lambda expression: default args

funcs = []
for i in range(5):
    funcs.append(lambda :print(i))

for f in funcs:
    f() # output 4 4 4 4 4


funcs = []
for i in range(5):
    funcs.append(lambda n = i :print(n))

for f in funcs:
    f() # output 0 1 2 3 4