NameError: name is not defined when using it in if statement

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I'm creating a basic login that verifies if the password entered and the confirmation of that password match.

def login():  
  username = input("Please enter a username:")
  password = input("Please enter a password:")
  confirmPass = input("Please confirm your password:")

login()

if password == confirmPass:
  print("You have signed up")

I get the error that name password is not defined.

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You are close, simply return the values from password, confirm_pass from your function. Also snake_case not camelCase https://www.python.org/dev/peps/pep-0008/

def login():  
    username = input("Please enter a username:")
    password = input("Please enter a password:")
    confirm_pass = input("Please confirm your password:")
    return password, confirm_pass

password, confirm_pass = login()

if password == confirm_pass:
    print("You have signed up")

Common Python 3 Error Messages (and How to Eliminate Them!), This variable is defined in my if statement, where it should return its value. Can anyone please help me to understand what I am doing wrong. Re: Name not defined (if statement error) #6 Post by philat » Sun Oct 11, 2015 10:57 am If I'm understanding you correctly, you should be doing the following (all properly indented for where it is, of course).

It is best that you do not declare any variables within the function if you are not sure. Try the code below:

username = input("Please enter a username:")
password = input("Please enter a password:")
confirmPass = input("Please confirm your password:")

def match_password(password,confirmPass):  
    if password == confirmPass:
        print("You have signed up")
    else:
        print("Passwords do not match")

match_password(password,confirmPass)

All your variables are declared based on inputs outside your function to validate the passwords.

We'll cover those with separate examples. It's simply not defined nowhere in the code#. It's possible that you forgot to initialize it, specially if it is a constant I'm following the instructions here and here, to install graphite. This is on a CentOS 6.7 box, using python 2.7. When I installed django using pip, it installed 1.10.5. When I get to the step

I would rather return values out of a function - but if you would prefer to use module-level globals just define username and password before calling login().

Something like:

def login():  
    username = input("Please enter a username:")
    password = input("Please enter a password:")
    confirmPass = input("Please confirm your password:")

username = ""
password = ""

login()

if password == confirmPass:
    print("You have signed up")

That should work the way you had expected, I believe.

means that Python tried to use a variable or function name, such as hello based on a previous definition. If it hasn't been defined at this point, you get the error. Usual Causes: A mistyped variable or function name. Forgetting to indent the statements within a compound statement (such as the bodies of if and for) Forgetting to indent the statements of a user-defined function NameError: global name '---' is not defined. Python knows the purposes of certain names (such as names of built-in functions like print). Other names are defined within the program (such as variables).

Can you call a function before it has been defined Python? This I would disagree with - the lazy way to do this is to initialise all variables at the start of a game; the right way to do this is to ensure that the variables you're relying on get set regardless of the path you take through the game, finish all your testing and then default everything right at the beginning just to be sure.

include: Forgetting to give a variable a value before using it in another statement. The program checks the name of the word to match any of the variables defined. If the name is not matched to any of the above, it will be thrown as the name defined is not identified by the program. The program expects to qualify the name for any of the known python structures. In python, “math” is the name of a module which is responsible

def new_line(): print # a print statement with no arguments prints a new line If an error occurs during a function call, Python prints the name of the function, and​  To solve the Python “NameError: name ‘logging’ is not defined”, include the import statement for logging module before you are actually using the logging module. The solution is same for any module, which you may have used, but not imported at the start of program.

Comments
  • Read about local and global variables. This is not about the if about about the function.
  • Unless you mean to use local and global variables, its best not to. Declare your variables outside the function.
  • I don't think use of globals should be encouraged, especially to a beginner.
  • @MateenUlhaq I didn't mean to promote the use of global variables, I was just trying to point out that there's more than one way to solve the issue.