Python 3 urllib urlretrieve retry on download fail - python-3.x

Question

I have a program that downloads files from a server. They are anywhere from 2mb to 8mb. It runs through a loop and grabs the number of files I request. The problem is that my internet sucks out here in the middle of the freekin' desert. While everything works beautifully most of the time, sometimes the internet drops during a urllib.request.urlretrieve request and freezes up the program. I need a way to get urllib to detect when the net has dropped, and retry the file until it comes back up again. Any help appreciated!!!
Example of what I am doing:
try:
numimgs = len(imgsToGet)
path1 = "LEVEL II" #HIGHTEST FOLDER
self.fn = imgs.split('/')[-1] #SPLIT OUT NAME FROM LEFT
path2 = self.fn[:4] #SPLIT OUT KICX
path3 = self.fn.split('_')[1] #SPLIT OUT DATE
savepath = os.path.join(path1, path2, path3) #LEVEL II / RADAR / DATE PATH
if not os.path.isdir(savepath): #See if it exists
os.makedirs(savepath) #If not, make it
fileSavePath = os.path.join(path1, path2, path3, self.fn)
if os.path.isfile(fileSavePath): #chcek to see if image path already exists
self.time['text'] = self.fn + ' exists \n'
continue
#DOWNLOAD PROGRESS
def reporthook(blocknum, blocksize, totalsize):
percent = 0
readsofar = blocknum * blocksize
if totalsize > 0:
percent = readsofar * 1e2 / totalsize
if percent >= 100:
percent = 100
s = "\r%5.1f%% %*d / %d" % (
percent, len(str(totalsize)), readsofar, totalsize)
self.time['text'] = 'Downloading File: '+str(curimg)+ ' of '+str(numimgs)+' '+self.fn+'' + s
if readsofar >= totalsize: # near the end
self.time['text'] = "Saving File..."
else: # total size is unknown
self.time['text'] = "read %d\n" % (readsofar)
#UPDATE PROGRESSBAR
self.pb.config(mode="determinate")
if percent > 0:
self.dl_p = round(percent,0)
self.pb['value'] = self.dl_p
self.pb.update()
if percent > 100:
self.pb['value'] = 0
self.pb.update()
urllib.request.urlretrieve(imgs, fileSavePath, reporthook)
except urllib.error.HTTPError as err: #catch 404 not found and continue
if err.code == 404:
self.time['text'] = ' Not Found'
continue
Cheers,
David

Answer 1

You could place the code in a try except block, with a counter. Here is what I had done:
remaining_download_tries = 15
while remaining_download_tries > 0 :
try:
urlretrieve(CaseLawURL,File_Path_and_Name)
print("successfully downloaded: " + CaseLawURL)
time.sleep(0.1)
except:
print("error downloading " + CaseLawURL +" on trial no: " + str(16 - remaining_download_tries))
remaining_download_tries = remaining_download_tries - 1
continue
else:
break
I hope the code is self explanatory. Regards