[Python] Inputting the time and comparing it with user input

I'm trying to make a function run within a Python script at a certain time given by the user. To do this I'm using the datetime module.

This is part of the code so far:

import os
import subprocess
import shutil
import datetime
import time

def process():

path = os.getcwd()
outdir = os.getcwd() + '\Output'

if not os.path.exists(outdir):
os.mkdir(outdir, 0777)

for (root, dirs, files) in os.walk(path):
filesArr = []
dirname = os.path.basename(root)
parent_dir = os.path.basename(path)

if parent_dir == dirname:
outfile = os.path.join(outdir, ' ' + dirname + '.pdf')
else:
outfile = os.path.join(outdir, parent_dir + ' ' + dirname + '.pdf')

print " "
print 'Processing: ' + path

for filename in files:
if root == outdir:
continue
if filename.endswith('.pdf'):
full_name = os.path.join(root, filename)
if full_name != outfile:
filesArr.append('"' + full_name + '"')

if filesArr:
cmd = 'pdftk ' + ' '.join(filesArr) + ' cat output "' + outfile + '"'
print " "
print 'Merging: ' + str(filesArr)

print " "

sp = subprocess.Popen(cmd)

print "Finished merging documents successfully."

sp.wait()

return

now = datetime.datetime.now()
hour = str(now.hour)
minute = str(now.minute)
seconds = str(now.second)
time_1 = hour + ":" + minute + ":" + seconds

print "Current time is: " + time_1

while True:
time_input = raw_input("Please enter the time in HH:MM:SS format: ")

try:
selected_time = time.strptime(time_input, "%H:%M:%S")
print "Time selected: " + str(selected_time)

while True:
if (selected_time == time.localtime()):
print "Beginning merging process..."
process()
break
time.sleep(5)

break

except ValueError:
print "The time you entered is incorrect. Try again."


The problem is having is trying to find a way on how to compare the user inputted time with the current time (as in, the current time for when the script is running). Also, how do I keep a python script running and process a function at the given time?

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