This is a simple python program that allows you to input a list of video names and automatically search all those videos on YouTube and get the YouTube urls

geturls.py

#!/usr/bin/env python

# geturls.py by Jelle Besseling
# This file is licenced under the MIT Licence (MIT)
# The MIT License (MIT)

# Copyright (c) 2014 Jelle Besseling

# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
#
#
#
# Instructions to get a required API key:
# 1. Follow the getting started instructions on this page: https://developers.google.com/youtube/v3/getting-started
# 2. Go to your new project>APIs & auth>Credentials and replace {API KEY HERE} with your acuired API key.
# 3. That's it, have fun getting huge lists of urls.

import sys
import getopt
import os
import requests

def main(argv):
  inputfile = ''
  outputfile = ''
  api_url = 'https://www.googleapis.com/youtube/v3/search?part=id&maxResults=1&q={}&fields=items%2CpageInfo&key={}'
  api_key = '{API KEY HERE}'
  output = ''
  short = False
  
  #Parse the command line arguments
  try:
    opts, args = getopt.getopt(argv,'hsi:o:k:f:',['input=','output=','apikey=','keyfile=','short'])
  except getopt.GetoptError:
    print('geturls.py -i <inputfile> -o <outputfile>')
    sys.exit(2)
  for opt, arg in opts:
    if opt == '-h':
      print("""General usage:
geturls.py -i <inputfile> [-o <outputfile>] [-k <apikey> or -f <keyfile>] -s
short option: long option:
-i            --input    : Specifies the input file
-o            --output   : Specifies the output file
-k            --apikey   : Sets the API key, overwrites api_key in geturls.py
-f            --keyfile  : Specifies an API key file
-s            --short    : Enables short URLS (Without http://youtube.com...)""")
      sys.exit()
    elif opt in ('-s', '--short'):
      short = True
    elif opt in ('-i', '--input'):
      inputfile = arg
    elif opt in ('-o', '--output'):
      outputfile = arg
    elif opt in ('-k', '--apikey'):
      api_key = arg 
    elif opt in ('-f', '--keyfile'):
      try:
        with open(arg) as f:
          api_key = f.read()
      except FileNotFoundError:
        print('Error: No such file:', arg)
  
  #An input file is required
  if not inputfile:
    print('Error: Please give a valid inputfile')
    sys.exit(2)
  print('Input file is', inputfile)
  
  try:
    with open(inputfile) as f:
      errors = 0
      for i,line in enumerate(f):
        try:
          r = requests.get(api_url.format(line, api_key))
          json = r.json()
        except requests.exceptions.ConnectionError:
          print('Error: No internet connection')
          errors = -1
          break
        #Check for a YouTube error. If one occurs the process stops.
        if 'error' in json:
          if json['error']['errors'][0]['reason'] == 'keyInvalid':
            print('Error: Invalid API key')
            errors = -1
            break
          else:
            print('Error:', json)
            errors = -1
            break
        #Notify the user if a video couldn't be found
        elif json['pageInfo']['totalResults'] == 0:
          print('Error: Couldn\'t get url for: ' + line)
          errors += 1
        else:
          if short:
            output += json['items'][0]['id']['videoId'] + '\n'
          else:
            output += "http://youtube.com/watch?v=" + json['items'][0]['id']['videoId'] + '\n'
      if errors == -1:
        print("Getting URLs failed")
      else:
        print('{} of {} urls get'.format(i+1-errors, i+1))
    #Output file defaults to "<inputfile> urls.txt"
    if not outputfile:
      outputfile = os.path.splitext(inputfile)[0] + ' urls.txt'
    with open(outputfile, 'w') as f:
      f.write(output)
  except FileNotFoundError:
    print('Error: No such file:', inputfile)

if __name__ == '__main__':
   main(sys.argv[1:])