#编译方式，python3 文件名

#!/usr/bin/python3

#print('hello world')

 

mystring = 'hello world'

print (mystring)

 

 

#测试输入

#!\usr\bin\python3

num = input('Please enter an num :')

print ("now Doubling your num %d" % (int(num)*2))

 

#字符串和切片

#!/usr/bin/python3

pystr = 'Python'

iscool = 'is cool'

print ('pystr[0] is %s.' % pystr[0])

print ('pystr[2:5] is %s'% pystr[2:5])

 

 

#!/usr/bin/python3

#if test

count = 1

if count > 1:

    print ("test 1")

elif count == 1 :

    print ("test 2")

 

#while loop test

while count < 3:

    print("now count = %d" % count)

    count += 1

#for loop test

print("I like to use internet for:")

for item in ['e-mail', 'net-surfing', 'homework']:

    print(item,)

    print()

#range test

for eachNum in [0,1,2]:

     print(eachNum)

print('*'*4)

for eachNum in range(3):

     print(eachNum)

print('test for string','*'*4)

foo = 'abs'

for s in foo:

    print(s)

print('test of range and len')

for i in range(len(foo)):

    print (foo[i],'%d'%i)

squared = [x**2 for x in range(4)]

for i in squared:

    print(i)

 

#function test

def addMe2Me(x):

    'apply + operation to argument'

    return (x+x)

print(addMe2Me([2,'4']))

 

#default function param test

#!/usr/bin/python3

def foo(debug=True):

    if debug:

        print('cur in debug mode')

    else:

        print('cur in realse mode')

    print('done')

 foo(False)

 

#class test

#!/usr/bin/python3

class Myfoo(object):

    version = 0.1

    def __init__(self,nm='John Doe'):

        self.name = nm

        print('created a class instance for',nm)

        print('this is a ','test')

    def showname(self):

        print('your name is ', self.name)

    def showverison(self):

        print( self.version)

foo = Myfoo()