[Python-Dev] Should vars() return modifiable dict? (original) (raw)

Serhiy Storchaka storchaka at gmail.com
Wed Oct 3 10:54:28 CEST 2012

For objects with dict vars() returns modifiable dict:

class A(): ... pass ... a = A() a.x = 42 vars(a) {'x': 42} vars(a)['x'] = 43 vars(a)['y'] = 44 a.x, a.y, vars(a) (43, 44, {'y': 44, 'x': 43})

For globals vars() returns modifiable dict:

x = 42 vars()['x'] 42 vars()['x'] = 43 vars()['y'] = 44 vars()['x'], vars()['y'] (43, 44)

For locals vars() returns... hmm, partially modifiable dict:

def f(): ... x = 42 ... print(vars()) ... vars()['x'] = 43 ... vars()['y'] = 44 ... print(x, vars()) ... f() {'x': 42} 42 {'y': 44, 'x': 42}

Should behavior of vars() be corrected for locals?

Should vars() for objects with slots [1] returns modifiable or non-modifiable dict?