1.提取data.json中的数据，将每条数据中的name、text、love和comment信息。并且保存到另外一个json文件中
import json
with open('./files/data.json', 'r', encoding='utf-8') as f:
contents = json.load(f)
data = contents['data']
f.close()
list1 = []
for msg in data:
new_data = {'name': msg['name'], 'text': msg['text'], 'love': msg['love'], 'comment': msg['comment']}
list1.append(new_data)
with open('./files/new_data.json', 'w', encoding='utf-8') as f:
json.dump(list1, f, ensure_ascii=False, indent=4)
f.close()
2.统计data.json中comment数量超过1000的个数
import json
with open('./files/data.json', 'r', encoding='utf-8') as f:
contents = json.load(f)
data = contents['data']
f.close()
count = 0
for msg in data:
if int(msg['comment']) > 1000:
count += 1
print(count)
3.将data.json文件中所有点赞数(love)对应的值超出1000的用k来表示，例如1000修改为1k, 1345修改为1.3k
import json
with open('./files/data.json', 'r', encoding='utf-8') as f:
contents = json.load(f)
data = contents['data']
f.close()
for msg in data:
if int(msg['love']) >= 1000:
msg['love'] = str(round(int(msg['love'])/1000, 1)) + 'k'
with open('./files/data.json', 'w', encoding='utf-8') as f:
json.dump(contents, f, ensure_ascii=False, indent=4)
f.close()
4.写猜数字游戏，如果输入有误，提示重新输入，直达输入正确为止。比如：输入数字的时候没有按要求输入，提示重新输入
import random
num = random.randint(0,100)
try:
num1 = int(input('请输入数字(0-100):'))
while True:
if num1 == num:
print('恭喜你，猜对了！！！')
break
else:
if num1 > num:
print('大了，再小点！')
num1 = int(input('请重新猜:'))
else:
print('小了，再大点！')
num1 = int(input('请重新猜:'))
except ValueError:
num1 = int(input('您的输入有误，请重新输入:'))
运行结果：
请输入数字(0-100):aa
您的输入有误，请重新输入:
5.写学生管理系统的添加学生功能(数据需要本地化)，要求除了保存学生的基本信息以外还要保存学生的学号，但是学号需要自动生成
生成原则：
添加第一个学生对应的学号是:py001 第二次添加的学生的学号是:py002 ... 如果前面的学生因为各种原因被移除了，那后面添加学生的时候原则不变，就是比如上次已经添加到py012,那么前面不管有没有删除情况，再次添加学生的学号是py013
import json
key_students = 'students'
key_number = 'number'
key_name = 'name'
key_age = 'age'
key_tel = 'tel'
key_id = 'id'
def read_data(filename):
try:
with open('./files/'+filename, 'r', encoding='utf-8') as f:
return json.load(f)
except:
return None
def write_data(filename,contents):
try:
with open('./files/'+filename, 'w', encoding='utf-8') as f:
json.dump(contents, f, ensure_ascii=False, indent=4)
return True
except:
return False
def get_system_info():
system_info = read_data('stu.json')
if system_info:
return system_info
else:
return {}
def create_id():
system_info = get_system_info()
number = system_info.get(key_number,0)
number += 1
id = 'python' + str(number).rjust(3,'0')
return id,number
while True:
print('===================')
print('1.添加学生\n2.退出')
print('===================')
value = input('请选择:')
if value == '1':
name = input('请输入学生名字:')
age = input('请输入学生年龄:')
tel = input('请输入学生电话:')
id,number = create_id()
stu = {key_name:name, key_age:age, key_id:id, key_tel:tel}
# 保存学生信息
system_info = get_system_info()
students = system_info.get(key_students,[])
students.append(stu)
# 保存到文件中
system_info[key_students] = students
system_info[key_number] = number
re = write_data('stu.json',system_info)
if re:
print('添加成功！')
else:
print('添加失败！')
elif value == '2':
break
else:
continue
