Today, We want to share with you python check if variable exists.In this post we will show you python check if variable is not none, hear for python check if variable is null we will give you demo and example for implement.In this post, we will learn about python tkinter button click event with an example.
How do I check if a variable exists in python?
If a variable exists, then it is defined either locally based or globally based. A local type variable is defined inside a function, while a global variable is defined outside a function.
CHECK IF A VARIABLE EXISTS LOCALLY OR GLOBALLY
Use locals() to return a dictionary of main variables defined locally based. Use the syntax variable in locals() to check if a variable is defined locally.
Example 1: checks if user_type_id is a local variable
def f():
user_type_id = 0
is_local = "user_type_id" in locals()
print(is_local)
f()
//RESULTS
True
so simple you can Use globals() to return a data dictionary for variables defined globally based.
Example 2: checks if user_type_id is a global variable
def f():
user_type_id = 0
is_global = "user_type_id" in globals()
print(is_global)
f()
//RESULTS
False
I hope you get an idea about global and local variables.
I would like to have feedback on my infinityknow.com blog.
Your valuable feedback, question, or comments about this article are always welcome.
If you enjoyed and liked this post, don’t forget to share.