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is not None 判断
列表不为空
list_1 = []
if list_1 is not None:
print('list is not none')
列表为空
list_1 = []
if list_1[0] is None:
print('list_1 is none')
if 列表判断
列表不为空(空列表等于 False)
list_2 = []
if list_2:
print('list_2 is not none')
length列表长度判断
列表为空
list_3 = []
if len(list_3) == 0:
print('list_3 is none')
list_3 = []
if len(list):
print('list_3 is not none')
来自 “ ITPUB博客 ” ,链接:https://blog.itpub.net/2387/viewspace-2836580/ ,如需转载,请注明出处,否则将追究法律责任。