1 C:\Users\miao>python -V
 2 Python 2.7.10
 3
 4 C:\Users\miao>python
 5 Python 2.7.10 (default, May 23 2015, 09:40:32) [MSC v.1500 32 bit (Intel)] on wi
 6 n32
 7 Type "help", "copyright", "credits" or "license" for more information.
 8 >>> print 'Hello,World!'
 9 Hello,World!
10 >>>exit()

1 #!/usr/bin python
2 #-*- coding:utf-8 -*-
3
4 print 'hello,world'
5 print '你好,世界!'

1 E:\软件\python\class_test\days1>python hello.py
2 hello,world
3 你好,世界!

1 #!/usr/bin python
2 #-*- coding:utf-8 -*-
3
4 print 'hello,world'
5 print "hello,world"
6
7 '''
8 print '你好,世界!'
9 '''

1 E:\软件\python\class_test\days1>python hello.py
2 hello,world
3 hello,world

 1 >>> print '''
 2 ... a
 3 ... b
 4 ... c
 5 ... d
 6 ... '''
 7
 8 a
 9 b
10 c
11 d
12
13 >>>

1 #!/usr/bin/env python
2 # -*- coding: utf-8 -*-
3
4 name = "alex"

 1 >>> name1='wupeiqi'
 2 >>> name2=name1
 3 >>> name1
 4 'wupeiqi'
 5 >>> name2
 6 'wupeiqi'
 7 >>> name1='123'
 8 >>> name1
 9 '123'
10 >>> name2
11 'wupeiqi'
12 >>>

1 #!/usr/bin env python
2 #-*- coding:utf-8 -*-
3
4 name = raw_input("请输入用户名: ") 

1 E:\软件\python\class_test\days1>python flow_control_1.py
2 请输入你的名字: 你好

例一:#!/usr/bin env python
#-*- coding:utf-8 -*-import sys
#捕获参数
print sys.argv执行
E:\软件\python\class_test\days1>python capture_parameter.py localhost:8001
['capture_parameter.py', 'localhost:8001']例二:
#!/usr/bin python
#-*- coding:utf-8 -*-import getpass
pwd = getpass.getpass(">>>")
print pwd执行
E:\软件\python\class_test\days1>python capture_parameter.py
>>>
123E:\软件\python\class_test\days1>python capture_parameter.py
>>>
wo de mi ma

例一:
#!/usr/bin env python
#-*- coding:utf-8 -*-if name == 'alex':  print '你猜对了'
else:print '你输入的是啥啊?' 例二:
#!/usr/bin env python
#-*- coding:utf-8 -*-#if  else

name = raw_input("请输入你的名字: ")
if name == 'eric':print '普通'
elif name == 'tony':print '超级'
elif name == 'alex':print '超神'
else:print '你输入错误'

 1 >>> name = 1314
 2 >>> print type(name)
 3 <type 'int'>   ===>整型
 4 >>> name = 1.314
 5 >>> print type(name)
 6 <type 'float'>  ===>浮点型
 7 >>> 1=2
 8   File "<stdin>", line 1
 9 SyntaxError: can't assign to literal
10 >>> name1 =5
11 >>> name2 = 6
12 >>> name1 < name2
13 True           ===>布尔值
14 >>> name1 > name2
15 False

2.集合

name_list = ['alex','seven','eric']
或
name = list( ['alex','seven','eric'] )
例如:
>>> name_list[0]
'alex'
>>> name_list[-1]
'eric'

1 >>> name = ['wo','ai','ni']
2 >>> print type(name)
3 <type 'list'>    ===>列表

-----元组

4 >>> ages = (11,22,33)
5 >>> print type(ages)
6 <type 'tuple'>  ===>元祖

 1 #!/usr/bin/env python
 2 #-*- utf-8 -*-
 3
 4 person = {'name':'alex','age': 18,'gender': 'erci'}  ---->字典里面一个元素  .每一个元素都是由一个键值对组成
 5
 6 person['age'] = 20    ---》修改字典
 7 person['love'] = 'women'  ---》添加字典键值对
 8 del person['name']   ---》删除字典键值对
 9
10 print 'age is:',person['age']
11 print 'love is:',person['love']
12 print person  

1 E:\软件\python\class_test\days1>python dict.py
2 age is: 20
3 love is: women
4 {'gender': 'erci', 'age': 20, 'love': 'women'}

 1 name = 'i am %s' % 'alex'
 2 方式一:
 3 >>> name = 'i am %s,age %d' %('alex',63)
 4 >>> name
 5 'i am alex,age 63'
 6 方式二:
 7 >>> name = 'i am %s,age %d'
 8 >>> name %('alex',76)
 9 'i am alex,age 76'
10 方式三:
11 >>> name = 'i am {0},age{1}'
12 >>> name.format('alex',73)
13 'i am alex,age73'

 1 >>> name = 'alex'
 2 >>> name[0]
 3 'a'
 4 >>> name[1]
 5 'l'
 6 >>> name[2]
 7 'e'
 8 >>> name[3]
 9 'x'
10 >>> name[1:3] -->  这个3是不包含3的,是小于3的,<3
11 'le'
12 >>> name[0:] --> 表示到结尾
13 'alex'
14 >>> name[1:]
15 'lex'
16 >>> name[-1:] -->负1表示最后一个
17 'x'

