BeautifulSoup: Extract "img alt" content Web Scraping in Python

I am working in python 3. My objective is extracting differents values of one table and to put them in differents lists.

The problem is that i can't take the value of "img alt" in a td.

This is my code:

    from bs4 import BeautifulSoup
import urllib.request

redditFile = urllib.request.urlopen("http://ift.tt/1XVs1Vo")
redditHtml = redditFile.read()
redditFile.close()
soup = BeautifulSoup(redditHtml)
all_tables = soup.find_all('table')

right_table = soup.find('table', class_='table table-bordered table-striped table-condensed movers-table')

#create a list
A=[]
B=[]
C=[]
D=[]

for row in right_table.findAll("tr"):
    cells = row.findAll('td')
    increment = row.findAll('span')
    colection = row.findAll('img')
    link = row.findAll('a')
    if len(cells) == 6:
        A.append(cells[0].find(text=True))
        B.append(increment[0].find(text=True))
        C.append(colection[0])
        D.append(link[0].find(text=True))
print(A)
print(B)
print(C)
print(D)

This code gives me this result:

['1', '2', '3', '4', '5', '6', '7', '8', '9', '10']
['+8.40', '+2.47', '+1.35', '+1.28', '+1.14', '+0.99', '+0.94', '+0.91', '+0.90', '+0.75']
[<img alt="ORI" class="sprite-set_symbols_ORI" src="//assets1.mtggoldfish.com/assets/s-407aaa9c9786d606684c6967c47739c5.gif"/>, <img alt="PRM" class="sprite-set_symbols_PRM" src="//assets1.mtggoldfish.com/assets/s-407aaa9c9786d606684c6967c47739c5.gif"/>, <img alt="8ED" class="sprite-set_symbols_8ED" src="//assets1.mtggoldfish.com/assets/s-407aaa9c9786d606684c6967c47739c5.gif"/>, <img alt="EX" class="sprite-set_symbols_EX" src="//assets1.mtggoldfish.com/assets/s-407aaa9c9786d606684c6967c47739c5.gif"/>, <img alt="TSB" class="sprite-set_symbols_TSB" src="//assets1.mtggoldfish.com/assets/s-407aaa9c9786d606684c6967c47739c5.gif"/>, <img alt="WL" class="sprite-set_symbols_WL" 

src="//assets1.mtggoldfish.com/assets/s-407aaa9c9786d606684c6967c47739c5.gif"/>, , , , ] ["Jace, Vryn's Prodigy", "Gaea's Cradle", 'Ensnaring Bridge', 'City of Traitors', 'Pendelhaven', 'Firestorm', 'Kor Spiritdancer', 'Scalding Tarn', 'Daybreak Coronet', 'Grove of the Burnwillows']

But I need the IMG ALT VALUE in (for exemple the first img alt value is "ORI")

colection variable

I don't have any idea that I can do. Guys, could you help me with this, please?

Thanks so much in advance