Python programming uses None instead of null.

1. Checking if the variable is not null [Method 1]


#variable
var = "hello python"

#check is not null
if var is not None:
    print('Var is not null')

output

Var is not null

2. Checking if the variable is not null [Method 2]


#variable
var = "hello python"

#check is not null
if var:
    print('Var is not null')

output

Var is not null

3. Checking if the variable is not null [Method 3]


test = "hello python"

# if variable is not null
if test != None :
    print('yes! the var is not null')
    

output

yes! the var is not null

Conclusion

All methods work perfectly, but method number 2 is the best way to check if a variable is not null (None)

English today is not an art to be mastered it's just a tool to use to get a result