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def f(x,l=):
for i in range(x):
l.append(i*i)
print(l)

f(2)
f(3,[3,2,1])
f(3)


[0, 1]
[3, 2, 1, 0, 1, 4]
#How this is possible?
[0, 1, 0, 1, 4]
Please explain

see
http://docs.python-guide.org/en/latest/writing/gotchas/
https://pythonconquerstheuniverse.wordpr...arguments/