Python 如何在不进入 For 循环的情况下检查下一个 iter 项
How to check next iter item without proceeding in For loop in Python
当通过 next(iter) 进行迭代时，我想基本上将网络组合在一起，我通过计算每一行中出现的项目数来做到这一点，如果它有 7 个项目，它就是一个条目的开始。
然后我在输入行下方查找行，直到找到包含 7 个项目的另一行。然后该过程重新开始。
唯一的问题是当我通过 line = next(bgp_table_iter) 访问 "next line" 并打破循环时，如果 "next line" 有 7 个项目意味着开始一个新条目，当它重新开始时在 for line in bgp_table_iter: 它再次迭代到下一行，跳过原来的 "next line" 应该有 7 个项目并且是新条目的开始。
最后跳过所有其他条目。
如何防止跳过？或者让 For 循环触发器在中断时转到上一次迭代？
def show_ip_bgp():
data = test_output_short.split('RPKI validation codes: V valid, I invalid, N Not found\n\n Network Next Hop Metric LocPrf Weight Path\n')
bgp_table = data[1]
bgp_table = re.sub(" Network Next Hop Metric LocPrf Weight Path\n","",bgp_table)
bgp_table = re.sub("\*","",bgp_table)
bgp_table_list = bgp_table.split('\n')
bgp_table_iter = iter(bgp_table_list)
overall_dict = {}
index = 0
for line in bgp_table_iter:
# print line.split(), len(line.split())
current_line = line.split()
# If 7 items are in the list it's the start of a network
if len(current_line) == 7:
best = True if '>' in current_line[0] else False
network = current_line[1]
attached_ip = current_line[2]
print "Found Starting Network", network, attached_ip, "Best Path: {}".format(best)
for i in range(0,1000):
line = next(bgp_table_iter)
subline_line = line.split()
best_sub = 'True' if '>' in subline_line[0] else 'False'
if len(subline_line) == 6:
print 'Sub:', subline_line[1], "Best Path: {}".format(best_sub)
elif len(subline_line) == 5:
print 'Sub:', subline_line[1], "Best Path: {}".format(best_sub)
elif len(subline_line) == 7:
break
test_output_short = '''BGP table version is 3538854, local router ID is 10.15.1.81
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
* i 10.0.1.0/24 10.8.111.45 0 115 0 i
*>i 10.8.11.45 0 120 0 i
* i 10.8.11.45 0 120 0 i
* i 10.8.11.45 0 120 0 i
* i 10.0.3.0/29 10.8.111.45 0 115 0 i
*>i 10.8.11.45 0 120 0 i
* i 10.8.11.45 0 120 0 i
* i 10.8.11.45 0 120 0 i
* i 10.8.0.0/16 10.9.0.1 0 50 0 i
* i 10.8.0.1 0 50 0 i
*> 0.0.0.0 0 32768 i
* i 10.9.0.0/16 10.9.0.1 0 50 0 i
* i 10.8.0.1 0 50 0 i
*> 0.0.0.0 0 32768 i
*>i 10.10.2.0/24 10.8.10.2 0 100 0 i
* i 10.8.10.2 0 100 0 i
* i 10.8.10.2 0 100 0 i
* i 10.10.5.0/24 10.8.142.15 0 85 0 i
*>i 10.8.42.15 0 100 0 i
* i 10.8.42.15 0 100 0 i
* i 10.8.42.15 0 100 0 i
*>i 10.10.7.0/24 10.8.40.84 0 100 0 i
* i 10.8.40.84 0 100 0 i
* i 10.8.40.84 0 100 0 i
*>i 10.10.8.0/24 10.8.10.8 0 100 0 i
* i 10.8.110.8 0 85 0 i
* i 10.8.10.8 0 100 0 i
* i 10.8.10.8 0 100 0 i
*>i 10.10.11.0/24 10.8.42.8 0 100 0 i
* i 10.8.42.8 0 100 0 i
* i 10.8.42.8 0 100 0 i
* i 10.9.42.8 0 100 0 i
* i 10.10.12.0/24 10.8.10.12 0 100 0 i
* i 10.8.10.12 0 100 0 i
*>i 10.8.10.12 0 100 0 i'''
输出：
>>> show_ip_bgp()
Found Starting Network 10.0.1.0/24 10.8.111.45 Best Path: False
Sub: 10.8.11.45 Best Path: True
Sub: 10.8.11.45 Best Path: False
Sub: 10.8.11.45 Best Path: False
Found Starting Network 10.8.0.0/16 10.9.0.1 Best Path: False
Sub: 10.8.0.1 Best Path: False
Sub: 0.0.0.0 Best Path: True
Found Starting Network 10.10.2.0/24 10.8.10.2 Best Path: True
Sub: 10.8.10.2 Best Path: False
