Coverage for Lib/asyncio/base_futures.py: 94%

1__all__ = () 

2 

3import reprlib 

4 

5from . import format_helpers 

6 

7# States for Future. 

8_PENDING = 'PENDING' 

9_CANCELLED = 'CANCELLED' 

10_FINISHED = 'FINISHED' 

11 

12 

13def isfuture(obj): 

14 """Check for a Future. 

15 

16 This returns True when obj is a Future instance or is advertising 

17 itself as duck-type compatible by setting _asyncio_future_blocking. 

18 See comment in Future for more details. 

19 """ 

20 return (hasattr(obj.__class__, '_asyncio_future_blocking') and 

21 obj._asyncio_future_blocking is not None) 

22 

23 

24def _format_callbacks(cb): 

25 """helper function for Future.__repr__""" 

26 size = len(cb) 

27 if not size: 27 ↛ 28line 27 didn't jump to line 28 because the condition on line 27 was never true

28 cb = '' 

29 

30 def format_cb(callback): 

31 return format_helpers._format_callback_source(callback, ()) 

32 

33 if size == 1: 

34 cb = format_cb(cb[0][0]) 

35 elif size == 2: 

36 cb = '{}, {}'.format(format_cb(cb[0][0]), format_cb(cb[1][0])) 

37 elif size > 2: 37 ↛ 41line 37 didn't jump to line 41 because the condition on line 37 was always true

38 cb = '{}, <{} more>, {}'.format(format_cb(cb[0][0]), 

39 size - 2, 

40 format_cb(cb[-1][0])) 

41 return f'cb=[{cb}]' 

42 

43 

44def _future_repr_info(future): 

45 # (Future) -> str 

46 """helper function for Future.__repr__""" 

47 info = [future._state.lower()] 

48 if future._state == _FINISHED: 

49 if future._exception is not None: 

50 info.append(f'exception={future._exception!r}') 

51 else: 

52 # use reprlib to limit the length of the output, especially 

53 # for very long strings 

54 result = reprlib.repr(future._result) 

55 info.append(f'result={result}') 

56 if future._callbacks: 

57 info.append(_format_callbacks(future._callbacks)) 

58 if future._source_traceback: 

59 frame = future._source_traceback[-1] 

60 info.append(f'created at {frame[0]}:{frame[1]}') 

61 return info 

62 

63 

64@reprlib.recursive_repr() 

65def _future_repr(future): 

66 info = ' '.join(_future_repr_info(future)) 

67 return f'<{future.__class__.__name__} {info}>'