import tokenize
from io import BytesIO
from collections import deque
code_string = r"""
class Bar(object):
  def __init__(self):
    a = \
1
    b = 2
""".strip()
file = BytesIO(code_string.encode())
tokens = deque(tokenize.tokenize(file.readline))
lines = []
while tokens:
    token = tokens.popleft()
    if token.type == tokenize.NAME and token.string == 'def':
        start_line, start_column = token.start
        end_line, _ = token.end
        enclosures = 0
        while tokens:
            token = tokens.popleft()
            if token.type == tokenize.NL: # ignore empty lines
                continue
            if token.type == tokenize.OP and token.string in '([{':
                enclosures += 1
            _, column = token.start
            if column <= start_column and token.type != tokenize.INDENT and not enclosures:
                tokens.appendleft(token)
                break
            if token.type == tokenize.OP and token.string in ')]}':
                enclosures -= 1
            end_line, _ = token.end
        lines.append((start_line, end_line))
print(lines)

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