python基础-1st step for python

#!/usr/bin/pythonXX

---means which version of python to create a program

# XXXXXXX

---means single notes ,for note

"""

XXXXXXXX

XXXX

XXX

"""

---means numbers notes,for note

arithmetic operator:

+,-

*,/

//,%----means9//2=4,9%2=1

**---means 2**3=8

type(X)   

---show the type of parement X

raw_input() 

input()

---intput one number or string from keboard

print("%s"%XX)

---instead of XX

if sentence :

    print

elif sentence :

    print

else :

    print

while:

i=1

while i<10 :

    q=1

    while q<i :

        print("%d * %d = %d"%(i,q,i*q),end="/t")

        q +=1

    i+=1

for:

for i in list :

    print(i)

for i in range(1,20):

    print(i)

if the for end with nothing(not the break) ,there is else-function start

for i in list :

    print

    if :

    break 

else :

    print

import random

a = random.randint(X,XX)

from __future__ import print_function

print('123123', end='')

python version 2.7 need import ;need not to get a new line ,and means the line end with the parameter of "end"