473,390 Members | 1,115 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,390 software developers and data experts.

Function return a dictionary

Hi all,

I'm doing a function which needs return an arrary -- or more specially a
dictionary data type.
I have a sample like this

def AFC():
v["a"] = 1
return v

v = AFC()
print v["a"]

with error
NameError: global name 'v' is not defined

how do I go about it?

Thanks in advance.
Boris Mok
Oct 1 '07 #1
2 28968
Boris Mok <bo******@iwow.com.sgwrites:
I'm doing a function which needs return an arrary -- or more specially
a dictionary data type.
Yes. Python doesn't have an "array" type natively, and it's confusing
to refer to a dict as an array because there *are* "array"s in PyNum.
I have a sample like this

def AFC():
v["a"] = 1
return v
Your function never specifies where 'v' comes from. So, when you first
attempt to access an item from 'v' as an existing dict, you get a
NameError.

If you want to create 'v' inside the function, you'll need to do so
before attempting to use it.

def foo():
bar = {"spam": 1}
return bar

cheeseburger = foo()
print cheeseburger["spam"]

To get a thorough grounding in basic concepts like this, please work
through the Python tutorial <URL:http://docs.python.org/tut/>, from
beginning to end, running every example and experimenting until you
understand why it does what it does, before moving onto the next.

--
\ "[T]he question of whether machines can think [...] is about as |
`\ relevant as the question of whether submarines can swim." |
_o__) —Edsger W. Dijkstra |
Ben Finney
Oct 1 '07 #2
Boris Mok <bo******@iwow.com.sgwrote:
Hi all,

I'm doing a function which needs return an arrary -- or more specially a
dictionary data type.
I have a sample like this

def AFC():
v["a"] = 1
return v

v = AFC()
print v["a"]

with error
NameError: global name 'v' is not defined

how do I go about it?
At some point you have to initialise v to a dictionary, Python isn't going
to guess for you. e.g.

def AFC():
v = {}
v["a"] = 1
return v
Oct 1 '07 #3

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

5
by: david | last post by:
Hi All, I just want to write a function return char array,but I cant. I am not good at C++ 's concept since I used to use Java before. Would you please help me to fix that ? Thanks.. Best...
4
by: wongjoekmeu | last post by:
Hello All, I know that when you pass an argument to a function (if you want let the function be able to change the value) then you can choose to pass the argument by reference or a pointer to...
8
by: Ravindranath Gummadidala | last post by:
Hi All: I am trying to understand the C function call mechanism. Please bear with me as I state what I know: "every invocation of a function causes a frame for that function to be pushed on...
7
by: chellappa | last post by:
hi this program return value automatically ... how it is possible ..i am not return any value... but i return correct values i am using Linux -gcc complier please tell me what is this main() {...
8
by: bdobby | last post by:
Hi. I am relatively new to js, but I did think I was starting to get the hang of it. Then this happened... I have a form with an onsubmit event handler: <form id="uploadForm" method="post"...
9
by: mtczx232 | last post by:
it's posible that Function return byref? what the syntax?
1
by: holdingbe | last post by:
Hi all, Normally, the stored function return one values per time.In oracle9i pipelined functions return the amount of data at a time, the first step create a type object. CREATE OR...
6
by: John | last post by:
Hi I have a function that needs to return value from some column in a table. The column type is not known in advance. Is it possible for function to return a value whose type would be determined...
4
by: barcaroller | last post by:
I am trying to adopt a model for calling functions and checking their return values. I'm following Scott Meyer's recommendation of not over-using exceptions because of their potential overhead. ...
10
by: AlFire | last post by:
Hi, I am seeking an explanation for following: Python 2.5.2 (r252:60911, Apr 8 2008, 21:49:41) on linux2 Type "help", "copyright", "credits" or "license" for more information. .... {}
0
by: taylorcarr | last post by:
A Canon printer is a smart device known for being advanced, efficient, and reliable. It is designed for home, office, and hybrid workspace use and can also be used for a variety of purposes. However,...
0
by: Charles Arthur | last post by:
How do i turn on java script on a villaon, callus and itel keypad mobile phone
0
by: emmanuelkatto | last post by:
Hi All, I am Emmanuel katto from Uganda. I want to ask what challenges you've faced while migrating a website to cloud. Please let me know. Thanks! Emmanuel
0
BarryA
by: BarryA | last post by:
What are the essential steps and strategies outlined in the Data Structures and Algorithms (DSA) roadmap for aspiring data scientists? How can individuals effectively utilize this roadmap to progress...
1
by: nemocccc | last post by:
hello, everyone, I want to develop a software for my android phone for daily needs, any suggestions?
1
by: Sonnysonu | last post by:
This is the data of csv file 1 2 3 1 2 3 1 2 3 1 2 3 2 3 2 3 3 the lengths should be different i have to store the data by column-wise with in the specific length. suppose the i have to...
0
by: Hystou | last post by:
There are some requirements for setting up RAID: 1. The motherboard and BIOS support RAID configuration. 2. The motherboard has 2 or more available SATA protocol SSD/HDD slots (including MSATA, M.2...
0
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can...
0
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.