from wsgiref.simple_server import make_server

# Every WSGI application must have an application object - a callable
# object that accepts two arguments. For that purpose, we're going to
# use a function (note that you're not limited to a function, you can
# use a class for example). The first argument passed to the function
# is a dictionary containing CGI-style environment variables and the
# second variable is the callable object (see PEP 333).
def hello_world_app(environ, start_response):
    status = '200 OK'  # HTTP Status
    headers = [('Content-type', 'text/plain; charset=utf-8')]  # HTTP Headers
    start_response(status, headers)

    # The returned object is going to be printed
    return [b"Hello World"]

httpd = make_server('', 8000, hello_world_app)
print("Serving on port 8000...")

# Serve until process is killed
httpd.serve_forever()

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
  PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
  "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">

<generatorConfiguration>
  <classPathEntry location="/Program Files/IBM/SQLLIB/java/db2java.zip" />

  <context id="DB2Tables" targetRuntime="MyBatis3">
    <jdbcConnection driverClass="COM.ibm.db2.jdbc.app.DB2Driver"
        connectionURL="jdbc:db2:TEST"
        userId="db2admin"
        password="db2admin">
    </jdbcConnection>

    <javaTypeResolver >
      <property name="forceBigDecimals" value="false" />
    </javaTypeResolver>

    <javaModelGenerator targetPackage="test.model" targetProject="\MBGTestProject\src">
      <property name="enableSubPackages" value="true" />
      <property name="trimStrings" value="true" />
    </javaModelGenerator>

    <sqlMapGenerator targetPackage="test.xml"  targetProject="\MBGTestProject\src">
      <property name="enableSubPackages" value="true" />
    </sqlMapGenerator>

    <javaClientGenerator type="XMLMAPPER" targetPackage="test.dao"  targetProject="\MBGTestProject\src">
      <property name="enableSubPackages" value="true" />
    </javaClientGenerator>

    <table schema="DB2ADMIN" tableName="ALLTYPES" domainObjectName="Customer" >
      <property name="useActualColumnNames" value="true"/>
      <generatedKey column="ID" sqlStatement="DB2" identity="true" />
      <columnOverride column="DATE_FIELD" property="startDate" />
      <ignoreColumn column="FRED" />
      <columnOverride column="LONG_VARCHAR_FIELD" jdbcType="VARCHAR" />
    </table>

  </context>
</generatorConfiguration>

first, _ = ("Ein", "Verne")

>>> record = ('ACME', 50, 3.14, (06,04,1989))
>>> name, *_, (*_, year) = record

l[1:3]              # 结果 [1,2]  左边包括，右边不包括
l[:5]               # [0,1,2,3,4]  不包括 index 为 5 的值
l[5:]               # [5,6,7,8,9]
l[-5:]              # 取后 5 个 [5,6,7,8,9]
l[:-4]              # 除了后四位，输出 [0,1,2,3,4,5]

l[1:5:2]            # 从第 1 位到第 5 位，不包括 5 位，每次前进 2 个，结果 [1,3]
l[:5:1]             # 从第 0 个取到第 5 个，不包括第 5 位，每次前进 1，输出 [0,1,2,3,4]
l[5::1]             # 从 index 5 取值到最后，每次进一位，输出 [5,6,7,8,9]

l[::-1]             # 逆序输出所有的元素
l[-1:-5:-1]         # 第 -1 位到第 -5 位，不包括第 -5 位，每次往前一位，所以为 [9,8,7,6]
l[-1::-1]           # 从最后一位开始，每次往前一位，直到最前面 输出 [9,8,7,6,5,4,3,2,1,0]
l[5::-1]            # 可以怎么理解，从序号 5 开始，每次往前一位，直到最后，所以输出 [5,4,3,2,1,0]

l[:5:-1]            # 因为省略了开头，所以需要看 step 正负，这里为 -1，所以从最后一位往前直到 index 为 5，所以输出 [9,8,7,6]

