Is it possible to declare variables without prior definition in Python?

In Python, variables do not require prior declaration or definition before use. You simply assign a value to a variable, and it is created automatically. For example:

x = 10  # variable x is created upon first assignment
print(x)  # will output 10

If you try to use a variable before assigning it, a NameError will occur. Thus, in Python, variables are declared dynamically upon first assignment.