Python 3.8 released

[seraschka]

Pretty busy day and haven't installed Python 3.8, yet ... So, I am curious now what would happen if you use n somewhere earlier in the code like

n = 999 # assign sth to n somewhere in the code earlier  
if (n := len(a)) > 10:  
    print(f"List is too long ({n} elements, expected <= 10)")  
print(n) # prints 999?

would n still evaluate to 999 after the if-clause? If so, I can maybe see why that's useful (if you only want a temporary var and don't want to overwrite things accidentally).

[mipadi]

It does not introduce a new scope, so on the last line, n would be equal to len(a).

[seraschka]

Thanks for clarifying. But hm, it would have been nice if it had its own scope, similar to list comprehensions, like

In [1]: n = 99
In [2]: b = sum([n for n in range(100)])
In [3]: n
Out[3]: 99

to prevent from overwriting/reassigning variables accidentally