Sub: 10.8.10.2 Best Path: False
Found Starting Network 10.10.7.0/24 10.8.40.84 Best Path: True
Sub: 10.8.40.84 Best Path: False
Sub: 10.8.40.84 Best Path: False
Found Starting Network 10.10.11.0/24 10.8.42.8 Best Path: True
Sub: 10.8.42.8 Best Path: False
Sub: 10.8.42.8 Best Path: False
Sub: 10.9.42.8 Best Path: False
更新：
在我 运行 测试之前，建议的修复似乎有效。它确实使所有网络都显得有点。
def show_ip_bgp():
数据 = test_output_very_short.split('RPKI validation codes: V valid, I invalid, N Not found\n\n Network Next Hop Metric LocPrf Weight Path\n')
bgp_table = 数据[1]
bgp_table = re.sub(" 网络下一跃点度量 LocPrf 权重 Path\n","",bgp_table)
bgp_table = re.sub("*","",bgp_table)
bgp_table_list = bgp_table.split('\n')
bgp_table_iter = iter(bgp_table_list)
overall_dict = {}
index = 0
for i, line in enumerate(bgp_table_list):
# print line.split(), len(line.split())
current_line = line.split()
# If 7 items are in the list it's the start of a network
if len(current_line) == 7:
best = True if '>' in current_line[0] else False
network = current_line[1]
attached_ip = current_line[2]
print "Found Starting Network", network, attached_ip, "Best Path: {}".format(best)
for i in range(0,1000):
line = bgp_table_list[i+1]
print i
subline_line = line.split()
best_sub = 'True' if '>' in subline_line[0] else 'False'
if len(subline_line) == 6:
print 'Sub:', subline_line[1], "Best Path: {}".format(best_sub)
elif len(subline_line) == 5:
print 'Sub:', subline_line[1], "Best Path: {}".format(best_sub)
elif len(subline_line) == 7:
line = bgp_table_list[i+1]
break
输出：
Found Entry Network: 10.0.1.0/24 Nexthop: 10.8.111.45 Best Path: False Pref: 115
0
Found Network: 10.0.1.0/24 Nexthop: 10.8.11.45 Best Path: True Pref: 120
1
Found Network: 10.0.1.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
2
Found Network: 10.0.1.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
3
Found Entry Network: 10.0.3.0/29 Nexthop: 10.8.111.45 Best Path: False Pref: 115
0
Found Network: 10.0.3.0/29 Nexthop: 10.8.11.45 Best Path: True Pref: 120
1
Found Network: 10.0.3.0/29 Nexthop: 10.8.11.45 Best Path: False Pref: 120
2
Found Network: 10.0.3.0/29 Nexthop: 10.8.11.45 Best Path: False Pref: 120
3
Found Entry Network: 10.8.0.0/16 Nexthop: 10.9.0.1 Best Path: False Pref: 50
0
Found Network: 10.8.0.0/16 Nexthop: 10.8.11.45 Best Path: True Pref: 120
1
Found Network: 10.8.0.0/16 Nexthop: 10.8.11.45 Best Path: False Pref: 120
2
Found Network: 10.8.0.0/16 Nexthop: 10.8.11.45 Best Path: False Pref: 120
3
Found Entry Network: 10.9.0.0/16 Nexthop: 10.9.0.1 Best Path: False Pref: 50
0
Found Network: 10.9.0.0/16 Nexthop: 10.8.11.45 Best Path: True Pref: 120
1
Found Network: 10.9.0.0/16 Nexthop: 10.8.11.45 Best Path: False Pref: 120
2
Found Network: 10.9.0.0/16 Nexthop: 10.8.11.45 Best Path: False Pref: 120
3
Found Entry Network: 10.10.2.0/24 Nexthop: 10.8.10.2 Best Path: True Pref: 100
0
Found Network: 10.10.2.0/24 Nexthop: 10.8.11.45 Best Path: True Pref: 120
1
Found Network: 10.10.2.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
2
Found Network: 10.10.2.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
