Validating a string in Python - how do you check a variable and make it have at least 1 numeric character?

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Python

string

validation

Hi, I'm trying to make this variable "username" go through all these conditions, however, I can't seem to figure out the last condition - making sure the variable has at least one digit.

Any help would be greatly appreciated!

username = input("Please enter a username: ")



while len(username) < 8 or len(username) > 15:
    print("Username must be between 8 and 15 characters long.")
    username = input("Please enter a username: ")
while username.isalnum() == False:
    print ("Username can only contain alphanumeric characters.")
    username = input("Please enter a username: ")
while username.islower() == True:
    print ("Usernames must contain at least one uppercase character")
    username = input("Please enter a username: ")
while username.isupper() == True:
    print ("Usernames must contain at least one lowercase character")
    username = input("Please enter a username: ")
while username[0].isnumeric() == True:
    print ("The first character in a username cannot be a digit")
    username = input("Please enter a username: ")
while username[-1].isnumeric() == True:
    print ("The last character in a username cannot be a digit")
    username = input("Please enter a username: ")   
while any(username.isdigit()) == False:
    print ("Usernames must contain at least one numeric character") # can't figure this one out
    username = input("Please enter a username: ")
    break

What I have tried:

I've tried what you see above, also finding a way around it by making a condition like ".isalpha" and making it test false, but I just don't know how to test if only one of the characters in the string are a number.