I'm new to Python, and I'm trying to compile a VERY simple code in Python (using Atom editor), and after I run this code:
name = input("Name:")
print(f"hello, {name}")
And after typing in any name (in this case I simply typed in n, I get this error message:
Name:n
Traceback (most recent call last):
File "hello_name.py", line 1, in <module>
name = input("Name:")
File "<string>", line 1, in <module>
NameError: name 'n' is not defined
I hope you can help! Thanks!
You need to use raw_input instead of input, because input runs eval on the input. (Only in python 2, in Python 3 input has the same behavior of raw_input and raw_input is removed)
What that means is that after getting your input, python would evaluate your input as if it was code.
Try entering "3+2*5-2" in the input and see the output.
(Note that writing something like:"x = 5" won't work, because eval just evaluates an expression, like y+3 (assuming y is defined) and it does not actually run the code)
(But really, you should use python 3 if you are just learning Python and you are not already used to python2)
yes its right i also phase a problem like that and my code is
name = input("enter you name: ")
print(name)
so i enter my name Anshu
then it show this error
Traceback (most recent call last):
File "/home/anshu/Projects/coding/python/dictnory_problem.py", line 6, in
search = input("enter your keyword: ")
File "", line 1, in
NameError: name 'anshu' is not defined
then i change my code i use
name = raw-input("enter your name")
print(name)
Related
I'm using SublimeText 3. I installed SublimeREPL to run my current Python file so I could see returns on inputs on simple practice exercises. Here's my ridiculously simple code:
name = input("What is your name: ")
print name
I went to test it out and I am getting the following error:
What is your name: Justin
Traceback (most recent call last):
File "Practice Exercise 1.py", line 2, in <module>
name = input("What is your name: ")
File "<string>", line 1, in <module>
NameError: name 'Justin' is not defined
***Repl Closed***
Seems like it wants to think of "Justin" as a function or something. If you guys could help me out, that'd be great.
You need your input to be in quotes... i.e. What is your name: "Justin"
See here as an example https://www.python-course.eu/input.php
Seems like you are running Python2. In which case, change input() to raw_input().
If you're using python 3, print is a function and must be called using parenthesis.
print(name)
Seems you’re using python 2. You should probably be using python 3 unless you have a reason (eg: backwards compatibility). In python 2, input() interprets the input so you probably want to use raw_input() like this:
name = raw_input("What is your name: ")
print name
This question already has answers here:
input() error - NameError: name '...' is not defined
(15 answers)
Closed 7 years ago.
I'm completely lost as to why this isn't working. Should work precisely, right?
UserName = input("Please enter your name: ")
print ("Hello Mr. " + UserName)
raw_input("<Press Enter to quit.>")
I get this exception:
Traceback (most recent call last):
File "Test1.py", line 1, in <module>
UserName = input("Please enter your name: ")
File "<string>", line 1, in <module>
NameError: name 'k' is not defined
It says NameError 'k', because I wrote 'k' as the input during my tests. I've read that the print statement used to be without parenthesis but that has been deprecated right?
Do not use input() in 2.x. Use raw_input() instead. Always.
In Python 2.x, input() "evaluates" what is typed in. (see help(input)). Therefore, when you key in k, input() tries to find what k is. Because it is not defined, it raises the NameError exception.
Use raw_input() in Python 2.x. In 3.0x, input() is fixed.
If you really want to use input() (and this is really not advisable), then quote your k variable as follows:
>>> UserName = input("Please enter your name: ")
Please enter your name: "k"
>>> print UserName
k
The accepted answer provides the correct solution and #ghostdog74 gives the reason for the exception. I figured it may be helpful to see, step by step, why this raises a NameError (and not something else, like ValueError):
As per Python 2.7 documentation, input() evaluates what you enter, so essentially your program becomes this:
username = input('...')
# => translates to
username = eval(raw_input('...'))
Let's assume input is bob, then this becomes:
username = eval('bob')
Since eval() executes 'bob' as if it were a Python expression, your program becomes this:
username = bob
=> NameError
print ("Hello Mr. " + username)
You could make it work my entering "bob" (with the quotes), because then the program is valid:
username = "bob"
print ("Hello Mr. " + username)
=> Hello Mr. bob
You can try it out by going through each step in the Python REPL yourself. Note that the exception is raised on the first line already, not within the print statement.
