I am not python expert, but got hurt by passing dictionary as
optional argument.
Session:
In [1]: def f(n,a,ca={}):
...: for i in range(n):
...: ca[i+a]=i+a
...: print(i,"len(cac)",len(ca))
...:
In [2]: f(2,2)
0 len(cac) 1
1 len(cac) 2
In [3]: f(2,4)
0 len(cac) 3
1 len(cac) 4
What is the scientific way to avoid `0 len(cac) 3`?
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