I'm attempting to create a program where the user inputs their account number 
(which must be 8 digits) and if what the user enters is not 8 digits in length 
I want python to tell the user this is invalid and then keep asking for the 
account number until a suitable number has been entered.
 I'm guessing it's a sort of while loop but I'm not 100% sure as I'm quite new 
to Python.
 
So far I have...



 
userAccountNumber = eval(input("Please Input Your Account Number:"))
while userAccountNumber > 100000000 or <=9999999:
    print userAccountNumber ("Invalid Account Number! Account Must Be Eight 
Digits")
 
 
 
When I run this however it gives me an invalid syntax and highlights the = in 
<=9999999:
 
Would appreciate any help with sorting this out.
 
Thank you.
                                          
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