Python如何从字符串中提取uptime命令输出的指定字段

你不需要把整个原始输出转为字典——原始输出混杂了文件列表、命令提示符、执行时间提示等无关内容，本身不是标准的序列化字典格式，直接转换必然失败。针对固定格式的命令输出，用分段截取+键值对匹配的方式提取即可，步骤如下：

• 先将捕获到的bytes类型返回值解码为普通字符串
• 定位到uptime命令对应的输出块，过滤无关内容
• 逐行拆分冒号分隔的键值对，存入结构化字典

可直接运行的代码示例 #

import re

# raw_output 替换为你实际捕获到的shell返回bytes值
raw_output = b"""  adjDisc/, adjprov/, ains/, alarm/, alatypes/, almBase/, ALPL/, alrmst, ALSO/, 
  applblki/, aTrace/, BackPlane/, baseUtils/, brownout/, bwm/, cac/, cdb/, 
  chkpt/, CLAF/, clustering/, cmnfpga/, comms/, config/, configFile/, control/, 
  cpl, cplutils/, create_file, csclient/, dasm_cfm/, datasync/, dbalrms/, 
  dbman/, dbrst/, ddf/, decommission/, diag/, difReasons, doc/, dov/, ds1tm/, 
  dsbl/, edf, ehf/, epl/, EqptAttr/, eqptgrp/, eqpt_mode/, eqpt_stats/, 
  eslots/, fhgraph/, filesync/, flashBurn/, flightrec/, fpo/, fsm/, ftp/, 
  ftpClient/, gzip/, hal/, hdsmlinkdata/, heapStats, httpc/, i2c/, imon/, ins/, 
  intDiag/, intrrpts/, ipc/, ipm/, irq1/, irq2/, IRQ6/, isc/, l2Services/, 
  leds/, loadinfo/, loadMgmt/, logs/, lua/, manufacturing/, memStats, 
  misconnection/, mmon/, mofshadow/, nbi_common_utils/, necht/, niapp/, nlc/, 
  nncli/, oamfac/, obm/, observer/, opmCtrl/, opmCtrlFlex/, OSRP/, otdr/, 
  owireci/, passive_slots/, pathopt/, pbe/, pdns/, PhotonicNBI/, 
  photonicsNVSRecovery/, photonic_ots/, photop/, plog/, PM/, pm/, pmbase/, 
  pmp/, pods/, powerAudit/, pramUtil/, ras/, RASDBGI, rdbg, rmcemon/, 
  round_trip_delay/, rpr/, rtrvlog/, sbf/, scmpml/, secure_erase_cmn/, 
  setpriv, shelfinfo/, shelfSync/, slc/, slotseq/, snmp/, SNMPTranslator/, 
  socKernel/, socLa/, SONMP/, sorn/, sov/, spfpga/, spsid_dump, 
  SpSwSubFailReason, spsync/, sptools/, svrest/, sync/, tar/, targetshell/, 
  tcsdebug/, tdrf/, tdrfShow, teas/, telnet/, tidci/, tl1ci/, TL1EvtSeq/, 
  tl1_to_avp/, tod/, top/, tpUtl/, tr/, trace/, tracepoints/, TRCntrl/, 
  ts1forn/, tsam/, tsbase/, tsds3ec1/, tsemotr/, tsexer/, tsfpo/, tsl2/, 
  tsmdd_qry/, tsm_prov/, tsm_sbf/, tsngm/, tsocn/, tsotnsw/, tsplug/, tsprot/, 
  tsprsta/, tssmux/, tsstm1ee4/, tsxc_sbf/, ts_allocation/, ud2_fwd/, udp_fwd/, 
  upgrade/, uptime, vbus/, vfs/, vfs_signal_debug/, vkgcct/, vkgfan/, vkginv/, 
  vkgio/, vkgpwr/, vk_i2c_acc/, vneProxy/, vosa/, *=quit

TID="Sub_6500_3":Shelf=1
Slot15-docInst: unset, ome_sp2_vx_appl: OME1280.BP
Command completed at TUE JUN 07, 2022 - 04:58:42 (UTC)

----> ~ uptime 
Last restart occurred at: FRI MAY 27, 2022 at 07:42:31 (UTC) 
Time since restart: 10 days 21 hrs 16 mins 13 secs

Actual Cumulative uptime: 489 days 7 hrs 30 mins
Logged Cumulative uptime: 488 days 11 hrs 54 mins

Actual Continuous uptime: 118 days 15 hrs 47 mins

Command completed at TUE JUN 07, 2022 - 04:58:44 (UTC)

----> """

# 解码bytes为字符串
output_text = raw_output.decode("utf-8").strip()

# 正则截取uptime命令的有效输出区间
uptime_segment = re.search(
    r"----> ~ uptime\s*(.*?)\s*Command completed at",
    output_text,
    re.S
).group(1)

# 逐行提取键值对
uptime_data = {}
for line in uptime_segment.splitlines():
    line = line.strip()
    if not line:
        continue
    # 按第一个冒号拆分键和值，避免值内容里的冒号导致拆分错误
    key, val = line.split(":", 1)
    uptime_data[key.strip()] = val.strip()

提取结果说明 #

执行代码后得到的uptime_data字典会包含所有目标字段：

• Last restart occurred at：设备上次重启时间，示例值为FRI MAY 27, 2022 at 07:42:31 (UTC)
• Time since restart：上次重启到当前的运行时长，示例值为10 days 21 hrs 16 mins 13 secs
• Actual Cumulative uptime：设备实际累计运行时长，示例值为489 days 7 hrs 30 mins
• Logged Cumulative uptime：系统记录的累计运行时长，示例值为488 days 11 hrs 54 mins
• Actual Continuous uptime：设备实际连续运行时长，示例值为118 days 15 hrs 47 mins

如果后续设备输出格式有微调，只需要修改正则匹配的区间规则即可，不需要改动核心的键值对提取逻辑。

内容的提问来源于stack exchange，提问作者HSHEKHAR