python之基础知识点

'''
@author:wusen
time :2020-02-28 10:12:41
'''

# =============================================================================
#     Ctrl + 1: 注释/反注释
# 
# 　　Ctrl + 4/5: 块注释/块反注释
#       '''和"""都可以注释
# =============================================================================

#获取当前时间
import datetime
now_time=datetime.datetime.now()
time=now_time.strftime("%Y-%m-%d %H:%M:%S")
print(time)

#变量        变量区分大小写 
#global animal="动物"  在函数内部创建为全局变量
animal1,animal2,animal3="小狗","小猫","小羊"
print(animal3)

#数据类型转换
animal4="4"
#强制转换
print(type(int(animal4)))

#int float complex复数
num1=2j
print(num1)
print(type(num1))
#随机数 random
import random
print(random.randrange(1,10))

#'''和"""也是多行字符串位置
str1="""2020年
    加油!
"""
print(str1)

#bool(7>6)布尔类型

#运算符


#列表可以表示数组（python没有数组）
fruit=["香蕉","apple",12]
print(fruit[1])
print(len(fruit))
fruit.append("wusen")
fruit.pop(1)
fruit.remove(12)
print(fruit)

#元组
#不可修改。
#元组之间可以相加
name=("wusen","吴森",12,12)
print(name.count(12))

#集合  是无序的，不可修改，可以增加，删除
animal={"wusen","吴森","3可贼",12}
animal.add(14)

#字典
sex={
     "wusen":"男",
     "xiaohong":"女",
     "xiaobai":12,
     "xiaohei":12
     }

print(sex.get("xiaobai"))


city=("邢台","石家庄","保定","邯郸","衡水","廊坊","秦皇岛","唐山")

j=range(1,100,3)
arr={0:0,}
for i in range(1,20):
        arr[i]=j[i]

for i ,j in arr.items():
    print(i,j)
        
for i in arr:
    print(i,arr[i])
    
i=0
j=1
while i<9:
    i=i+1
    j=1
    while j<=i:
#        print("%dX%d=%d" %(i,j,i*j),end=" ")
        print((i,j),end="")
        j=j+1
    print("")
    
    
#函数 def
def demoprint(a):
        print("第",a,"遍新年快乐")
        
for i in range(1,10):
    if i!=7:
        demoprint(i)
    else:
        continue
else:
    print("结束")
    
#lambda函数
sum=lambda a,b:a+b
sum(1,2)

def my_f(a):
    return lambda b:a*b
my=my_f(5)
my(50)
        
        

#类
class people:
    def __init__(self,name,age):
        self.name=name
        self.age=age
        
    def myname(self):
        print("My name is",self.name)
        
I=people("吴森",24)
I.myname()
        

import mysql.connector
mydb = mysql.connector.connect(
  host="localhost",
  user="root",
  passwd="123456"
)

print(mydb)

#数据库(大小写好像没事)
import mysql.connector
mydb=mysql.connector.connect(
        host="localhost",
        user="root",
        passwd="123456"
        )
mycursor=mydb.cursor()
mycursor.execute("CREATE DATABASE mydatabase")

#输出数据库
import mysql.connector
mydb=mysql.connector.connect(
        host="localhost",
        user="root",
        passwd="123456"
        )
mycursor=mydb.cursor()
mycursor.execute("SHOW DATABASES")
#print(mycursor)
for x in mycursor:
    print(x)
    

import mysql.connector
mydb=mysql.connector.connect(
        host="localhost",
        user="root",
        passwd="123456",
        database="mydatabase"
        )
mycursor=mydb.cursor()
#mycursor.execute("CREATE TABLE customers(name VARCHAR(255), address VARCHAR(255))")
#                  ALTER TABLE customers ADD COLUMN id INT AUTO_INCREMENT PRIMARY KEY
mycursor.execute("ALTER TABLE customers ADD COLUMN id INT AUTO_INCREMENT PRIMARY KEY")
mycursor.execute("show tables")
for x in mycursor:
    print(x)
    
import mysql.connector

mydb = mysql.connector.connect(
  host="localhost",
  user="root",
  passwd="123456",
  database="mydatabase"
)

mycursor = mydb.cursor()

sql = "INSERT INTO customers (name, address) VALUES (%s, %s)"
val = ("John", "Highway 21")
mycursor.execute(sql, val)

mydb.commit()

print(mycursor.rowcount, "record inserted.")

