does try really need to be a keyword?

[Gribouillis]

It doesn't need to care about indents. I mean the 'untokenize' module cares about them but adddot doesn't. Here is an example (taken from pymotw 3)

import io
# this is PYTHON CODE WITHOUT DOTS
code = r'''
def show_tree(tree, total_width=36, fill=' '):
    """Pretty-print a tree."""
    output = StringIO()
    last_row = -1
    for i, n in enumerate(tree):
        if i:
            row = int(math floor(math log(i + 1, 2)))
        else:
            row = 0
        if row != last_row:
            output write('\n')
        columns = 2 ** row
        col_width = int(math floor(total_width / columns))
        output write(str(n) center(col_width, fill))
        last_row = row
    print(output getvalue())
    print('-' * total_width)
    print()
'''

result = adddot(io.StringIO(code))
print(result)

Output:
def show_tree(tree, total_width=36, fill=' '):
    """Pretty-print a tree."""
    output = StringIO()
    last_row = -1
    for i, n in enumerate(tree):
        if i:
            row = int(math.floor(math.log(i + 1, 2)))
        else:
            row = 0
        if row != last_row:
            output.write('\n')
        columns = 2 ** row
        col_width = int(math.floor(total_width / columns))
        output.write(str(n).center(col_width, fill))
        last_row = row
    print(output.getvalue())
    print('-' * total_width)
    print()

As you can see, it added the dots at their proper places without modifying the indentation.

I should modernize the code one day or the other because generate_tokens() is deprecated in favor of tokenize() which takes bytes instead of text... A minor change.