python - Grabbed numbers from an online page, converted to int(), but cannot multiply -

i wrote python script goes online, fetches page, parses page, locates string of numbers (e.g, 5678), , stores in num. now, need perform mathematical functions on num. why can't that?

grabbed line page: number '6678'. hence, line = "the number '6678'"

c = "" num = ''.join(c c in line if c.isdigit()) int(num) print num try=(num*2) print try 

error:

file "script", line 20 try=(num*2)    ^ syntaxerror: invalid syntax 

edit: changed 'try' 't'. silly mistake! but, have new error trying maths 'num', further code:

new = (((num*3)+3)-1000) print new 

error:

traceback (most recent call last): file "602", line 22, in new = (((num*3)+2)-250) typeerror: coercing unicode: need string or buffer, int found

you need reassign casted number:

num = int(num) # num string right