CODEWITHSUNDEEP
pythonpython-3.xnameerror
JavierTrc
JavierTrc

Reputation: 21

NameError: global name 'cb' is not defined

I am trying to make a program that calculates the biggest number of objects(nuggets) you can't get with packages of 6-9-20 (I am fairly new to python, i trying using global and nonlocal but it doesn't work either).

def nuggets(n):
    x = 6
    y = 9
    z = 20
    for i in range(0,n//x+1): 
        for j in range(0,n//y+1):
            for k in range(0,n//z+1):
                if i*x + j*y + k*z == n:
                    return [i,j,k]
    return None

def cant_buy(n):
    seq=0
    for i in range(n):
        p=nuggets(i)
        if type(p)== list:
            seq+=1
        elif type(p)== None:
            cb=i
            seq=0
    return cb

Then this error appears: Traceback (most recent call last): File "", line 1, in cant_buy(12) File "C:\Python33\OCW 6.00\ps2a.py", line 22, in cant_buy return cb NameError: global name 'cb' is not defined

What is wrong? I defined it at the elif statement.

Upvotes: 2

Views: 1234

Answers (1)

tkor
tkor

Reputation: 11

When I run your code, I got a slightly different yet maybe more clarifying error message. It said: "UnboundLocalError: local variable 'cb' referenced before assignment"

So Python tried to use a variable that was unkown yet.

To declare your variable "cb" before you use it in your loop like so:

def cant_buy(n):
    cb = 0  # <---- insert this
    seq=0
    for i in range(n):
        p=nuggets(i)
        if type(p)== list:
            seq+=1
        elif type(p)== None:
            cb=i
            seq=0
    return cb

should do the trick.

Upvotes: 1

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