如何从文本文件中的"sh run“输出获取接口级配置

Question

有人能帮我从cisco路由器/交换机配置的"sh run“输出文本文件中只获取接口配置吗？

if not os.path.exists(Destpath):
        os.makedirs(Destpath)
        

    #time.sleep(10)

    File_SList=os.listdir(sourcepath)
    print(File_SList)

    interface_pattern=re.compile(r'(interface \S+)|( ip helper-address [\d.]+)')

    Number_File=0
    for X in File_SList:
      SpFile=X
      DFile=X
      print()
      print(SpFile)
      Number_File+=1
     
      with open(os.path.join(sourcepath,SpFile),"r") as file :
          
        Output=file.readlines()
        print("Check")
        
        helper_list=[]
               
        with open(os.path.join(Destpath,DFile),"a") as put : 

            for key in Output:
                      
               key=key.lower()
               if "interface" in key :
                    interface_name=key
                    print(key)
                    for key in Output:
                        if "!" not in key:
                            helper_list.append(key)
                        else :
                            break
                        for i in range(len(helper_list)) :
                            put.write(helper_list[i])
                    
                        helper_list=[]

从网络交换机的以下共享"sh run“输出，我们如何复制只与接口相关的配置(接口端口-通道1、接口GigabitEthernet1 0/0、接口FastEthernet1 1/0/1、接口FastEthernet1 1/0/2、接口GigabitEthernet1 1/0/1.)然后把它保存到另一个文件。

#
service tcp-keepalives-in
service tcp-keepalives-out
service timestamps debug datetime msec localtime show-timezone
service timestamps log datetime msec localtime show-timezone
service password-encryption
service sequence-numbers
service call-home
platform punt-keepalive disable-kernel-core
!
hostname Switch01
!
!
vrf definition Mgmt-vrf
 !
 address-family ipv4
 exit-address-family
 !
 address-family ipv6
 exit-address-family
!
logging userinfo
logging buffered 20000
!
stack-mac persistent timer 0
boot system bootflash:packages.conf
boot system flash:packages.conf
power redundancy-mode combined
power supply autoLC shutdown
power supply autoLC priority 1 2 5 6 7
!
ip arp gratuitous local
no ip gratuitous-arps
!
ip icmp rate-limit unreachable DF 200
no ip domain lookup
ip dhcp bootp ignore
!
no ip igmp snooping
login block-for 120 attempts 12 within 120
login quiet-mode access-class 109
login on-failure log
login on-success log
!
interface Port-channel1
 description  Po1
 switchport trunk native vlan 998
 switchport trunk allowed vlan 10-12,20,100-107,110,301-401,556,601,602,691
 switchport trunk allowed vlan add 701-706,710,800,998,999
 switchport mode trunk
!
interface Port-channel2
 description Core Po2
 switchport trunk native vlan 999
 switchport trunk allowed vlan 10-12,20,100-106,110,301-306,401,601,602,691
 switchport trunk allowed vlan add 701-706,710,800,998,999
 switchport mode trunk
!
interface GigabitEthernet0/0
 vrf forwarding Mgmt-vrf
 no ip address
 shutdown
 negotiation auto
!
interface GigabitEthernet1/0/1
 description VEDGE_1_UPLINK
 switchport access vlan 901
 switchport mode access
 spanning-tree portfast
 spanning-tree bpduguard enable
 service-policy output QOS-OUTPUT-POLICY
!
interface FastEthernet1/0/1
 description **Connected to PC**
 switchport access vlan 111
 switchport mode access
 switchport port-security aging time 2
 no logging event link-status
 speed 100
 duplex full
 priority-queue out
 mls qos trust dscp
 no snmp trap link-status
 no cdp enable
 spanning-tree portfast
 hold-queue 120 in
 hold-queue 200 out
 ip dhcp snooping trust
!
interface FastEthernet1/0/2
 description **Connected to Access Point****
 switchport access vlan 900
 switchport mode access
 switchport port-security maximum 15
 switchport port-security
 switchport port-security aging time 2
 switchport port-security aging type inactivity
 ip access-group 100 in
 no logging event link-status
 srr-queue bandwidth shape 0 0 0 10
 queue-set 2

!

 priority-queue out
 no snmp trap link-status
 storm-control broadcast level pps 100 50
 storm-control multicast level pps 100 50
 storm-control action trap
 spanning-tree portfast
 spanning-tree bpduguard enable
 service-policy input WIRELESS_IN
 ip dhcp snooping limit rate 15

Answer 1

以下是一个适合您的解决方案：

import os

sourcepath = "/your/path"
Destpath = "/your/other/path"

if not os.path.exists(Destpath):
    os.makedirs(Destpath)

# The code below has been unindented: otherwise this code will run only when Despath
# does not exist!

File_SList = os.listdir(sourcepath)
print(File_SList)

for X in File_SList:
    SpFile = X
    DFile = X
    print()
    print(SpFile)

    with open(os.path.join(sourcepath, SpFile), "r") as file:
        Output = file.readlines()
        print("Check")

    helper_list = []

    # Use 'w' to write, not 'a' to append because you would end up with the whole content
    # of your original file plus your custom extraction below in that same file.
    # I also unindented this `with` statement to make your code more readable.
    with open(os.path.join(Destpath, DFile), "w") as put:
        found_interface = False

        # Loop only once through the file!
        # (Notice there is no other `for key in Output` loop below)
        for key in Output:
            # Check if we have a start for a match, we assume no match by default
            if found_interface is False:
                key_lower = key.lower()
                if "interface" in key_lower:
                    interface_name = key
                    print(key)
                    found_interface = True

                    # If you want to keep the interface in lowercase, use `key_lower`
                    helper_list.append(key)
                # Important: while you are looping through each line, you do not want
                # to check for the end of a match (`!`) until you are effectively inside
                # an `interface` block, so don't run the rest of the logic in this loop
                continue

            # When `found_interface` is True, we know we want to capture any line until
            # we get an exclamation point
            if "!" not in key:
                helper_list.append(key)
            else:
                # Here, we have reached the end of the `interface` block. There is no
                # need to use range(len(...)), I have simplified your statement a bit.
                for line in helper_list:
                    put.write(line)

                helper_list = []
                found_interface = False

我在注释中指出了对代码所做的一些更改(并删除了与清晰度无关的内容)，但最重要的是，主要的逻辑错误位于第二个for循环中：

for key in Output:
    if "!" not in key:

想法很清楚:只要您没有遇到一个interface块，就可以在每个!块内循环。但是，这意味着代码将不止一次地查看每一行，这将很快变得混乱！一个更好的方法是只循环一次文件的每一行，并跟踪您所在的位置。

换句话说，在这种方法中，标记匹配(interface)，并一直追加一行直到找到不想要的东西(!)。在这一点上，您“取消”您的匹配，以便您不再附加行。对于随后的每一行，您将检查是否正在启动一个新的interface块。

希望这能有所帮助！干杯，欢迎！