Day1-python理论基础2

li = ["Merlin","li","sun","zhou","wu"]

>>> li[0:3]
[‘Merlin‘, ‘li‘, ‘sun‘]

>>> li[-1]　　#-1是最后一个
‘wu‘

>>> li[:3]　　#当不填数值时默认是从最开始或最后
[‘Merlin‘, ‘li‘, ‘sun‘]

>>> li[-3:-1]　　#如果是为从后取的时候需要注意 数字是从小到大
[‘sun‘, ‘zhou‘]

>>> li[:-1:2]　　#如果需要隔位选取的时候可以增加步长
[‘Merlin‘, ‘sun‘]

>>> li.append(‘aaa‘)
>>> li
[‘Merlin‘, ‘li‘, ‘sun‘, ‘zhou‘, ‘wu‘, ‘aaa‘]


>>> li.insert(0,‘bbb‘)
>>> li
[‘bbb‘, ‘Merlin‘, ‘li‘, ‘sun‘, ‘zhou‘, ‘wu‘, ‘aaa‘]

>>> li
[‘bbb‘, ‘Merlin‘, ‘li‘, ‘sun‘, ‘zhou‘, ‘wu‘, ‘aaa‘]
>>> li.remove("sun")
>>> li
[‘bbb‘, ‘Merlin‘, ‘li‘, ‘zhou‘, ‘wu‘, ‘aaa‘]

>>> li
[‘bbb‘, ‘Merlin‘, ‘li‘, ‘zhou‘, ‘wu‘, ‘aaa‘]
>>> li[1] = ‘wang‘
>>> li
[‘bbb‘, ‘wang‘, ‘li‘, ‘zhou‘, ‘wu‘, ‘aaa‘]

>>> li.index("li")
2

>>> li.count("li")
1

>>> li.sort()
>>> li
[‘aaa‘, ‘bbb‘, ‘li‘, ‘wang‘, ‘wu‘, ‘zhou‘]