3
Found Entry Network: 10.10.5.0/24 Nexthop: 10.8.142.15 Best Path: False Pref: 85
0
Found Network: 10.10.5.0/24 Nexthop: 10.8.11.45 Best Path: True Pref: 120
1
Found Network: 10.10.5.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
2
Found Network: 10.10.5.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
3
Found Entry Network: 10.10.7.0/24 Nexthop: 10.8.40.84 Best Path: True Pref: 100
0
Found Network: 10.10.7.0/24 Nexthop: 10.8.11.45 Best Path: True Pref: 120
1
Found Network: 10.10.7.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
2
Found Network: 10.10.7.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
3
Found Entry Network: 10.10.8.0/24 Nexthop: 10.8.10.8 Best Path: True Pref: 100
0
Found Network: 10.10.8.0/24 Nexthop: 10.8.11.45 Best Path: True Pref: 120
1
Found Network: 10.10.8.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
2
Found Network: 10.10.8.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
3
Found Entry Network: 10.10.11.0/24 Nexthop: 10.8.42.8 Best Path: True Pref: 100
0
Found Network: 10.10.11.0/24 Nexthop: 10.8.11.45 Best Path: True Pref: 120
1
Found Network: 10.10.11.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
2
Found Network: 10.10.11.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
3
Found Entry Network: 10.10.12.0/24 Nexthop: 10.8.10.12 Best Path: False Pref: 100
0
Found Network: 10.10.12.0/24 Nexthop: 10.8.11.45 Best Path: True Pref: 120
1
Found Network: 10.10.12.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
2
Found Network: 10.10.12.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
3
Found Entry Network: 10.10.15.0/24 Nexthop: 10.8.10.15 Best Path: False Pref: 100
0
Found Network: 10.10.15.0/24 Nexthop: 10.8.11.45 Best Path: True Pref: 120
1
Found Network: 10.10.15.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
2
Found Network: 10.10.15.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
3
Found Entry Network: 10.10.27.0/24 Nexthop: 10.8.41.81 Best Path: False Pref: 100
0
Found Network: 10.10.27.0/24 Nexthop: 10.8.11.45 Best Path: True Pref: 120
1
Found Network: 10.10.27.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
2
Found Network: 10.10.27.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
3
索引号每次都回到 0 show here 打印出正在检查的行的索引。
不要强迫它成为 iter，而是继续将其用作 list，然后使用 enumerate 来了解您在 list 中的位置。
编辑：更改第一个枚举以使用 index，第二个循环的范围以 1 而不是 0 开始，并且行检查到 line = bgp_table_list[index+i]当它到达文件末尾时的 except 子句。
for index, line in enumerate(bgp_table_list):
# print line.split(), len(line.split())
current_line = line.split()
# If 7 items are in the list it's the start of a network
if len(current_line) == 7:
best = True if '>' in current_line[0] else False
network = current_line[1]
attached_ip = current_line[2]
print "Found Starting Network", network, attached_ip, "Best Path: {}".format(best)
for i in range(1, 1000):
try:
line = bgp_table_list[index+i]
except IndexError:
break
subline_line = line.split()
best_sub = 'True' if '>' in subline_line[0] else 'False'
if len(subline_line) == 6:
print 'Sub:', subline_line[1], "Best Path: {}".format(best_sub)
