1.4 - 数据类型/字符编码练习题

1.可变数据类型： list dict set
2.不可变数据类型： 数字类（bool int float complex） str tuple(元祖) frozenset(不可变集合)

# 1.下划线将列表拼接成字符串
li = ['alex', 'eric', 'rain']
s = '_'.join(li)
print(s)

# 2.移除空格 并以a A 开头 c 结尾得元素
li = ["alec", " aric", "Alex", "Tony", "rain"]
li_new = []
tu = ("alec", " aric", "Alex", "Tony", "rain")
dic = {'K1': "alex", 'K2': ' aric', "K3": "Alex","K4": "Tony"}

for i in li:
    if i.strip().startswith('a') or i.strip().startswith('A') and i.strip().endswith('c'):
        li_new.append(i.strip())
print(li_new)

for i in tu:
    if i.strip().startswith('a') or i.strip().startswith('A') and i.strip().endswith('c'):
        print(i.strip())

for i in dic:
    if dic[i].strip().startswith('a') or dic[i].strip().startswith('A') and dic[i].strip().endswith('c'):
        print(dic[i].strip())

# 3. 实现每一个功能
li = ['alex', 'eric', 'rain']
print(len(li))
li.append("seven")
print(li)
li.insert(0, 'Tony')
print(li)
li[1] = 'Kelly'
print(li)
li.remove('eric')
print(li)
print(li.pop(1))
print(li)
del li[2]
print(li)
temp = [1,2,3,4,5,6,5,4,3,2,1,0]
print(temp)
del temp[2:4]
print(temp)
temp.reverse()
print(temp)
for index in range(len(li)):
    print(index,li[index])
for index,i in enumerate(li):
    print(index,i)
for index, i in enumerate(li,100):
    print(index, i)
for i in li:
    print(i)

# 4.实现每一个功能
li = ["hello", 'seven', ["mon", ["h", "kelly"], 'all'], 123, 446]

print(li[2][1][1])
li[2][2] = 'ALL'
print(li)

# 5.实现每一个功能
tu = ('alex', 'eric', 'rain')

print(len(tu))
print(tu[1])
print(tu[1:3])
for i in tu:
    print(i)
for index in range(len(tu)):
    print(index,tu[index])
for index, i in enumerate(tu,10):
    print(index,i) 

# 6.实现功能
# 元祖得特性：元祖本身不可变，如果元祖中包含可变元素，这些可变元素可以改变
tu = ('alex', [11, 22, {"K1": 'V1', "K2": ["age", "name"], "K3": (11, 22, 33)}, 44])
print(tu)
# 1.第一个元素alex不可被修改
# 2.K2对应得值得类型是列表，可以被修改
# 3.K3对应得是元祖类型，不可被修改
tu[1][2]["K2"].append("seven")
print(tu)

# 7.字典 
dic = {'K1': 'V1', 'K2': 'V2', 'K3': [11, 22, 33]}

for i in dic.keys():
    print(i)
for i in dic.values():
    print(i)
for i in dic:
    print(i, dic[i])
dic['K4'] = 'V4'
print(dic)
print(dic.setdefault("K1", 'alex'))
print(dic)
dic['K1'] = 'alex'
print(dic)
dic['K3'].append(44)
print(dic)
dic['K3'].insert(0, 18)
print(dic)

# 8.转换 
s = 'alex'
print(s.split(' '))
print(tuple(s))
li = ["alex", 'seven']
print(tuple(li))
tu = ('Alex', 'Seven')
print(list(tu))
li = ["alex", 'seven']
li1= [10, 11]
print(dict(zip(li1,li)))
li = [[1,2],[2,2]]
print(dict(li))

# 9.元素分类：{'k1':大于66得值,'k2':小于66得值}
li = [11, 22, 33, 44, 55, 66, 77, 88, 99, 90]
dic = {}
dic['k1'] = li[-4:]
dic['k2'] = li[:5]
print(dic)

# 10.用户添加商品 选择商品 
li = ["手机", "电脑", "鼠标垫", "游艇"]

products = input("添加商品：")
li.append(products)
print(li)
index = int(input("商品序号："))
print(li[index])

# 11. 后期 用户交互 省市县 输入省显示下面得市内容
dic = {"河北": {"石家庄": ["鹿泉", "元氏"],
              "邯郸": ["永年", "涉县"]},
       "河南": {},
       "山西": {}}

while True:
    province = input("请输入省份，输入q时退出:").strip()
    if province is 'q':
        break
    elif not province in dic:
        print("输入得省有误！")
    else:
        # print(dic[province].keys())
        for city in dic.get(province):
            print(city)
        city = input("请输入市").strip()
        print(dic.get(province).get(city))

# 12. 布尔值是false得所有值
print(bool(False))
print(bool(None))
print(bool(0))
print(bool(""))
print(bool(()))
print(bool([]))
print(bool({}))

# 13.两个列表得比较：
L1 = [11, 22, 33]
L2 = [22, 33, 44]

print(set(L1).intersection(set(L2)))
print(set(L1).difference(set(L2)))
print(set(L2).difference(set(L1)))
print(set(L1).symmetric_difference(set(L2)))

# 14.利用for循环和range输出
li = []
for i in range(1,100):
    li.append(i)
print(li)
li.reverse()
print(li)
count = 0
while count < 20:
    print(count)
    count += 1

# 15.for和range输出9*9乘法表
for i in range(1, 10):
    for j in range(1, i+1):
        print("%d*%d=%d" % (i, j, i*j), end=" ")
    print()