Try pour urllib

bertrand@bertrand-X200CA:~/linux/script$ py /home/bertrand/linux/script/updatedns3.py
/usr/bin/py:16: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3, and in 3.9 it will stop working
  from collections import Iterable
Traceback (most recent call last):
  File "/usr/bin/py", line 167, in <module>
    result = eval(args.expression)
  File "<string>", line 1
    /home/bertrand/linux/script/updatedns3.py
    ^
SyntaxError: invalid syntax

#!/usr/bin/python
#doc [https://api.gandi.net/docs/livedns/]
import requests
import urllib.request
import smtplib    ## Importation du module
import datetime
from urllib2 import urlopen
from urllib2 import HTTPError
from urllib2 import URLError

 
headers = {'authorization': 'Apikey -------------------------------------'}


now = datetime.datetime.now()
print (now.strftime("%d/%m/%Y %H:%M:%S "))


# Recupere l'Ip externe
try:
 #page = urllib.urlopen("http://www.monip.org/").read()
 #ip = page.split("IP : ")[1].split("<br>")[0]
 ip = urllib.request.urlopen('http://ip.42.pl/raw', timeout=0.03).read()
except urllib.request.socket.timeout as e:
 print (" Time-out .")
 exit()
except urllib.request.socket.error as e:
 print ("URLError : Une autre erreur avec le serveur .")
 exit()
except urllib.request.HTTPError as e:
 print ("HTTPError : Le serveur n a pas pu repondre a la demande.")
 print ('Code erreur : ', e.code)
 exit()
except urllib.request.URLError as e:
 print ("URLError : Nous n\'avons pas reussi a atteindre le serveur .")
 print ("Code erreur : ", e.reason)
except Exception as e:
 print("oups",e)


print (ip)
#api gandy GET @
url = "https://api.gandi.net/v5/livedns/domains/bertrandperrier.fr/records/@/A"
response = requests.request("GET", url, headers=headers)
print("GET @")
print(response.text)


#api gandy GET www
url = "https://api.gandi.net/v5/livedns/domains/bertrandperrier.fr/records/www/A"
response = requests.request("GET", url, headers=headers)
print("GET www")
print(response.text)


#l'adresse ip est differente
if response.text.find(str(ip)) == -1:
 
 print ("*********************")
 print ("******ip differente, faire le PUT A******")
 print ("*********************")

 serveur = smtplib.SMTP('smtp.gmail.com', 587) ## Connexion au serveur sortant (en precisant son nom et son port)
 serveur.starttls() ## Specification de la securisation
 serveur.login("--------------------------", "----------------------")    ## Authentification
 message = "envoi d'un PUT "+str(ip)    ## Message a envoyer
 serveur.sendmail("------------------------@gmail.com", "------------------@laposte.net", message)    ## Envoie du message
 serveur.quit()    ## Deconnexion du serveur

 next_put = {"rrset_type" : "@", "rrset_values" : [str(ip)]}
 
 print("PUT A")
 print next_put
 url = "https://api.gandi.net/v5/livedns/domains/bertrandperrier.fr/records/@/A"
 response = requests.put(url, json=next_put, headers=headers)
 print("reponse du put A")
 print(response.text)

 next_put = {"rrset_type" : "www", "rrset_values" : [str(ip)]}
 
 print("PUT www")
 print next_put
 url = "https://api.gandi.net/v5/livedns/domains/bertrandperrier.fr/records/www/A"
 response2 = requests.put(url, json=next_put, headers=headers)
 print("reponse du put www")
 print(response2.text)

 serveur = smtplib.SMTP('smtp.gmail.com', 587) ## Connexion au serveur sortant (en precisant son nom et son port)
 serveur.starttls() ## Specification de la securisation
 serveur.login("---------------------", "------------------------")    ## Authentification
 message = "reponse des PUT. put1:"+response.text+". put2:"+response2.text    ## Message a envoyer
 serveur.sendmail("----------------@gmail.com", "----------------@laposte.net", message)    ## Envoie du message
 serveur.quit()    ## Deconnexion du serveur
else:
 print ("***********************")
 print ("******ip identique*****")
 print ("***********************")

EDIT : Correction des balises de code ( ajout du LANGAGE )