NameError : name 'x' is not defined Python NameError

The first video in the series dedicated to debugging various python errors. This video covers the NameError within python.

[GretSeat]

Welp, that didn't help. That just told me what a name error is. I want to know how to fix my name error. I HAVE defined my variable, but it still says it's not defined. Hmm. 

[gokulyel]

How to actually remove the Nameerror..
Could you post the solution to the error..like for the X+=1..How did you correct that

[daryldyehouse]

Love that he has 35K views and not one of those views had their question answered.

[mikemkgta]

how do you define something then? like "multiply"

[ARJUN-opdh]

As soon as i click IDLE, it pops up "IDLE's subprocess didn''t make a connection.

also Socket error

pls help

>>> 2+3
IDLE internal error in runcode()
Traceback (most recent call last):
File "D:\Python\lib\idlelib\rpc.py", line 236, in asyncqueue
if threading.current_thread() != self.sockthread:
AttributeError: 'MyRPCClient' object has no attribute 'sockthread'
>>>

-I am getting this error if I type just simple code, can u help to fix it

[mikemkgta]

i dont get it
im having an issue with how to define something like multiply. im thinking it is app=Flask (_multiply_)

[navneetsingh]

first initialise the var like x=" ", then write the code x += 1....

[standinginthelimelight]

Hi, if you somehow didn't understand the tutorial, read this instead of sending toxic comments.
A NamError is something that occurs if python doesn't see where you defined your variable. For example, say your mom said to add a mango to a fruits list. What will you say? Logically, we'd make a new list but python isn't like this. You NEED to tell python what the value of x even is.
Example:

X = 1
Y = 2

print(X + Y)

Since you told python the values of x and y, it won't return an error! It's that simple!

[alameerahh]

hello
please i have this error
Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Users\User\Anaconda3\lib\tkinter\__init__.py", line 1699, in __call__
return self.func(*args)
File "<ipython-input-12-2a0f40444ef6>", line 54, in <lambda>
command=(lambda e=ents: fetch(e)))
File "<ipython-input-12-2a0f40444ef6>", line 19, in fetch
clf.fit(self.Numerical, self.Catagorical)
NameError: name 'self' is not defined
can you help me to handle it

[muhammadaliabid]

import numpy as np
def calc_euler_explicit(du, fu, delta_x, delta_t, gamma, c_offset):        nmax = len(fu)
        tt = gamma * delta_t / (delta_x * delta_x)
        su = c_offset * delta_t        for n in range(1, nmax-1):
                du[n] = tt * (fu[n+1] - 2.0 * fu[n] + fu[n-1]) + su
if__name__ == '__main__'
nmax = 15
delta_x = 1.0 / (nmax - 1)
fu = np.zeros(nmax)
du = np.zeros(nmax)  
for steps in range(1000):
        calc_euler_explicit(du, fu, delta_x, 1.0e-3, 1.0, 4.0)
        fu += du
        print("#  x    fu")
        for n, fu_n in enumerate(fu):
                print("%e %e" % (n * delta_x, fu_n))

visex.py

Dear, I am running the above code, but got the name error if name is not defined. I don't understand what is the problem?
looking forward for your guideline.

Thanks and Regards,
Ali

[cristianbatohinay]

Type 'x' that ah code thank you

[paulaandrea]

Thanks for not fixing the error Duh!
give me back my 5 mins of wasted time

[johnhannon]

Excellent waste of time! You have this down to a science sir! Well done...Bravo! I learned nothing! Beautifully done!

[Madgamr]

Python is possibly the crappiest language I’ve ever used.