Python while loop back to specific point in code

Question

I'm very new to python. I need to loop back to a specific point in my code when a condition is not met.

Here is the code:

# Get user input on VLANs and interfaces to change
print ("what VLAN ID do you want to add? "),
vlan = raw_input()

print ("what interface do you want to add the VLAN to? (e.g. eth10)"),
interface = raw_input()

# Confirm details
print "So we are adding VLAN %r to interface %r" % (vlan, interface)

print ("Are the details above correct? (Yes/No)")
goodtogo = raw_input("> ")

if goodtogo == "yes":
    print "Configuring now...."

else:
    print "Please fix your error"

while goodtogo != "yes":
    print ("Starting again...")
    # Some type of code to loop back to start goes here!!

# Runs commands to add gathered config to switch
switch.runCmds(1, ["enable", "configure terminal", "vlan " + vlan, "interface " +     interface, "switchport mode access", "switchport access vlan " + vlan, "end" ])

print ("Change completed")

So what I need to happen is that when 'goodtogo' does not equal yes, to loop back to the start of the code. Really not sure what to do here...

this behaviour is typically referred to as encapsulation and function calling — Joran Beasley
– Joran Beasley, Commented Feb 26, 2014 at 22:57

Joran Beasley · Accepted Answer · 2014-02-26 23:02:18Z

1

def get_vlan_iface():
    while True:
        vlan = raw_input ("what VLAN ID do you want to add? "),
        iface = raw_input("what interface do you want to add the VLAN to? (e.g. eth10)")
        print "So we are adding VLAN %r to interface %r" % (vlan, interface)

        if raw_input("Are the details above correct? (Yes/No)>")[0].lower() == "y":
             return vlan,iface
        print "Please Fix Your Entries!"

vlan,iface = get_vlan_iface()

would be one way of doing it

answered Feb 26, 2014 at 23:02

Joran Beasley

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2 Comments

McJim Over a year ago

Thanks, that works well however i'm getting an error after that now when i run the script: Traceback (most recent call last): File "autovlan2.py", line 38, in <module> switch.runCmds(1, "enable", "configure terminal", "vlan " + vlan, "interface " + iface, "switchport mode access", "switchport access vlan " + vlan, "end" ) TypeError: cannot concatenate 'str' and 'tuple' objects. It is refering to the last line of code where I do the switch.runCmds

McJim Over a year ago

Ah, yeah there was a rouge , at the end of the vlan = raw_input line. when printing vlan it came up as ('1111',) I removed the , and it works a treat now. thanks again

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