将stdout重定向到Python中的文本文件？

Question

我想将输出的打印语句重定向到文本文件。 我已经导入了sys并在下面尝试过。

import pprint
import os
import math
import sys

class ExportLimits(object):
    MMAP_ITER_TRIPS = 'manpower_mappings.map_iterator_trips'

def __init__(self, workset, crew_type, bid_period, divisor_files=None):
    log_file = "/opt/test/test_user/data/ESR_DATA/etab/slogfile.txt"
    sys.stdout = open(log_file, 'w')
    self.workset = workset
    self.crew_type = crew_type
    self.bid_period = bid_period
    self.tm = workset.getTM()
    self.crew_bid_period = self.crew_type + "+" + self.bid_period
    self.bid_period = self.tm.table('qf_user_bid_period')[(self.crew_bid_period)]
    self.period = Period(self.bid_period.bpstart, self.bid_period.bpend)
    self.filter_matcher = self._get_filter_matcher()
    self.iterator_trips = rave_api.eval(\
            ExportLimits.MMAP_ITER_TRIPS)[0]
    self.divisor_reader_lh = divisor_reader_lh.DivisorReader(\
            divisor_files=divisor_files)
    self.divisor_reader_sh = divisor_reader_sh.DivisorReader(\
            divisor_files=divisor_files)
    self.pp_start = self.period.getStart()
    self.pp_end = self.period.getEnd()

def export_limits(self, item_type):
    if item_type == 'DKSH':
       self._mandays_limits(SLKHH_GROUPS)
    else:
       self._mandays_limits(LAJSDLH_GROUPS)
def _mandays_limits(self, groups):
  crews = [self.tm.table('crew')[('99172447',)],
             self.tm.table('crew')[('7654678',)]]
  generator = ((crew, self.filter_matcher.getFilterNamePeriodsMap(crew.id))
                 for crew in self.tm.table('crew'))

  minres = defaultdict(lambda :RelTime(0))
  maxres = defaultdict(lambda :RelTime(0))

  for crew, group_to_periods in generator:
      print crew, group_to_periods
      try:
         crew_filter, period = group_to_periods.iteritems().next()
      except StopIteration:
         continue
      if crew_filter not in groups:
         continue

它对我有用。 我可以打印几行，但不能完全打印。 请在我的日志文件的以下输出中找到，该输出仅打印了较少的行，但没有打印完整的日志。 由于某种原因，它没有完全打印出来。 （请参阅日志文件的最后一行，该行仅打印到“ alia”为止。）

日志文件：

乘员组_id =“ 133245” id =“ 176543” empno =“ 8761890” sex =“ M” Birthday =“ 19681217” name =“ MICHEAL” forenames =“ LUCAS” maincat =“ C” preferredname =“ ESWAR”首字母=“ LL “ joindate =” 20010910 00:00“ comjoindate =” 20010910 00:00“ _void =”标题，登录名，si，bcity，bstate，bcountry，alias，comenddate“ {'X-SYD-BB-AUSLLH'：[26JUN2017 00 ：00-21AUG2017 00:00]}

乘员组_id =“ 214141” id =“ 132451” empno =“ 145432” sex =“ M” Birthday =“ 19630904” name =“ ESWARF” forenames =“ FJDJSK” maincat =“ C” preferredname =“ ESWADF”首字母=“ WL “ joindate =” 20010910 00:00“ comjoindate =” 20010910 00:00“ _void =”标题，登录名，si，bcity，bstate，国家，别名

〜
〜

请检查并告知。

Answer 1

不用sys.stdout，您可以这样写：

output_file = open(log_file, 'w')

output_file.write('testing asdasdfsd')

或者，如果您想在日志文件中写入各种打印值，则：

output_file =打开（log_file，'w'）

sys.stdout =输出文件

而已。