Name error with regular expression

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I am trying to parse the a file content with regular expression as in the code below. If I print the system name inside 'IF' suite, it works. But If I try to do anywhere outside, its throwing name error. Any help would be really appreciated.

#!/usr/bin/python
import re
f=open("cdp-nei1.txt")
f=f.readlines()

for data in f:
    cdp_line = data.split("\n")
    for line in cdp_line:
        if "System Name" in line:
            systemname = re.search(r"System Name:(.+)",line)
            systemname =  systemname.group(1)
            print systemname

---

./show-cdp.py

Router1

---

#!/usr/bin/python
import re
f=open("cdp-nei1.txt")
f=f.readlines()

for data in f:
    cdp_line = data.split("\n")
    for line in cdp_line:
        if "System Name" in line:
            systemname = re.search(r"System Name:(.+)",line)
            systemname =  systemname.group(1)
        print systemname

***

 ./show-cdp.py 

Traceback (most recent call last):
  File "./show-cdp.py", line 12, in <module>
    print systemname
NameError: name 'systemname' is not defined

---

File Content (Truncated to show only one block)

---

Device ID:Router1
System Name: Router1

Interface address(es):
    IPv4 Address: 10.0.0.1
Platform: N5K-C5672UP, Capabilities: Router Switch IGMP Filtering Supports-STP-Dispute
Interface: mgmt0, Port ID (outgoing port): Ethernet101/1/47
Holdtime: 179 sec

Version:
Cisco Nexus Operating System (NX-OS) Software, Version 7.0(1)N1(1)

Advertisement Version: 2

Native VLAN: 1
Duplex: full

MTU: 1500
Physical Location: Somewhere,United States
Mgmt address(es):
    IPv4 Address: 10.0.0.1

asked 1 min ago

deepa

1

Name error with regular expression