 1 print name.strip() -->去掉两头空格
 2 print name.lstrip() -->去掉左边空格
 3 print name.rstrip() -->去掉右边空格
 4 例如:
 5 >>> print name.strip()
 6 alex
 7 >>> print name.lstrip()
 8 alex
 9 >>> print name.rstrip()
10    alex

1 >>> name_list1= ['alex','seven','eric']
2 >>> name_list2 = name_list1
3 >>> name_list1
4 ['alex', 'seven', 'eric']
5 >>> name_list1.append('miao')
6 >>> name_list1
7 ['alex', 'seven', 'eric', 'miao']
8 >>> name_list2
9 ['alex', 'seven', 'eric', 'miao']

 1 >>> name = 'zhongsguo'
 2 #把字符串分割成列表
 3 >>> name.split('s')
 4 ['zhong', 'guo']
 5 >>> name1 = name.split('s')
 6 >>> name1
 7 ['zhong', 'guo']
 8 #把列表合并成字符串
 9 >>> name2 = '_'.join(name1)
10 >>> name2
11 'zhong_guo'

1 #!/usr/bin/env python
2 # -*- coding:utf-8 -*-
3
4 name_list = ['alex', 'xiaoyueyue', 'wenqiang']
5 for ele in name_list:
6     print ele

二、加if条件的循环

1 #!/usr/bin/env python
2 # -*- coding:utf-8 -*-
3
4 name_list = ['alex', 'xiaoyueyue', 'wenqiang']
5 for ele in name_list:
6     if ele == "xiaoyueyue":
7         print "find"

三、如果我们要中断跳出整个循环，可以用break

1 #!/usr/bin/env python
2 # -*- coding:utf-8 -*-
3
4 name_list = ['alex', 'xiaoyueyue', 'wenqiang']
5 for ele in name_list:
6     if ele == "xiaoyueyue":
7         print "find"
8         break

四、如果我们要跳出当前条件的for循环，可以用continue

1 name_list = ['alex','yue','xiang']
2 for ele in name_list:
3     if ele == 'qyue':
4         print '找到你了'
5         continue       --->如果第一个没有找到,重新开始执行找第二个
6     if ele == 'alex':
7         print 'sp'
8         break

五、if...elif...else...嵌套循环

 1 #!/usr/bin env python2 #-*- coding:utf-8 -*-3 4 name1 = 'alex'5 name2 = 'eric'6 test = raw_input("请输入你的名字: ") 7 8 if test == name1:  9     print '你输入的名字是:',name1
10 elif test == name2:
11     print '你输入的名字是:',name2
12 else: 13 print '你输入的是啥啊?' 

结果如下：

 1 E:\软件\python\class_test\days1>python flow_control_1.py2 请输入你的名字: eric3 你输入的名字是: eric4 5 E:\软件\python\class_test\days1>python flow_control_1.py6 请输入你的名字: miao7 你输入的是啥啊? 8 9 E:\软件\python\class_test\days1>python flow_control_1.py 10 请输入你的名字: alex 11 你输入的名字是: alex 

基本的文件操作

 1 #!/usr/bin/env python
 2 # -*- coding:utf-8 -*-
 3
 4
 5 file_obj = open('E:\软件\python\class_test\days1\log.txt', 'r+')
 6 line_list = file_obj.readlines()
 7 my_list =[]
 8 for ele in line_list:
 9     line = ele.strip()
10     value_list = line.split(',')
11     last_value = int(value_list[-1])
12     last_value += 1
13     value_list[-1] = str(last_value)
14     value_str = ','.join(value_list)
15     my_list.append(value_str)
16 my_str = '\n'.join(my_list)
17 file_obj.seek(0)
18 file_obj.write(my_str)
19 #file_obj.flush()
20 file_obj.close()

 1 #!/usr/bin/env python
 2 # -*- coding:utf-8 -*-
 3
 4
 5 file_obj = file('E:\软件\python\class_test\days1\log.txt', 'r')
 6
 7 #print file_obj.readlines(),#将文件内容赋值给变量line_list
 8 line_list = file_obj.readlines()
 9 #新建一个列表,用来存放转换后结果
10 my_list =[]
11
12 for ele in line_list:
13     # 把line_list中的值去掉空格,然后赋给变量line
14     line = ele.strip()
15     #对line里面的内容,通过,分割成列表
16     value_list = line.split(',')
17     #对列表value_list切片取最后值,为了确保无误,我们对取值后的结果转换成整型
18     last_value = int(value_list[-1])
19     #按照要求加1
20     last_value += 1
21     #把加1后的列表last_value内容重新软件成字符串
22     value_list[-1] = str(last_value)
23     #我们通过合并参数join,用,把字符串转换成列表,并赋给变量value_str
24     value_str = ','.join(value_list)
25     #因为我们有好多行内容,所以把每次转换后的结果追加存入列表my_list中,方便直接调用
26     my_list.append(value_str)
27 #因为我们原来文件中的内容一行一条信息,所以我们新加入的信息加入换行符,并赋给变量my_str
28 my_str = '\n'.join(my_list)
29 #把最后更新的结果写入文件中
30 file_obj.write(my_str)
31 #清空缓存
32 file_obj.flush()
33 #关闭文件
34 file_obj.close()
35
36
37
38     

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