Python while循環回代碼中的特定點

Question

我對Python非常陌生。當條件不滿足時，我需要循環回代碼中的特定點。

下面是代碼：

# 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") 

所以我需要發生的是，當「goodtogo」不等於肯定，循環回到代碼的開始。真的不知道該怎麼辦在這裏...

Answer 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() 

會做