elif len(subline_line) == 5:
print 'Sub:', subline_line[1], "Best Path: {}".format(best_sub)
elif len(subline_line) == 7:
break
我的输出（不知道对不对，提供给大家判断）
Found Starting Network 10.0.1.0/24 10.8.111.45 Best Path: False
Sub: 10.8.11.45 Best Path: True
Sub: 10.8.11.45 Best Path: False
Sub: 10.8.11.45 Best Path: False
Found Starting Network 10.0.3.0/29 10.8.111.45 Best Path: False
Sub: 10.8.11.45 Best Path: True
Sub: 10.8.11.45 Best Path: False
Sub: 10.8.11.45 Best Path: False
Found Starting Network 10.8.0.0/16 10.9.0.1 Best Path: False
Sub: 10.8.0.1 Best Path: False
Sub: 0.0.0.0 Best Path: True
Found Starting Network 10.9.0.0/16 10.9.0.1 Best Path: False
Sub: 10.8.0.1 Best Path: False
Sub: 0.0.0.0 Best Path: True
Found Starting Network 10.10.2.0/24 10.8.10.2 Best Path: True
Sub: 10.8.10.2 Best Path: False
Sub: 10.8.10.2 Best Path: False
Found Starting Network 10.10.5.0/24 10.8.142.15 Best Path: False
Sub: 10.8.42.15 Best Path: True
Sub: 10.8.42.15 Best Path: False
Sub: 10.8.42.15 Best Path: False
Found Starting Network 10.10.7.0/24 10.8.40.84 Best Path: True
Sub: 10.8.40.84 Best Path: False
Sub: 10.8.40.84 Best Path: False
Found Starting Network 10.10.8.0/24 10.8.10.8 Best Path: True
Sub: 10.8.110.8 Best Path: False
Sub: 10.8.10.8 Best Path: False
Sub: 10.8.10.8 Best Path: False
Found Starting Network 10.10.11.0/24 10.8.42.8 Best Path: True
Sub: 10.8.42.8 Best Path: False
Sub: 10.8.42.8 Best Path: False
Sub: 10.9.42.8 Best Path: False
Found Starting Network 10.10.12.0/24 10.8.10.12 Best Path: False
Sub: 10.8.10.12 Best Path: False
Sub: 10.8.10.12 Best Path: True
当通过 next(iter) 进行迭代时，我想基本上将网络组合在一起，我通过计算每一行中出现的项目数来做到这一点，如果它有 7 个项目，它就是一个条目的开始。
然后我在输入行下方查找行，直到找到包含 7 个项目的另一行。然后该过程重新开始。
唯一的问题是当我通过 line = next(bgp_table_iter) 访问 "next line" 并打破循环时，如果 "next line" 有 7 个项目意味着开始一个新条目，当它重新开始时在 for line in bgp_table_iter: 它再次迭代到下一行，跳过原来的 "next line" 应该有 7 个项目并且是新条目的开始。
最后跳过所有其他条目。
如何防止跳过？或者让 For 循环触发器在中断时转到上一次迭代？
def show_ip_bgp():
data = test_output_short.split('RPKI validation codes: V valid, I invalid, N Not found\n\n Network Next Hop Metric LocPrf Weight Path\n')
bgp_table = data[1]
bgp_table = re.sub(" Network Next Hop Metric LocPrf Weight Path\n","",bgp_table)
bgp_table = re.sub("\*","",bgp_table)
bgp_table_list = bgp_table.split('\n')
bgp_table_iter = iter(bgp_table_list)
overall_dict = {}
index = 0
for line in bgp_table_iter:
# print line.split(), len(line.split())
current_line = line.split()
# If 7 items are in the list it's the start of a network
if len(current_line) == 7:
best = True if '>' in current_line[0] else False
network = current_line[1]
attached_ip = current_line[2]
print "Found Starting Network", network, attached_ip, "Best Path: {}".format(best)
for i in range(0,1000):
line = next(bgp_table_iter)
subline_line = line.split()
best_sub = 'True' if '>' in subline_line[0] else 'False'
if len(subline_line) == 6:
print 'Sub:', subline_line[1], "Best Path: {}".format(best_sub)
elif len(subline_line) == 5:
print 'Sub:', subline_line[1], "Best Path: {}".format(best_sub)
elif len(subline_line) == 7:
break
