with open(‘explore.txt‘, ‘a‘, encoding=‘utf-8‘) as file:
    file.write(‘\n‘.join([question, author, answer]))
    file.write(‘\n‘ + ‘=‘ * 50 + ‘\n‘)

import json
 
str = ‘‘‘
[{
    "name": "Bob",
    "gender": "male",
    "birthday": "1992-10-18"
}, {
    "name": "Selina",
    "gender": "female",
    "birthday": "1995-10-18"
}]
‘‘‘
print(type(str))
data = json.loads(str)
print(data)
print(type(data))

import json
 
data = [{
    ‘name‘: ‘Bob‘,
    ‘gender‘: ‘male‘,
    ‘birthday‘: ‘1992-10-18‘
}]
with open(‘data.json‘, ‘w‘) as file:
    file.write(json.dumps(data))

import csv
 
with open(‘data.csv‘, ‘w‘) as csvfile:
    writer = csv.writer(csvfile, delimiter=‘ ‘)
    writer.writerow([‘id‘, ‘name‘, ‘age‘])
    writer.writerow([‘10001‘, ‘Mike‘, 20])
    writer.writerow([‘10002‘, ‘Bob‘, 22])
    writer.writerow([‘10003‘, ‘Jordan‘, 21])

import csv
 
with open(‘data.csv‘, ‘r‘, encoding=‘utf-8‘) as csvfile:
    reader = csv.reader(csvfile)
    for row in reader:
        print(row)

import pymysql
# connect()方法声明一个MySQL连接对象
db = pymysql.connect(host=‘localhost‘,user=‘root‘, password=‘123456‘, port=3306)
# cursor()方法获得MySQL的操作游标，利用游标来执行SQL语句
cursor = db.cursor()
# 创建students数据表
sql = ‘CREATE TABLE IF NOT EXISTS students (id VARCHAR(255) NOT NULL, name VARCHAR(255) NOT NULL, age INT NOT NULL, PRIMARY KEY (id))‘
cursor.execute(sql)

import pymysql
 
id = ‘20120001‘
user = ‘Bob‘
age = 20
 
db = pymysql.connect(host=‘localhost‘, user=‘root‘, password=‘123456‘, port=3306, db=‘spiders‘)
cursor = db.cursor()
sql = ‘INSERT INTO students(id, name, age) values(%s, %s, %s)‘
try:
    cursor.execute(sql, (id, user, age))
    db.commit()
except:
    db.rollback()
db.close()
==================================================================================================
data = {
    ‘id‘: ‘20120001‘,
    ‘name‘: ‘Bob‘,
    ‘age‘: 20
}
table = ‘students‘
keys = ‘, ‘.join(data.keys())
values = ‘, ‘.join([‘%s‘] * len(data))
sql = ‘INSERT INTO {table}({keys}) VALUES ({values})‘.format(table=table, keys=keys, values=values)
try:
   if cursor.execute(sql, tuple(data.values())):
       print(‘Successful‘)
       db.commit()
except:
    print(‘Failed‘)
    db.rollback()
db.close()

sql = ‘UPDATE students SET age = %s WHERE name = %s‘
try:
   cursor.execute(sql, (25, ‘Bob‘))
   db.commit()
except:
   db.rollback()
db.close()
===========================================================================================================================
data = {
    ‘id‘: ‘20120001‘,
    ‘name‘: ‘Bob‘,
    ‘age‘: 21
}
 
table = ‘students‘
keys = ‘, ‘.join(data.keys())
values = ‘, ‘.join([‘%s‘] * len(data))
 
sql = ‘INSERT INTO {table}({keys}) VALUES ({values}) ON DUPLICATE KEY UPDATE‘.format(table=table, keys=keys, values=values)
update = ‘,‘.join([" {key} = %s".format(key=key) for key in data])
sql += update
try:
    if cursor.execute(sql, tuple(data.values())*2):
        print(‘Successful‘)
        db.commit()
except:
    print(‘Failed‘)
    db.rollback()
db.close()

table = ‘students‘
condition = ‘age > 20‘
 
sql = ‘DELETE FROM  {table} WHERE {condition}‘.format(table=table, condition=condition)
try:
    cursor.execute(sql)
    db.commit()
except:
    db.rollback()
 
db.close()

sql = ‘SELECT * FROM students WHERE age >= 20‘
 
try:
    cursor.execute(sql)
    print(‘Count:‘, cursor.rowcount)
    one = cursor.fetchone()
    print(‘One:‘, one)
    results = cursor.fetchall()
    print(‘Results:‘, results)
    print(‘Results Type:‘, type(results))
    for row in results:
        print(row)
except:
    print(‘Error‘)

import pymongo
# 连接MongoDB
client = pymongo.MongoClient(host=‘localhost‘, port=27017)
# 指定数据库
db = client.test
# 指定集合(类似于数据表)
collection = db.students

student = {
    ‘id‘: ‘20170101‘,
    ‘name‘: ‘Jordan‘,
    ‘age‘: 20,
    ‘gender‘: ‘male‘
}

student1 = {
    ‘id‘: ‘20170101‘,
    ‘name‘: ‘Jordan‘,
    ‘age‘: 20,
    ‘gender‘: ‘male‘
}
 
student2 = {
    ‘id‘: ‘20170202‘,
    ‘name‘: ‘Mike‘,
    ‘age‘: 21,
    ‘gender‘: ‘male‘
}

result = collection.insert(student)
result = collection.insert([student1, student2])
result = collection.insert_many([student1, student2])
print(result)

# find_one()查询得到的是单个结果，find()则返回一个生成器对象。
result = collection.find_one({‘name‘: ‘Mike‘})
result = collection.find_all({‘name‘: ‘Mike‘})

condition = {‘name‘: ‘Kevin‘}
student = collection.find_one(condition)
student[‘age‘] = 25
result = collection.update(condition, student)
print(result)

# update_many()方法，则会将所有符合条件的数据都更新
# update_one()方法，则会将单个符合条件的数据都更新

# remove()将符合条件的所有数据删除
result = collection.remove({‘name‘: ‘Kevin‘})
print(result)
# delete_one()删除第一条符合条件的数据
result = collection.delete_one({‘name‘: ‘Kevin‘})
print(result)
print(result.deleted_count)
# delete_many()即删除所有符合条件的数据
result = collection.delete_many({‘age‘: {‘$lt‘: 25}})
print(result.deleted_count)
# deleted_count属性获取删除的数据条数

from redis import StrictRedis
 
redis = StrictRedis(host=‘localhost‘, port=6379, db=0, password=‘foobared‘)
redis.set(‘name‘, ‘Bob‘)    
print(redis.get(‘name‘))