spinsize:
        spinpos -= 2
        spindir = -1