remove all = from a probable base64 string but preserve the last 1 or 2

replace_equal.py

str1="ssdggagad=gadg=adg=dasgadsg=as=gads=gas=as=asgas214=12rf=sdvgewt23g=vew=g4=="
x=str1[len(str1) - 2:]
if x == "==":
    print str1.replace("=","") + x
else:
    print str1.replace("=","") + "="

str2="ssdggagad=gadg=adg=dasgadsg=as=gads=gas=as=asgas214=12rf=sdvgewt23g=vew=g4="
x=str2[len(str2) - 2:]
if x == "==":
    print str2.replace("=","") + x
else:
    print str2.replace("=","") + "="