test_output_short = '''BGP table version is 3538854, local router ID is 10.15.1.81
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
* i 10.0.1.0/24 10.8.111.45 0 115 0 i
*>i 10.8.11.45 0 120 0 i
* i 10.8.11.45 0 120 0 i
* i 10.8.11.45 0 120 0 i
* i 10.0.3.0/29 10.8.111.45 0 115 0 i
*>i 10.8.11.45 0 120 0 i
* i 10.8.11.45 0 120 0 i
* i 10.8.11.45 0 120 0 i
* i 10.8.0.0/16 10.9.0.1 0 50 0 i
* i 10.8.0.1 0 50 0 i
*> 0.0.0.0 0 32768 i
* i 10.9.0.0/16 10.9.0.1 0 50 0 i
* i 10.8.0.1 0 50 0 i
*> 0.0.0.0 0 32768 i
*>i 10.10.2.0/24 10.8.10.2 0 100 0 i
* i 10.8.10.2 0 100 0 i
* i 10.8.10.2 0 100 0 i
* i 10.10.5.0/24 10.8.142.15 0 85 0 i
*>i 10.8.42.15 0 100 0 i
* i 10.8.42.15 0 100 0 i
* i 10.8.42.15 0 100 0 i
*>i 10.10.7.0/24 10.8.40.84 0 100 0 i
* i 10.8.40.84 0 100 0 i
* i 10.8.40.84 0 100 0 i
*>i 10.10.8.0/24 10.8.10.8 0 100 0 i
* i 10.8.110.8 0 85 0 i
* i 10.8.10.8 0 100 0 i
* i 10.8.10.8 0 100 0 i
*>i 10.10.11.0/24 10.8.42.8 0 100 0 i
* i 10.8.42.8 0 100 0 i
* i 10.8.42.8 0 100 0 i
* i 10.9.42.8 0 100 0 i
* i 10.10.12.0/24 10.8.10.12 0 100 0 i
* i 10.8.10.12 0 100 0 i
*>i 10.8.10.12 0 100 0 i'''
输出：
>>> show_ip_bgp()
Found Starting Network 10.0.1.0/24 10.8.111.45 Best Path: False
Sub: 10.8.11.45 Best Path: True
Sub: 10.8.11.45 Best Path: False
Sub: 10.8.11.45 Best Path: False
Found Starting Network 10.8.0.0/16 10.9.0.1 Best Path: False
Sub: 10.8.0.1 Best Path: False
Sub: 0.0.0.0 Best Path: True
Found Starting Network 10.10.2.0/24 10.8.10.2 Best Path: True
Sub: 10.8.10.2 Best Path: False
Sub: 10.8.10.2 Best Path: False
Found Starting Network 10.10.7.0/24 10.8.40.84 Best Path: True
Sub: 10.8.40.84 Best Path: False
Sub: 10.8.40.84 Best Path: False
Found Starting Network 10.10.11.0/24 10.8.42.8 Best Path: True
Sub: 10.8.42.8 Best Path: False
Sub: 10.8.42.8 Best Path: False
Sub: 10.9.42.8 Best Path: False
更新：
在我 运行 测试之前，建议的修复似乎有效。它确实使所有网络都显得有点。
def show_ip_bgp(): 数据 = test_output_very_short.split('RPKI validation codes: V valid, I invalid, N Not found\n\n Network Next Hop Metric LocPrf Weight Path\n') bgp_table = 数据[1] bgp_table = re.sub(" 网络下一跃点度量 LocPrf 权重 Path\n","",bgp_table) bgp_table = re.sub("*","",bgp_table)
bgp_table_list = bgp_table.split('\n')
bgp_table_iter = iter(bgp_table_list)
overall_dict = {}
index = 0
for i, line in enumerate(bgp_table_list):
# print line.split(), len(line.split())
current_line = line.split()
# If 7 items are in the list it's the start of a network
if len(current_line) == 7:
best = True if '>' in current_line[0] else False
network = current_line[1]
attached_ip = current_line[2]
print "Found Starting Network", network, attached_ip, "Best Path: {}".format(best)
for i in range(0,1000):
line = bgp_table_list[i+1]
print i
subline_line = line.split()
best_sub = 'True' if '>' in subline_line[0] else 'False'
if len(subline_line) == 6:
print 'Sub:', subline_line[1], "Best Path: {}".format(best_sub)
elif len(subline_line) == 5:
print 'Sub:', subline_line[1], "Best Path: {}".format(best_sub)
elif len(subline_line) == 7:
line = bgp_table_list[i+1]
break
输出：
Found Entry Network: 10.0.1.0/24 Nexthop: 10.8.111.45 Best Path: False Pref: 115
