Python function

Question

def func(a,L=[]):
L.append(a)
return L
d=func(1)
print(d)
e=func(2)
print(d)

why is the output for the second print 1 2 instead of 1

i know that the e should be 1 2 but why does it also affect the d variable

Answer 1

if u use list...and appending to it then...it gets affected..
if u use variable like int etc. it wont get affacted..

Answer 2

The list L is saved in the function and will grow every time the function is called. To create a new empty list use this code:

def func(a):
L = []
L.append(a)
return L