多个装备，多个爱好，多门课程，多个女朋友等
定义：[]内可以有多个任意类型的值，逗号分隔
my_girl_friends=['alex','wupeiqi','yuanhao',4,5] #本质my_girl_friends=list([...])
print(list('hello'))
print(int('123'))
print(str(123))
优先掌握的操作：
按索引存取值(正向存取+反向存取)：即可存也可以取
my_girl_friends=['alex','wupeiqi','yuanhao',4,5]
切片(顾头不顾尾，步长)
长度
print(my_girl_friends.__len__())
print(len(my_girl_friends))
成员运算in和not in
print('wupeiqi' in my_girl_friends)
追加
my_girl_friends[5]=3 #IndexError: list assignment index out of range
my_girl_friends.append(6)
print(my_girl_friends)
删除
my_girl_friends=['alex','wupeiqi','yuanhao',4,5]
单纯的删除
del my_girl_friends[0]
print(my_girl_friends)
res=my_girl_friends.remove('yuanhao')
print(my_girl_friends)
print(res)
print(my_girl_friends)
删除并拿到结果:取走一个值
res=my_girl_friends.pop(2)
res=my_girl_friends.pop()
print(res)
my_girl_friends=['alex','wupeiqi','yuanhao',4,5]
print(my_girl_friends.pop(0)) #'alex'
print(my_girl_friends.pop(0)) #'wupeqi'
print(my_girl_friends.pop(0)) #'yuanhao'
循环
my_girl_friends=['alex','wupeiqi','yuanhao',4,5]
i=0
while i < len(my_girl_friends):
print(my_girl_friends[i])
i+=1
for item in my_girl_friends:
print(item)
for i in range(10):
if i== 3:
break
# continue
print(i)
else:
print('===>')
掌握的方法
my_girl_friends=['alex','wupeiqi','yuanhao','yuanhao',4,5]
my_girl_friends.insert(1,'egon')
print(my_girl_friends)
my_girl_friends.clear()
print(my_girl_friends)
l=my_girl_friends.copy()
print(l)
print(my_girl_friends.count('yuanhao'))
l=['egon1','egon2']
my_girl_friends.extend(l)
my_girl_friends.extend('hello')
print(my_girl_friends)
my_girl_friends=['alex','wupeiqi','yuanhao','yuanhao',4,5]
print(my_girl_friends.index('wupeiqi'))
print(my_girl_friends.index('wupeiqissssss'))
my_girl_friends.reverse()
my_girl_friends=['alex','wupeiqi','yuanhao','yuanhao',4,5]
my_girl_friends.reverse()
print(my_girl_friends)
l=[1,10,4,11,2,]
l.sort(reverse=True)
print(l)
x='healloworld'
y='he2'
print(x > y)
l=['egon','alex','wupei']
l.sort()
print(l)