python 第一课

# *************python OO ******************************
class person:
        country='China'
        def __init__(self):
                self.name='karl'
                self.id=100001
        def say_id(self):
                print "%s's id is %d" % (self.name, self.id)

        def set_Country(self,cou):
                self.country=cou


me=person()
me.say_id()
me.set_Country('England')
print me.country


# *************file write *****************************
b_file=file('b.txt','w')
b_file.write('write a line in file')
b_file.write('write a line in file');
b_file.write('enter\n')
b_file.writelines(['billrice','ricerice'])
b_file.close()
b_file=file('b.txt','r')
b_content=b_file.read()
print b_content


# *************file read ******************************
a_file=file('a.txt','r')
a_content=a_file.read()
print a_content

b_file=file('a.txt','r')
for a_line in b_file.readlines():
        print 'Line:', a_line


# ************* method defination **********************
def square(x):
        return x**2

print square(5) # print 25

def swap(a,b):
        return (b,a)

print swap(3,5) # print (5,3)


# ************* while **********************************
i=0
n=0
while i<10:
        if i%2==0:
                n=n+i
        i=i+1
print n


# ************* input **********************************
your_name=raw_input("please input your name:")
hint="welcome! %s" % your_name
print hint

inputed_num=0
while 1:
        inputed_num=input("input a number between 1 and 10\n")
        if inputed_num>=10:
                pass
        elif inputed_num<1:
                pass
        else:
                break
print "OK"


# ************* list and dict ***************************
contact = {}
contact_list = []
while 1:
        contact['name'] = raw_input("please input name: ")
        contact['phone'] = raw_input("please input phone number: ")
        contact_list.append(contact.copy())
        go_on = raw_input("continue?\n")
        if go_on == "yes":
                pass
        elif go_on == "no":
                break
        else:
                print "you didn't say no\n"
i = 1
for contact in contact_list:
        print "%d: name=%s" % (i, contact['name'])
        print "%d: phone=%s" % (i, contact['phone'])
        i = i + 1


# *********** input() and raw_input()********************

print input("please input 1+2: ")       # when input 1+2, then print 3
print raw_input("please input 1+2: ")   # when input 1+2, then print 1+2


# *********** Exception *********************************


try:
        print input()   # when input 1/0, then will thow a exception
except:
        print 'there is an error in your input'