Python dateutil 规则错误

Question

我在下面的示例代码中收到以下错误。我不确定导致错误的原因或原因，因为此代码过去运行良好。我正在使用 Python 2.7

AttributeError: 'module' object has no attribute 'allocate_lock'

这是一个包含问题的最小示例。

import pandas as pd
import pytz

from datetime import datetime, timedelta
from dateutil import rrule

start = pd.Timestamp('1900-01-01', tz='UTC')
end_base = pd.Timestamp('today', tz='UTC')
end = end_base + timedelta(days=365)

def canonicalize_datetime(dt):
    return datetime(dt.year, dt.month, dt.day, tzinfo=pytz.utc)

def get_rules(start, end):
    rules = []

    start = canonicalize_datetime(start)
    end = canonicalize_datetime(end)

    weekends = rrule.rrule(
        rrule.YEARLY,
        byweekday=(rrule.SA, rrule.SU),
        cache=True,
        dtstart=start,
        until=end
    )
    rules.append(weekends)

    return rules

rules = get_rules(start, end)

完整的追溯

Traceback (most recent call last):
  File "/Users/mac/Documents/test.py", line 48, in <module>
    rules = get_rules(start, end)
  File "/Users/mac/Documents/test.py", line 42, in get_rules
    until=end
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/dateutil/rrule.py", line 239, in __init__
    super(rrule, self).__init__(cache)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/dateutil/rrule.py", line 90, in __init__
    self._cache_lock = _thread.allocate_lock()
AttributeError: 'module' object has no attribute 'allocate_lock'

根据 dateutil 源代码和用户@PatrickCollins ，问题可以产生

import _thread

_thread.allocate_lock()

Answer 1

经过进一步调查，问题似乎出在 pip 上。安装不正确的版本。通过安装 datetuil-1.5 解决了这个问题。

python-dateutil-2.0.tar.gz (Python >= 3.0)

python-dateutil-1.5.tar.gz (Python < 3.0)

然而，这可能会引发更多问题，即为什么 dateutil 2.2 版适用于其他使用 python 2.7 的人