How to use the sqlparse.tokens.Whitespace function in sqlparse

def test_from_subquery():
    # issue 446
    s = u'from(select 1)'
    stmts = sqlparse.parse(s)
    assert len(stmts) == 1
    assert len(stmts[0].tokens) == 2
    assert stmts[0].tokens[0].value == 'from'
    assert stmts[0].tokens[0].ttype == T.Keyword

    s = u'from (select 1)'
    stmts = sqlparse.parse(s)
    assert len(stmts) == 1
    assert len(stmts[0].tokens) == 3
    assert stmts[0].tokens[0].value == 'from'
    assert stmts[0].tokens[0].ttype == T.Keyword
    assert stmts[0].tokens[1].ttype == T.Whitespace

yield sql.Token(T.Whitespace, '\n')
        yield sql.Token(T.Name, varname)
        yield sql.Token(T.Whitespace, ' ')
        if has_nl:
            yield sql.Token(T.Whitespace, ' ')
        yield sql.Token(T.Operator, '=')
        yield sql.Token(T.Whitespace, ' ')
        yield sql.Token(T.Text, '"')

        # Print the tokens on the quote
        for token in stream:
            # Token is a new line separator
            if token.is_whitespace and '\n' in token.value:
                # Close quote and add a new line
                yield sql.Token(T.Text, ' ";')
                yield sql.Token(T.Whitespace, '\n')

                # Quote header on secondary lines
                yield sql.Token(T.Name, varname)
                yield sql.Token(T.Whitespace, ' ')
                yield sql.Token(T.Operator, '.=')
                yield sql.Token(T.Whitespace, ' ')
                yield sql.Token(T.Text, '"')

                # Indentation
                after_lb = token.value.split('\n', 1)[1]
                if after_lb:
                    yield sql.Token(T.Whitespace, after_lb)
                continue

            # Token has escape chars
            elif '"' in token.value:

yield sql.Token(T.Name, varname)
        yield sql.Token(T.Whitespace, ' ')
        yield sql.Token(T.Operator, '=')
        yield sql.Token(T.Whitespace, ' ')
        if has_nl:
            yield sql.Token(T.Operator, '(')
        yield sql.Token(T.Text, "'")
        cnt = 0
        for token in stream:
            cnt += 1
            if token.is_whitespace() and '\n' in token.value:
                if cnt == 1:
                    continue
                after_lb = token.value.split('\n', 1)[1]
                yield sql.Token(T.Text, " '")
                yield sql.Token(T.Whitespace, '\n')
                for i in range(len(varname) + 4):
                    yield sql.Token(T.Whitespace, ' ')
                yield sql.Token(T.Text, "'")
                if after_lb:  # it's the indendation
                    yield sql.Token(T.Whitespace, after_lb)
                continue
            elif token.value and "'" in token.value:
                token.value = token.value.replace("'", "\\'")
            yield sql.Token(T.Text, token.value or '')
        yield sql.Token(T.Text, "'")
        if has_nl:
            yield sql.Token(T.Operator, ')')

def nl(self, offset=0):
        return sql.Token(
            T.Whitespace,
            self.n + self.char * max(0, self.leading_ws + offset))

def nl(self, offset=1):
        # offset = 1 represent a single space after SELECT
        offset = -len(offset) if not isinstance(offset, int) else offset
        # add two for the space and parens
        indent = self.indent * (2 + self._max_kwd_len)

        return sql.Token(T.Whitespace, self.n + self.char * (
            self._max_kwd_len + offset + indent + self.offset))

if self.comma_first:
                            _, ws = tlist.token_next(
                                tlist.token_index(token), skip_ws=False)
                            if (ws is not None
                                    and ws.ttype is not T.Text.Whitespace):
                                tlist.insert_after(
                                    token, sql.Token(T.Whitespace, ' '))
                        position = 0
        else:
            # ensure whitespace
            for token in tlist:
                _, next_ws = tlist.token_next(
                    tlist.token_index(token), skip_ws=False)
                if token.value == ',' and not next_ws.is_whitespace:
                    tlist.insert_after(
                        token, sql.Token(T.Whitespace, ' '))

            end_at = self.offset + sum(len(i.value) + 1 for i in identifiers)
            adjusted_offset = 0
            if (self.wrap_after > 0
                    and end_at > (self.wrap_after - self.offset)
                    and self._last_func):
                adjusted_offset = -len(self._last_func.value) - 1

            with offset(self, adjusted_offset), indent(self):
                if adjusted_offset < 0:
                    tlist.insert_before(identifiers[0], self.nl())
                position = 0
                for token in identifiers:
                    # Add 1 for the "," separator
                    position += len(token.value) + 1
                    if (self.wrap_after > 0

def get_alias(self):
        """Returns the alias for this identifier or ``None``."""

        # "name AS alias"
        kw_idx, kw = self.token_next_by(m=(T.Keyword, 'AS'))
        if kw is not None:
            return self._get_first_name(kw_idx + 1, keywords=True)

        # "name alias" or "complicated column expression alias"
        _, ws = self.token_next_by(t=T.Whitespace)
        if len(self.tokens) > 2 and ws is not None:
            return self._get_first_name(reverse=True)

def process(self, stack, stream):
        splitlevel = 0
        stmt = None
        consume_ws = False
        stmt_tokens = []
        for ttype, value in stream:
            # Before appending the token
            if (consume_ws and ttype is not T.Whitespace
                and ttype is not T.Comment.Single):
                consume_ws = False
                stmt.tokens = stmt_tokens
                yield stmt
                self._reset()
                stmt = None
                splitlevel = 0
            if stmt is None:
                stmt = Statement()
                stmt_tokens = []
            splitlevel += self._change_splitlevel(ttype, value)
            # Append the token
            stmt_tokens.append(Token(ttype, value))
            # After appending the token
            if (splitlevel <= 0 and ttype is T.Punctuation
                and value == ';'):

def get_alias(self):
        """Returns the alias for this identifier or ``None``."""

        # "name AS alias"
        kw_idx, kw = self.token_next_by(m=(T.Keyword, 'AS'))
        if kw is not None:
            return self._get_first_name(kw_idx + 1, keywords=True)

        # "name alias" or "complicated column expression alias"
        _, ws = self.token_next_by(t=T.Whitespace)
        if len(self.tokens) > 2 and ws is not None:
            return self._get_first_name(reverse=True)

def strip_whitespace(self, tokenlist) :
        #print tokenlist
        newlist = []
        for token in tokenlist.tokens :
            if token.ttype == sqlparse.tokens.Whitespace :
                pass
            else :
                newlist.append(token)
        return newlist
    ## End strip_whitespace()