How to split code string properly

I am trying to write a basic lexical analyzer for Java in Python. The problem I am facing right now is splitting a line of string into words/tokens.

Example:

if (x < 3)
{
    x = 3;
}
else
{
    x = 0;
}

I want this to return a list like this:

["if", "(", "x", "<", "3", ")", ...

But my code is returning

["if", "(x", "<", "3)"]

My Code:

for line in code.readlines():
    for word in line.split():
        print word

I searched for a solution but only found solutions using regular expressions, is there a way to do this without regular expressions? Because I have no idea how to use them and I do not have enough time right now to learn it...

Any help will be appreciated...