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+--- Thread: how to display name of a list? (/thread-35864.html)
how to display name of a list? - 3lnyn0 - Dec-24-2021
Hi! I have a function and I give it as a parameter a list. How can I display the name of the list which I use not the element?
a = [name, street, city]
b = [colour, height, weight]
def add_info(name)
print(f'Do you you want to add info for {a}?) ---> here I want to print 'a' not the list element
add_info(a)
RE: how to display name of a list? - ndc85430 - Dec-24-2021
Sounds like you want to keep your lists together in another collection - use a dictionary, where the keys are the names you want and the values are the lists.
RE: how to display name of a list? - 3lnyn0 - Dec-24-2021
(Dec-24-2021, 12:46 PM)ndc85430 Wrote: Sounds like you want to keep your lists together in another collection - use a dictionary, where the keys are the names you want and the values are the lists.
I have to use lists in this project.
RE: how to display name of a list? - deanhystad - Dec-24-2021
Your program has a variable named "a", but the variable doesn't know this. Why not do this if you want to use the variable name:
def add_info(name)
print('Do you want to add info for a?'Or a better namedef add_info(name)
print('Do you want to add info for address?'
RE: how to display name of a list? - 3lnyn0 - Dec-24-2021
(Dec-24-2021, 01:16 PM)deanhystad Wrote: Your program has a variable named "a", but the variable doesn't know this. Why not do this if you want to use the variable name:
def add_info(name) print('Do you want to add info for a?'Or a better name
def add_info(name) print('Do you want to add info for address?'
In the output should be displayed every time the name of the list.
If I use list a print should be "Do you want to add info for a?", and when I use list b print should b "Do you want to add info for b?"
The name should change automatically, depending on which list you use as a parameter
RE: how to display name of a list? - deanhystad - Dec-24-2021
Then you will have to make something that associates a name with a list.
named_list = ["Name", [list items]]
This is ugly, and that is why Python contains constructs other than lists that make it less ugly. Guess you'll learn about those later.
I wonder if your question is wrong. What are you trying to do? I don't mean "How do I print out the name of my list?" I mean what is the problem you are trying to solve? Why are you printing the name of the list?
RE: how to display name of a list? - BashBedlam - Dec-24-2021
Here's one way to go about it:
a = [1,2,3]
def say (var):
for name in globals():
if eval (name) == var:
print(f'Variable name is {name}.')
say(a)
RE: how to display name of a list? - ndc85430 - Dec-25-2021
No, please don't teach people to use
eval and things like that :(. They'll end up leaning on it and writing code that is hard to maintain.
RE: how to display name of a list? - jefsummers - Dec-27-2021
Backward tracing from a value to the name is problematic. An object may have multiple variable names pointing to it - and which one do you want? Example:
a = [1,2,3] b = a b[1] = 4 print(a)
Output:[1, 4, 3]