This question already has answers here:
input() error - NameError: name '...' is not defined
(15 answers)
Closed 7 years ago.
I'm completely lost as to why this isn't working. Should work precisely, right?
UserName = input("Please enter your name: ")
print ("Hello Mr. " + UserName)
raw_input("<Press Enter to quit.>")
I get this exception:
Traceback (most recent call last):
File "Test1.py", line 1, in <module>
UserName = input("Please enter your name: ")
File "<string>", line 1, in <module>
NameError: name 'k' is not defined
It says NameError 'k', because I wrote 'k' as the input during my tests. I've read that the print statement used to be without parenthesis but that has been deprecated right?
Do not use input() in 2.x. Use raw_input() instead. Always.
In Python 2.x, input() "evaluates" what is typed in. (see help(input)). Therefore, when you key in k, input() tries to find what k is. Because it is not defined, it raises the NameError exception.
Use raw_input() in Python 2.x. In 3.0x, input() is fixed.
If you really want to use input() (and this is really not advisable), then quote your k variable as follows:
>>> UserName = input("Please enter your name: ")
Please enter your name: "k"
>>> print UserName
k
The accepted answer provides the correct solution and #ghostdog74 gives the reason for the exception. I figured it may be helpful to see, step by step, why this raises a NameError (and not something else, like ValueError):
As per Python 2.7 documentation, input() evaluates what you enter, so essentially your program becomes this:
username = input('...')
# => translates to
username = eval(raw_input('...'))
Let's assume input is bob, then this becomes:
username = eval('bob')
Since eval() executes 'bob' as if it were a Python expression, your program becomes this:
username = bob
=> NameError
print ("Hello Mr. " + username)
You could make it work my entering "bob" (with the quotes), because then the program is valid:
username = "bob"
print ("Hello Mr. " + username)
=> Hello Mr. bob
You can try it out by going through each step in the Python REPL yourself. Note that the exception is raised on the first line already, not within the print statement.
On my learning phase of python (2.7). I am following a "how to" book, and this is the first thing that has not worked. The topic is interactive inputs.
They give the code, which I think I typed in correctly:
name=input('Enter your name ')
I then execute the line and it gives me the prompt I would expect:
Enter your name
Next to the prompt, I type in my name and press enter. But instead of it creating an object I get an error.
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<string>", line 1, in <module>
NameError: name 'Myles' is not defined
I have done this both in IDLE and my IDE (Spyder) and get the same error. So what dumb thing am I doing?
Thanks
Don't use:
name = input(...)
Use:
name = raw_input(...)
I tried to write my first python program and I already get an error message. In the textbook introduction to computer science using python i found the following code:
name = input('What is your name? ')
print('Hello', name)
print('Welcome to Python!')
I checked multiple times for errors and I'm quite sure i typed it exactly like the textbook states. I saved the program as MyFirstProgram.py and after that i ran the module (by pressing F5). If i understand correctly the program asks you to fill in a name. So i typed 'John'. But when i did, the following error occurs:
Traceback (most recent call last):
File "C:/Users/Wout/.ipython/MyFirstProgram.py", line 3, in <module>
name = input('What is your name? ')
File "<string>", line 1, in <module>
NameError: name 'John' is not defined
Why is 'John' not defined? Isn't it the purpose of the program to enter any name? Why do i have to define it? I followed the instructions to the letter...
Kind regards
input, in Python 2, evaluates the input as if it were a snippet of Python code. This is almost never what you want. Use raw_input instead.
By the way, you're writing your code as if it were Python 3, but you appear to be using a Python 2 interpreter. If you run your code with Python 3, it will work fine (input in Python 3 is the same as raw_input in Python 2).
You should use raw_input() instead of an input(), since you are on python-2.x:
name = raw_input('What is your name? ')
print('Hello', name)
print('Welcome to Python!')
prints:
What is your name? John
('Hello', 'John')
Welcome to Python!
You are following a textbook for Python 3 but using Python 2. In Python 2, must use raw_input and don't need brackets on print statements.
'John' will work with input (John won't work), however you should use raw_input() like the others said