I'd like to add the 3.7 code. I also changed if answer == b'true':

[developervecchio]

import sys
import requests

total_args = len(sys.argv)
phone_number = '';

if total_args == 1:
print ("Enter the number to validate.")
phone_number = input()
else:
phone_number = sys.argv[1]

if len(phone_number) == 10:
phone_number = '+91' + phone_number
elif len(phone_number) == 11 and phone_number[0] == '0':
phone_number = '+91' + phone_number[1:]

print ("Phone number is " + phone_number)

access_key = 'your access key'
url = 'http://apilayer.net/api/validate?access_key=' + access_key + '&number=' + phone_number
response = requests.get(url)
#print response.content
answer = response.content[9:13]

print(answer)

if answer == b'true':
print (phone_number + " is valid.")
else:
print (phone_number + " is invalid.")

[developervecchio]

In addition I want to create a loop for a list of numbers. I will post it here.
This code works fine and I also want to thank the first contributor for doing this script.

[developervecchio]

Hi as I said before I create a loop to iterate through a list of numbers inside a csv file. Here the code:

import sys
import requests

total_args = len(sys.argv)
phone_number = '';

with open('numbers.csv','r',encoding="utf8") as f:
phone_number = ' '
for lines in f:
# to avoid the \n
lines = f.read().splitlines()
for line in lines:
access_key = 'your_acces_key'
url = 'http://apilayer.net/api/validate?access_key=' + access_key + '&number=+91' + line
response = requests.get(url)
answer = response.content[9:13]
if answer == b'true':
print (phone_number + " is valid.")
else:
print (phone_number + " is invalid.")

Notes: The dial codes are inserterted after &number=.