Problem with phython script

[so13839]

Dear all,

I am having a problem with a phython code below

CODE
print "review_number:",review_number
if review_number !=None and review_number != "" :
if int(review_number)>0:
count=0
while count<=(int(review_number)/10):
url_review=unicodedata.normalize('NFKD', url_info).encode('ascii','ignore')+"/reviews/"+unicodedata.normalize('NFKD',unicode(count)).encode('ascii','ignore')
print url_review
page = myopener.open(url_review)
soup = BeautifulSoup(page,"html")
reviwes=soup.findAll(class_="storefront__review divider bottom padding-listItem")
for review in reviwes:
name_reviwer=review.find("span", {"itemprop":"name"}).get_text()
rating_reviwer=review.find(class_="m-review").find("span", class_="squeeze").get("star-rating")
review_text=review.find("p",{"itemprop":"reviewBody"}).get_text().replace("\n","")
# write data in All Reviews.csv file
file_review.writerow([name,name_reviwer, review_text,rating_reviwer])
count =count+1

Below is the error I am getting

Traceback (most recent call last):
File "data_mining.py", line 150, in
url_review=unicodedata.normalize('NFKD', url_info).encode('ascii','ignore')+"/reviews/"+unicodedata.normalize('NFKD',unicode(count)).encode('ascii','ignore')
TypeError: must be unicode, not str