多变量赋值
# Assign values directly
a, b = 0, 1
assert a == 0
assert b == 1
# Assign values from a list
(r,g,b) = ["Red","Green","Blue"]
assert r == "Red"
assert g == "Green"
assert b == "Blue"
# Assign values from a tuple
(x,y) = (1,2)
assert x == 1
assert y == 2循环
#正常循环
for (index,file) in enumerate(os.listdir(base_path)):
# 想跳过
#只能while循环
