嵌套循环+格式化多个列表

Question

Here is the code so far
Notes regarding the variables:
'ports' - there could be any number of ports in the 'ports' list
'nodes_u' this will contain any number of server names and IP address pairs
'serv_name_u' could be anything but is static once defined
'port_qty' is equal to the number of ports listed in 'ports'

ports = ['443', '80']
nodes_u = ['SERVER1', '10.0.0.1', 'SERVER2', '10.0.0.2']
serv_name_u = "TESTING"
port_qty = 2

for i in range(0, len(ports)):
    print("ltm pool "+serv_name_u+"_{0}_pool {{ \n    members {{"
          .format(ports[i]))
    for i in range(0, len(nodes_u), 2):
        print("        {0} {{ \n            address {1} \n        }}"
              .format(nodes_u[i], nodes_u[i+1]))

Here is an example of the output

ltm pool TESTING_443_pool { 
    members {
        SERVER1 { 
            address 10.0.0.1 
        }
        SERVER2 { 
            address 10.0.0.2 
        }
ltm pool TESTING_80_pool { 
    members {
        SERVER1 { 
            address 10.0.0.1 
        }
        SERVER2 { 
            address 10.0.0.2 
        }

My question or what I am trying to figure out is how I can get the port number displayed after the server name in the pool section only! so the output is like this eg

ltm pool TESTING_443_pool { 
    members {
        SERVER1:443 { <<<Port Number Here!
            address 10.0.0.1 
        }
        SERVER2:443 { <<<Port Number Here!
            address 10.0.0.2 
        }
ltm pool TESTING_80_pool { 
    members {
        SERVER1:80 { <<<Port Number Here!
            address 10.0.0.1 
        }
        SERVER2:80 { <<<Port Number Here!
            address 10.0.0.2 
        }

Every time I try something I just end up with both ports listed or the iteration jumps past the index range for the 'ports' list. Also if there is a better way to capture the input or generate the output I am all ears!

Answer 1

Remove the nested for -loop and just include both print statements in the outer for -loop, with the port number inserted at index :{1} :

for i in range(0, len(ports)):
    print("ltm pool "+serv_name_u+"_{0}_pool {{ \n    members {{"
          .format(ports[i]))
    # for i in range(0, len(nodes_u), 2):
    print("        {0}:{1} {{ \n            address {2} \n        }}"
          .format(nodes_u[i], ports[i], nodes_u[i+1]))

Output:

List of nodes:
ltm node SERVER1 { 
    address 10.0.0.1 
    }
ltm node SERVER2 { 
    address 10.0.0.2 
    }
ltm pool TESTING_443_pool { 
    members {
        SERVER1:443 { 
            address 10.0.0.1 
        }
ltm pool TESTING_80_pool { 
    members {
        10.0.0.1:80 { 
            address SERVER2 
        }

Attempt #2 : Using different incrementer names ( i and j ) in the nested for -loops to differentiate between the two lists may get the desired output:

for i in range(0, len(ports)):
    print("ltm pool "+serv_name_u+"_{0}_pool {{ \n    members {{"
          .format(ports[i]))
    for j in range(0, len(nodes_u), 2):
        print("        {0}:{1} {{ \n            address {2} \n        }}"
              .format(nodes_u[j], ports[i], nodes_u[j+1]))

Output:

ltm pool TESTING_443_pool { 
    members {
        SERVER1:443 { 
            address 10.0.0.1 
        }
        SERVER2:443 { 
            address 10.0.0.2 
        }
ltm pool TESTING_80_pool { 
    members {
        SERVER1:80 { 
            address 10.0.0.1 
        }
        SERVER2:80 { 
            address 10.0.0.2 
        }

As for a better way to capture the input or generate the output, consider using a different data structure for your inputs, like a dictionary with the keys as name , and port , and values as their respective values .