syntax error?

[Culm]

Newbie -- trying to learn python on mac. Installed v2 and v3. -- tried to run the following script from terminal:

#!/usr/bin/python
# -*- coding: latin-1 -*-
import os, sys

f = open(‘CROSSWD.TXT’, 'r+')
for line in f:
	word=line.strip()
	if len(word)>20:
		print word

this is the error message I get:

Error:
  File "ppp.py", line 5
    f = open(?CROSSWD.TXT?, 'r+')
             ^
SyntaxError: invalid syntax

(the symbol ^ appears under the first question mark -- this post has altered the position)
No problem running it from the interpreter
Thanks in advance

[Gribouillis]

Your CROSSWD.TXT is surrounded with curly quotes, which are invalid string delimiters in the python syntax. This may happen if you copy and paste python code from certain files such as pdf files or rich text files to your python editor. Replace the curly quotes with normal quotes.

[wavic]

The name of the file must be surrounded in quotes.