Dynamic creation of variables and modification of globals()

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If I do this:

newvar = raw_input()
globals()[newvar] = 4

It is clear that the resulting variable is created at runtime, simply because it's the only possibility. However, if I do this:

globals()['y']=3

It seems that y is also created at runtime. Why is it the case? Where does the dynamic behavior come from?

PS: I am aware that this is a bad practice, I just want to understand.

asked 2 mins ago

usual me

1,232

Dynamic creation of variables and modification of globals()