a = 'Hello'
print(a[0])
print(a[-5])
print(a[4])
print(a[-1])

print(max(a))
print(min(a))
print(len(a))

a = 'Hello'
b = a*2
print(b)
a *= 2
print(a)
a = 'Hello' + ','
print(a)
a += 'World'
print(a)
a = 'Hello'
print(a[1:3])
print(a[:3])
print(a[0:3])
print(a[0:])
print(a[0:5])
print(a[:])
print(a[1:-1])
a = 'Hello'
print('e' in a)
print('E' not in a)

e =[20,10,50,30]
d =[]
c =['Hello','World',1,2,3]
a = [10,]
b =list('Hello')
print(a,b,c,d,e)
list1 = [20,10,50,30] 
list1.append(80)
print(list1)
t = [1,2,3]
list1 += t
print(list1)
list1 = [20,10,50,30]
list1.extend(t)
print(list1)
list1 = [20,10,50,30]
list1.insert(2,80)
print(list1)
list1 = [20,10,50,30]
list1[1] = 80
print(list1)
list1 = [20,10,80,50,30]
list1.remove(80)
print(list1)

print((21,32,43,45,))
print(('Hello','World'))
print(('Hello','World',1,2,3))
print(tuple('Hello'))
print(tuple([21,32,43,45]))
t = 1,
print(t)
print(type(t))
t = (1,)
print(type(t))
a = ()
print(type(a))

s_id,s_name = (102,'张三')
print(s_id)
print(s_name)

print(set('Hello'))
print({20,15,10,30,20,15})
b = {}
print(type(b))
s_set = {'张三','李四','王五'}
s_set.add('董六')
print(s_set)
s_set.remove('李四')
print('李四' in s_set)
print(s_set)
s_set.clear()
print(s_set)

print(dict({102:'张三',105:'李四',109:'王五'})) #参数是另一个字典
print(dict(((102,'张三'),(105,'李四'),(109,'王五')))) #参数是元组
print(dict([(102,'张三'),(105,'李四'),(109,'王五')])) #参数是列表
print(dict(zip([102,105,109],['张三','李四','王五']))) #将两个可迭代对象打包成元组
dict1 = {102:'张三',105:'李四',109:'王五'}
print(dict1)
dict1 = {}
print(dict1)

dict1 = {102:'张三',105:'李四',109:'王五'}
print(dict1[109])
dict1[110] = '董六'
print(dict1)
dict1[109] = '张三'
print(dict1)
print(dict1.pop(105))
print(dict1)


dict1 = {102:'张三',105:'李四',109:'王五'}

print(dict1.items())
print(list(dict1.items()))
print(dict1.keys())
print(list(dict1.keys()))
print(dict1.values())
print(list(dict1.values()))


s_dict = {102:'张三',105:'李四',109:'王五'}

print('---遍历键---')
for s_id in s_dict.keys():
    print('学号: ' + str(s_id))

print('---遍历值---')
for s_name in s_dict.values():
    print('学生: ' + s_name)

print('---遍历键:值')
for s_id,s_name in s_dict.items():
    print('学号: {0} - 学生: {1}'.format(s_id,s_name))