Python实现两个list对应元素相减操作

# coding=gbk

v1=[21,34,45]

v2=[55,25,77]

#v = v2 - v1      # Error: TypeError: unsupported operand type(s) for -: 'list' and 'list'

v=list(map(lambdax: x[0]-x[1],zip(v2, v1)))

print("%s\n%s\n%s"%(v1, v2, v))

E:\Program\Python>del.py

[21,34,45]

[55,25,77]

[34,-9,32]

#!/bin/env python

importshutil, sys, os

darray=[

  "Entering directory",

  "In function ",

  "Leaving directory",

  "__NR_SYSCALL_BASE",

  "arm-hisiv100-linux-ar ",

  "arm-hisiv100-linux-gcc ",

  "but argument is of type",

  "dereferencing type-punned pointer will break strict-aliasing rules",

  "differ in signedness",

  "does break strict-aliasing rules",

  "embedded '\\0' in format",

  "excess elements in array initializer",

  "implicit declaration of",

  "make -C ",

  " rm -f",

  "this is the location of the previous definition",

  "warning: multi-line comment"

]

defisInArray (array, line):

  foriteminarray:

    ifiteminline:

      returnTrue

  returnFalse

if__name__=='__main__':

  argv=sys.argv

  argc=len(argv)

  ifargc<2:

    print"Usage: %s"%(os.path.basename(argv[0]))

    exit()

  fname=argv[1]

  fresult=fname+".result"

  withopen(fname,'r') as f:

    withopen(fresult,'w') as g:

      forlineinf.readlines():

        ifnotisInArray(darray, line):

          g.write(line)

db=pymysql.connect(...)

cur=db.cursor()

cur.execute(sql)

print(cur.description)

result=cur.fetchall()

data_dict=[]

forfieldincur.description:

  data_dict.append(field[0])

print(data_dict)

def__init__(self, connection):

  self.connection=connection

  self.description=None

  self.rownumber=0

  self.rowcount=-1

  self.arraysize=1

  self._executed=None

  self._result=None

  self._rows=None

  self._warnings_handled=False

try{

    $pdo=newPDO('mysql:host=localhost;dbname=alpha','root','password');

}catch(PDOException$e){

    echo"数据库连接失败，原因是：".$e->getMessage();

}

//从数据库中选择数据，并将结果赋予一个变量,testtable为数据库表

$result=$pdo->query('select id,name,age from testtable');

//将查询出的数据输出

while($row=$result->fetch()){

    echo"ID:".$row['id'];

    echo"NAME:".$row['name'];

    echo"AGE:".$row['age'];

}

?>