Beginner Level - Name Error

[Aniket]

Hello Everyone,

I am new to Python and have recently started working on it.

Please help me resolve the error

My code is

def hello():
    print("Hello Everyone")

hello()

Error is

>>> hello()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'hello' is not defined

Please let me know where I am wrong. Thank You

[moste]

You are probably using python 2 and this is the syntax for python 3 interpreter. :D

[perfringo]

In interactive interpreter it works like this:

>>> def hello():
...     print('Hello everyone')
... 
>>> hello()
Hello everyone

However, if your code in file then you should run the file.

[Aniket]

Please see the complete message from Terminal

Windows PowerShell
Copyright (C) Microsoft Corporation. All rights reserved.

PS C:\Users\le851ds\Desktop\Python Blockchain> & C:/Users/le851ds/AppData/Local/Programs/Python/Python37-32/python.exe
Python 3.7.3 (v3.7.3:ef4ec6ed12, Mar 25 2019, 21:26:53) [MSC v.1916 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> hello()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'hello' is not defined

[moste]

In the last one, i dont see your def.

[Aniket]

In the last one, i dont see your def.

The code is

def hello():
    print("Hello Everyone")

hello()

The message in terminal is

Windows PowerShell
Copyright (C) Microsoft Corporation. All rights reserved.

PS C:\Users\le851ds\Desktop\Python Blockchain> & C:/Users/le851ds/AppData/Local/Programs/Python/Python37-32/python.exe
Python 3.7.3 (v3.7.3:ef4ec6ed12, Mar 25 2019, 21:26:53) [MSC v.1916 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> hello()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'hello' is not defined
>>>

[moste]

ok now i got you!
You have to execute the script file via terminal (type: python3 my_script.py)
The def hello() is in your file, trying to use this def from the interpeter, without opening the file, will never work!

I'm sorry for my poor english :P
I hope, that i helped you!

[snippsat]

What editor/shell are using to run this?
The script is not connect or in same folder as the interactive interpreter run.

Different Editors/shell can deal with this different,some dos it automatic and some dos not.
Just from command line can use -i.
python -i my_script.py or a better interactive interpreter,like ipython or ptpython eg ptpython -i my_script.py.

[Aniket]

I am sorry I couldn't really understand the solutions as I new to coding.

However, when I Started Debugging from the drop down options above, I got the following message

Windows PowerShell
Copyright (C) Microsoft Corporation. All rights reserved.

PS C:\Users\le851ds\Desktop\Python Blockchain> cd 'c:\Users\le851ds\Desktop\Python Blockchain'; ${env:PYTHONIOENCODING}='UTF-8'; ${env:PYTHONUNBUFFERED}='1'; & 'C:\Users\le851ds\AppData\Local\Programs\Python\Python37-32\python.exe' 'c:\Users\le851ds\.vscode\extensions\ms-python.python-2019.3.6558\pythonFiles\ptvsd_launcher.py' '--default' '--client' '--host' 'localhost' '--port' '51587' 'c:\Users\le851ds\Desktop\Python Blockchain\tryingblockchain.py'
Hello Everyone

I will keep exploring.

Thank you for your help.

Appreciate it.

[buran]

check this tutorial
you mix executing python script from command line/terminal and using python interactive mode
https://python-forum.io/Thread-How-to-Ex...ython-code