SyntaxError: invalid syntax when coding in python -

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the code have is

>>> string import ascii_lowercase >>> collections import counter >>> open('example.txt') f:         print counter(letter line in f                letter in line.lower()                if letter in ascii_lowercase)

however, i'm getting syntaxerror: invalid syntax highlights counter on line print counter... , don't know why

in python3, print function. therefore, need surround arguments parentheses when call it:

% python python 3.4.3 (default, oct 14 2015, 20:28:29)  [gcc 4.8.4] on linux type "help", "copyright", "credits" or "license" more information. >>> print 1   file "<stdin>", line 1     print 1           ^ syntaxerror: missing parentheses in call 'print'  >>> print(1) 1

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