0
Found Network: 10.0.1.0/24 Nexthop: 10.8.11.45 Best Path: True Pref: 120
1
Found Network: 10.0.1.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
2
Found Network: 10.0.1.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
3
Found Entry Network: 10.0.3.0/29 Nexthop: 10.8.111.45 Best Path: False Pref: 115
0
Found Network: 10.0.3.0/29 Nexthop: 10.8.11.45 Best Path: True Pref: 120
1
Found Network: 10.0.3.0/29 Nexthop: 10.8.11.45 Best Path: False Pref: 120
2
Found Network: 10.0.3.0/29 Nexthop: 10.8.11.45 Best Path: False Pref: 120
3
Found Entry Network: 10.8.0.0/16 Nexthop: 10.9.0.1 Best Path: False Pref: 50
0
Found Network: 10.8.0.0/16 Nexthop: 10.8.11.45 Best Path: True Pref: 120
1
Found Network: 10.8.0.0/16 Nexthop: 10.8.11.45 Best Path: False Pref: 120
2
Found Network: 10.8.0.0/16 Nexthop: 10.8.11.45 Best Path: False Pref: 120
3
Found Entry Network: 10.9.0.0/16 Nexthop: 10.9.0.1 Best Path: False Pref: 50
0
Found Network: 10.9.0.0/16 Nexthop: 10.8.11.45 Best Path: True Pref: 120
1
Found Network: 10.9.0.0/16 Nexthop: 10.8.11.45 Best Path: False Pref: 120
2
Found Network: 10.9.0.0/16 Nexthop: 10.8.11.45 Best Path: False Pref: 120
3
Found Entry Network: 10.10.2.0/24 Nexthop: 10.8.10.2 Best Path: True Pref: 100
0
Found Network: 10.10.2.0/24 Nexthop: 10.8.11.45 Best Path: True Pref: 120
1
Found Network: 10.10.2.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
2
Found Network: 10.10.2.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
3
Found Entry Network: 10.10.5.0/24 Nexthop: 10.8.142.15 Best Path: False Pref: 85
0
Found Network: 10.10.5.0/24 Nexthop: 10.8.11.45 Best Path: True Pref: 120
1
Found Network: 10.10.5.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
2
Found Network: 10.10.5.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
3
Found Entry Network: 10.10.7.0/24 Nexthop: 10.8.40.84 Best Path: True Pref: 100
0
Found Network: 10.10.7.0/24 Nexthop: 10.8.11.45 Best Path: True Pref: 120
1
Found Network: 10.10.7.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
2
Found Network: 10.10.7.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
3
Found Entry Network: 10.10.8.0/24 Nexthop: 10.8.10.8 Best Path: True Pref: 100
0
Found Network: 10.10.8.0/24 Nexthop: 10.8.11.45 Best Path: True Pref: 120
1
Found Network: 10.10.8.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
2
Found Network: 10.10.8.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
3
Found Entry Network: 10.10.11.0/24 Nexthop: 10.8.42.8 Best Path: True Pref: 100
0
Found Network: 10.10.11.0/24 Nexthop: 10.8.11.45 Best Path: True Pref: 120
1
Found Network: 10.10.11.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
2
Found Network: 10.10.11.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
3
Found Entry Network: 10.10.12.0/24 Nexthop: 10.8.10.12 Best Path: False Pref: 100
0
Found Network: 10.10.12.0/24 Nexthop: 10.8.11.45 Best Path: True Pref: 120
1
Found Network: 10.10.12.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
2
Found Network: 10.10.12.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