import mysql.connector
mydb=mysql.connector.connect(
        host="localhost",
        user="root",
        passwd="123456",
        database="mydatabase"
        )
mycursor=mydb.cursor()
sql="INSERT INTO customers (name,address) VALUES (%s,%s)"
val=("曹操","东汉末年")
mycursor.execute(sql,val)
mydb.commit()
    


import mysql.connector
mydb=mysql.connector.connect(
        host="localhost",
        user="root",
        passwd="123456",
        database="mydatabase"
        )
mycursor=mydb.cursor()
mycursor.execute("SELECT * FROM CUSTOMERS")
myresult=mycursor.fetchall()
for x in myresult:
    print(x)
    
    










#批量插入
def myinsert(vals):
    import mysql.connector
    mydb=mysql.connector.connect(
            host="localhost",
            user="root",
            passwd="123456",
            database="mydatabase"
            )
    mycursor=mydb.cursor()
    sql="INSERT INTO customers (name ,address) VALUES(%s,%s)"
    
    for val in vals:
         mycursor.execute(sql,val)
   
    mydb.commit()
        





import openpyxl
wb=openpyxl.load_workbook("E:\data.xlsx")

sheets = wb.sheetnames
print(sheets, type(sheets))

ws=wb["Sheet1"]


print(ws["A1"].value)
i=1
while i<=ws.max_row:
    s="A"+str(i)
    print(ws[s].value)
    i=i+1


for x in ws[3]:
    print(x)

col_range = ws["A":"B"]
row_range = ws[1:4]
 
for col in col_range: # 打印BC两列单元格中的值内容
    for cell in col:
        print(cell.value)
 
for row in row_range: # 打印 2-5行中所有单元格中的值
    for cell in row:
        print(cell.value)




print("A"+str(1))






s=input("请输入：")
print(s)


#发邮件
#email构建邮件
#smtplib发送邮件
#!/usr/bin/python
# -*- coding: UTF-8 -*-
 
import smtplib
from email.mime.text import MIMEText
from email.header import Header
 
sender = 'from@runoob.com'
receivers = ['2096706824@qq.com']  # 接收邮件，可设置为你的QQ邮箱或者其他邮箱
 
mail_msg = """
<p>Python 邮件发送测试...</p>
<p><a href="http://www.runoob.com">这是一个链接</a></p>
"""
message = MIMEText(mail_msg, 'html', 'utf-8')
message['From'] = Header("菜鸟教程", 'utf-8')
message['To'] =  Header("测试", 'utf-8')
 
subject = 'Python SMTP 邮件测试'
message['Subject'] = Header(subject, 'utf-8')
 
 
try:
    smtpObj = smtplib.SMTP('localhost')
    smtpObj.sendmail(sender, receivers, message.as_string())
    print "邮件发送成功"
except smtplib.SMTPException:
    print "Error: 无法发送邮件"



import smtplib

server = smtplib.SMTP()
server.connect(host, port)
server.login(username, password) 
server.sendmail(from_addr, to_addr, msg.as_string()) 
server.quit() 



#成功发送
import smtplib
from email.mime.text import MIMEText

from_addr='2096706824@qq.com'
password="nmckgeilsckzcghg"
to_addr="2376502463@qq.com"
smtp_server="smtp.qq.com"
msg=MIMEText("python","plain","utf-8")

server=smtplib.SMTP()
server.connect(smtp_server,25)
server.login(from_addr,password)


server.sendmail(from_addr,to_addr,msg.as_string())
server.quit()

print("结束")
#发送邮件

import smtplib
from email.mime.text import MIMEText
from_addr="2096706824@qq.com"
password="nmckgeilsckzcghg"
to_addr="2376502463@qq.com"
smtp_server="smtp.qq.com"
msg=MIMEText("python","plain","utf-8")
i=1;
while i<10:
    server=smtplib.SMTP()
    server.connect(smtp_server,25)
    server.login(from_addr,password)
    server.sendmail(from_addr,to_addr,msg.as_string())
    server.quit()
    i=i+1