473,545 Members | 2,059 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

locals() and globals()

Hi

this exaple:

def lcl():
n=1
x=locals()
x["n"]=100
print "n in lcl() is:" +str(n)
#This will say Name error
#x["new"]=1
#print new
n=1
x=globals()
x["n"]=100
print "gobal n is:" +str(n)
x["new"]=1
print "new is:" +str(new)
lcl()

produces

gobal n is:100
new is:1
n in lcl() is:1

shouldn't be n in lcl() 100 too?

why accessing the names dictionary globals() and locals() gives
different results?
This example was made using
Python 2.4.3 (#69, Mar 29 2006, 17:35:34) [MSC v.1310 32 bit (Intel)] on win32

PAolo
Oct 14 '06 #1
1 1562
Paolo Pantaleo wrote:
Hi

this exaple:

def lcl():
n=1
x=locals()
x["n"]=100
print "n in lcl() is:" +str(n)
#This will say Name error
#x["new"]=1
#print new
n=1
x=globals()
x["n"]=100
print "gobal n is:" +str(n)
x["new"]=1
print "new is:" +str(new)
lcl()

produces

gobal n is:100
new is:1
n in lcl() is:1

shouldn't be n in lcl() 100 too?

why accessing the names dictionary globals() and locals() gives
different results?
Python is statically scoped. The name bindings are fixed at compile
time. Hence you can't achieve dynamic scoping by using the locals()
dictionary and add new names to the locals() which might eventually be
used as local variables in the body of the function. The function still
controls its own state and does not permit delegating state changes via
locals(). That's what objects are for.

Oct 14 '06 #2

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

Similar topics

2
2384
by: Giles Brown | last post by:
I do not understand why the following code produces NameError: name 'FirstClass' is not defined when both a global and local dict are passed into exec, but not when only a global dict is passed in. I seek enlightenment! Thanks, Giles Brown
2
4177
by: tedsuzman | last post by:
----- def f(): ret = 2 exec "ret += 10" return ret print f() ----- The above prints '12', as expected. However,
45
2629
by: It's me | last post by:
I am new to the Python language. How do I do something like this: I know that a = 3 y = "a" print eval(y)
2
3082
by: xml0x1a | last post by:
How do I use exec? Python 2.4.3 ---- from math import * G = 1 def d(): L = 1 exec "def f(x): return L + log(G) " in globals(), locals() f(1)
0
7473
marktang
by: marktang | last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main...
0
7660
Oralloy
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed. This is as boiled down as I can make it. ...
0
7813
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 tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that...
1
7431
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For...
0
7761
tracyyun
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the...
0
5976
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then...
1
5337
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules. He will explain when you may want to use classes...
0
4949
by: conductexam | last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert...
1
1888
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system

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.