3
Found Entry Network: 10.10.15.0/24 Nexthop: 10.8.10.15 Best Path: False Pref: 100
0
Found Network: 10.10.15.0/24 Nexthop: 10.8.11.45 Best Path: True Pref: 120
1
Found Network: 10.10.15.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
2
Found Network: 10.10.15.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
3
Found Entry Network: 10.10.27.0/24 Nexthop: 10.8.41.81 Best Path: False Pref: 100
0
Found Network: 10.10.27.0/24 Nexthop: 10.8.11.45 Best Path: True Pref: 120
1
Found Network: 10.10.27.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
2
Found Network: 10.10.27.0/24 Nexthop: 10.8.11.45 Best Path: False Pref: 120
3
索引号每次都回到 0 show here 打印出正在检查的行的索引。
不要强迫它成为 iter，而是继续将其用作 list，然后使用 enumerate 来了解您在 list 中的位置。
编辑：更改第一个枚举以使用 index，第二个循环的范围以 1 而不是 0 开始，并且行检查到 line = bgp_table_list[index+i]当它到达文件末尾时的 except 子句。
for index, line in enumerate(bgp_table_list):
# print line.split(), len(line.split())
current_line = line.split()
# If 7 items are in the list it's the start of a network
if len(current_line) == 7:
best = True if '>' in current_line[0] else False
network = current_line[1]
attached_ip = current_line[2]
print "Found Starting Network", network, attached_ip, "Best Path: {}".format(best)
for i in range(1, 1000):
try:
line = bgp_table_list[index+i]
except IndexError:
break
subline_line = line.split()
best_sub = 'True' if '>' in subline_line[0] else 'False'
if len(subline_line) == 6:
print 'Sub:', subline_line[1], "Best Path: {}".format(best_sub)
elif len(subline_line) == 5:
print 'Sub:', subline_line[1], "Best Path: {}".format(best_sub)
elif len(subline_line) == 7:
break
我的输出（不知道对不对，提供给大家判断）
Found Starting Network 10.0.1.0/24 10.8.111.45 Best Path: False
Sub: 10.8.11.45 Best Path: True
Sub: 10.8.11.45 Best Path: False
Sub: 10.8.11.45 Best Path: False
Found Starting Network 10.0.3.0/29 10.8.111.45 Best Path: False
Sub: 10.8.11.45 Best Path: True
Sub: 10.8.11.45 Best Path: False
Sub: 10.8.11.45 Best Path: False
Found Starting Network 10.8.0.0/16 10.9.0.1 Best Path: False
Sub: 10.8.0.1 Best Path: False
Sub: 0.0.0.0 Best Path: True
Found Starting Network 10.9.0.0/16 10.9.0.1 Best Path: False
Sub: 10.8.0.1 Best Path: False
Sub: 0.0.0.0 Best Path: True
Found Starting Network 10.10.2.0/24 10.8.10.2 Best Path: True
Sub: 10.8.10.2 Best Path: False
Sub: 10.8.10.2 Best Path: False
Found Starting Network 10.10.5.0/24 10.8.142.15 Best Path: False
Sub: 10.8.42.15 Best Path: True
Sub: 10.8.42.15 Best Path: False
Sub: 10.8.42.15 Best Path: False
Found Starting Network 10.10.7.0/24 10.8.40.84 Best Path: True
Sub: 10.8.40.84 Best Path: False
Sub: 10.8.40.84 Best Path: False
Found Starting Network 10.10.8.0/24 10.8.10.8 Best Path: True
Sub: 10.8.110.8 Best Path: False
Sub: 10.8.10.8 Best Path: False
Sub: 10.8.10.8 Best Path: False
Found Starting Network 10.10.11.0/24 10.8.42.8 Best Path: True
Sub: 10.8.42.8 Best Path: False
Sub: 10.8.42.8 Best Path: False
Sub: 10.9.42.8 Best Path: False
Found Starting Network 10.10.12.0/24 10.8.10.12 Best Path: False
Sub: 10.8.10.12 Best Path: False
Sub: 10.8.10.12 Best Path: True