如何删除列表citys中的所有元素?
列表 citys=[‘wh’,’bj’,’gz’,’sh’,’tj’]
1、
citys=['wh','bj','gz','sh','tj'] del citys[0:5] print(citys)
打印结果：[ ]
2、
citys=['wh','bj','gz','sh','tj'] del citys[-5:] print(citys)
打印结果：[ ]
3、
citys=['wh','bj','gz','sh','tj'] del citys[:] print(citys)
打印结果：[ ]
4、
citys=['wh','bj','gz','sh','tj'] citys1=['wh','bj','gz','sh','tj'] if citys: for city in citys1: citys.remove(city) print(citys)
打印结果：[ ]
5、
citys=['wh','bj','gz','sh','tj'] citys1=['wh','bj','gz','sh','tj'] if citys: for city in citys1: citys.remove(city) print(citys)
打印结果：
[‘bj’, ‘gz’, ‘sh’, ‘tj’]
[‘gz’, ‘sh’, ‘tj’]
[‘sh’, ‘tj’]
[‘tj’]
[ ]
