Python presentation script with a difference

#!/usr/bin/env python


# Ideal for presentations desktop recordings  where you need hands free
# Tested on openSUSE 15.3

#  A small python script that will read a text file in , split this into paragraphs
#  then prints line by line the characters of that paragraph in slow motion in a Linux terminal
#  according to prompt from user

#  Colours of text are interchangeable
#  Speed can be altered for slow motion print of chars Introductory messages and end message changeable Enjoy Mark Harrington

from datetime import datetime
import argparse
import time
import sys
import os


# Author MD Harrington  Facebook https://www.facebook.com/mark.harrington.142892 links to this there as well for you
#
# You need to include a  text file  in your  folder  with the python script make sure  ecah paragraph is seperated by two
# line breaks
# usage ::  python paragraphs.py

# python version Python 2.7.14
# You can also download this from git hub
# https://github.com/markh2016/pyReadparagraphs.git

# global colour settings

CBLACK  = '\33[30m'
CRED    = '\33[31m'
CGREEN  = '\33[32m'
CYELLOW = '\33[33m'
CBLUE   = '\33[34m'
CVIOLET = '\33[35m'
CBEIGE  = '\33[36m'
CWHITE  = '\33[37m'
CYAN  = "\033[1;36m"

CBLACKBG  = '\33[40m'
CREDBG    = '\33[41m'
CGREENBG  = '\33[42m'
CYELLOWBG = '\33[43m'
CBLUEBG   = '\33[44m'
CVIOLETBG = '\33[45m'
CBEIGEBG  = '\33[46m'
CWHITEBG  = '\33[47m'

CGREY    = '\33[90m'
CRED2    = '\33[91m'
CGREEN2  = '\33[92m'
CYELLOW2 = '\33[93m'
CBLUE2   = '\33[94m'
CVIOLET2 = '\33[95m'
CBEIGE2  = '\33[96m'
CWHITE2  = '\33[97m'

CGREYBG    = '\33[100m'
CREDBG2    = '\33[101m'
CGREENBG2  = '\33[102m'
CYELLOWBG2 = '\33[103m'
CBLUEBG2   = '\33[104m'
CVIOLETBG2 = '\33[105m'
CBEIGEBG2  = '\33[106m'
CWHITEBG2  = '\33[107m'
ENDC = '\033[0m'


arraylength=0

# function  definitions


def f_clearscreen(time_delay):
    os.system('clear')
    time.sleep(time_delay)
    for x in range(2):
        print('')




def f_openfile(fileopen):

    global paragraphs
    global arraylength

    # open the file
    f = open(fileopen, "r")
    # read the open file
    data =f.read()
    # split this into paragrapghs
    paragraphs = data.split("\n\n")
    paragraphs[:] = (value for value in paragraphs if value != '\t')
    #get number of paragraghs
    arraylength = len(paragraphs)
    # sleep 3

    time.sleep(4)
    # clear the screen
    os.system('clear')



    f.close()

def  readpar_lines(counter):
     # make this global so that functions can see this
    global lines
    lines= paragraphs[counter].splitlines()



def slowPrint():

    for line in lines:
        for mychar in line:
            sys.stdout.write(CGREEN + mychar)
            sys.stdout.flush()
            time.sleep(0.05)
    sys.stdout.write(ENDC)
    sys.stdout.flush()


def slowPrintMsgString(var):

    for mychar in var:
        sys.stdout.write(CBLUE + mychar)
        sys.stdout.flush()
        time.sleep(0.05)
    sys.stdout.write(ENDC)
    sys.stdout.flush()

# main execution starts here

print("Ready")
f_clearscreen(4.00)

# get filename
m_file = "instructions"

# Print introduction

slowPrintMsgString("Good evening all todays tutorial is on how to use git from within QT\n\n")

# open this file and split into paragraphs
f_openfile(m_file)

# get user input and count
for x in range(arraylength):
    # split each paragraph into lines
    readpar_lines(x)
    slowPrint()
    my_next = raw_input(':')

now = datetime.now()
# dd/mm/YY H:M:S
dt_string = now.strftime("%d/%m/%Y %H:%M:%S")
slowPrintMsgString("\n\nThanking you all for watching presentation Mark Harrington " + dt_string +"\n\n" )

time.sleep(10)

# clear the screen
os.system('clear')