# How to get the list of user defined variables

How do I get the list of user defined variables in a sage session I just loaded using the load_session command ?

How to get the list of user defined variables

add a comment

2

That's a good question. You can inspect the global variables that have been defined at any given point in a session, but most of those will be defined when various modules load on Sage startup. You can look just at those globals whose type is `sage.symbolic.expression.Expression`

, there aren't too many at startup:

```
sage: G = globals()
sage: for k in G:
....: if type(G[k]) == sage.symbolic.expression.Expression:
....: print k
golden_ratio
log2
NaN
merten
I
twinprime
pi
catalan
brun
euler_gamma
x
khinchin
i
glaisher
mertens
```

Anything not on that list is a global symbolic expression that is defined in your loaded session. Variables will be among these.

0

There is another way, taken from a different post:

sage: show_identifiers()

Please start posting anonymously - your entry will be published after you log in or create a new account.

Asked: ** 2013-02-01 18:32:41 +0200 **

Seen: **1,396 times**

Last updated: **Jan 28 '16**

Sage showed "TypeError: need a summation variable" when i used sum function with for loop

Can I define a function from a list of values?

iterating over a combinatorial class

Using @parallel in creating a list

collect multiple variables and simplify their coefficients

Converting R variables to sage

How do I perform a change of variables for a pde

How do I get an ordered list of a symbolic functions arguments?

Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.