what's the NameError mistake?

Question

The code is pretty simple im just starting programming in python

the code

man = input ("what's your name mister")
print("his name is "+man)

the message i get after running the program

Traceback (most recent call last):
  File "<pyshell#0>", line 1, in <module>
    alex
NameError: name 'alex' is not defined

Are you sure that's all the code? The traceback implies that you are referencing a variable named `alex`, but your code does not show that. — mipadi, Jul 30 '15 at 18:02
possible duplicate of ["NameError: name '' is not defined" after user input in Python](http://stackoverflow.com/questions/2090706/nameerror-name-is-not-defined-after-user-input-in-python) — TigerhawkT3, Jul 30 '15 at 18:03
it's python 3.4.3 and the name alex i wrote it after running the program . — kh med, Jul 30 '15 at 18:04
Are you 100% sure it's Python 3.4.3? What does it say if you do `import sys; print(sys.version)`? — Kevin, Jul 30 '15 at 18:09
it take me to another window with this : Python 3.4.3 (v3.4.3:9b73f1c3e601, Feb 24 2015, 22:43:06) [MSC v.1600 32 bit (Intel)] on win32 Type "copyright", "credits" or "license()" for more information. >>> (it's the same window i get when i run my program) — kh med, Jul 30 '15 at 18:13
Possible duplicate of [input() error - NameError: name '...' is not defined](https://stackoverflow.com/questions/21122540/input-error-nameerror-name-is-not-defined) — pppery, Oct 25 '19 at 00:17

score 1 · Answer 1 · edited May 23 '17 at 12:21

In python 2, "input" takes what you enter, and tries to treat it like a python expression. So it treats your string "alex" as the name of a variable. If you do not have a variable named "alex", it creates an error trying to look for it. Here's an example

alex = "Hello world"
x = input()
print x

If I enter "alex" in the input, this will print "Hello world." If you want to take a string as input instead, use raw_input().

alex = "Hello world"
x = raw_input()
print x

This would print "alex", not "hello world."

If you are using python 3, "input" behaves the exact same way as "raw_input" does in python 2. I just ran your code in python 3 and did not get any error, so you are probably using 2.

Also, here is more info about input and raw_input.

score 1 · Accepted Answer · answered Jul 30 '15 at 18:29

1

Thank you guys for trying to find out the error i found out the mistake , i was clicking Run And then Python shell instead i clicked in run module and it works , im sorry again

answered Jul 30 '15 at 18:29

kh med

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what's the NameError mistake?

2 Answers2