# Python 2

>>> print type("Hello World!")
<type 'str'>
# this is a byte string

>>>print type(u"Hello World!")
<type 'unicode'>
# this is a Unicode string

# Python 3

>>> print(type("Hello World!"))
<class 'str'>
# this is a Unicode string

>>> print(type(b"Hello World!"))
<class 'bytes'>
# this is a byte string

>>> ord('X')
88
>>> chr(88)
'X'

>>> S = 'XYZ'
>>> S.encode('ascii')               # Values 0..127 in 1 byte (7 bits) each
>>> S.encode('latin-1')             # Values 0..255 in 1 byte (8 bits) each
S.encode('utf-8')                   # Values 0..127 in 1 byte, 128..2047 in 2, others 3 or 4

>>> chr(0xc4)                       # 0xC4, 0xE8: characters outside ASCII's range
>>> S = '\xc4\xe8'                  # Single byte 8-bit hex escapes
>>> S = '\u00c4\u00e8'              # 16-bit Unicode escapes
>>> len(S)                          # 2 characters long (not number of bytes!)

>>> S = '\u00c4\u00e8'
>>> S.encode('ascii')
UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-1:
ordinal not in range(128)

>>> S.encode('latin-1')             # One byte per character
b'\xc4\xe8'

>>> S.encode('utf-8')               # Two bytes per character
b'\xc3\x84\xc3\xa8'

>>> len(S.encode('latin-1')))
2
>>> len(S.encode('utf-8'))
4

from math import pi

class Circle():
    def __init__(self,r):
        self.r = r

    @property
    def area(self):
        return pi*self.r**2

c = Circle(2)
print(c.area)

class Date(object):

    def __init__(self, day=0, month=0, year=0):
        self.day = day
        self.month = month
        self.year = year

    @classmethod
    def from_string(cls, date_as_string):
        day, month, year = map(int, date_as_string.split('-'))
        date1 = cls(day, month, year)
        return date1

    @staticmethod
    def is_date_valid(date_as_string):
        day, month, year = map(int, date_as_string.split('-'))
        return day <= 31 and month <= 12 and year <= 3999

date2 = Date.from_string('11-09-2012')
is_date = Date.is_date_valid('11-09-2012')

@classmethod
def from_string(cls, date_as_string):
    day, month, year = map(int, date_as_string.split('-'))
    date1 = cls(day, month, year)
    return date1

date2 = Date.from_string('11-09-2012')

class Attr(object):

    def __init__(self, name):
        self.name = name

    def __getattribute__(self, item):
        print("__getattribute__ " + item)
        return object.__getattribute__(self, item)

    def __getattr__(self, item):
        print("__getattr__ " + item)

    def __setattr__(self, key, value):
        print("__setattr__ key %s, value %s" % (key, value))
        object.__setattr__(self, key, value)


if __name__ == '__main__':
    attr = Attr('wendy')
    print("main " + attr.name)
    attr.name = 'nancy'

__setattr__ key name, value wendy
__getattribute__ name
main wendy
__setattr__ key name, value nancy

class PowTwo:
    """Class to implement an iterator
    of powers of two"""

    def __init__(self, max=0):
        self.max = max

    def __iter__(self):
        self.n = 0
        return self

    def __next__(self):
        if self.n <= self.max:
            result = 2 ** self.n
            self.n += 1
            return result
        else:
            raise StopIteration


p = PowTwo(5)
for i in p:
    print(i)

>>> mygenerator = (x*x for x in range(3))
>>> for i in mygenerator:
...    print(i)

>>> def createGenerator():
...    mylist = range(3)
...    for i in mylist:
...        yield i*i
...
>>> mygenerator = createGenerator() # create a generator
>>> print(mygenerator) # mygenerator is an object!
<generator object createGenerator at 0xb7555c34>
>>> for i in mygenerator:
...     print(i)
0
1
4

Python 3.6.1 (default, Apr 23 2017, 12:32:16)
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> print(sys.path)
['', '/home/einverne/.pyenv/versions/3.6.1/lib/python36.zip', '/home/einverne/.pyenv/versions/3.6.1/lib/python3.6', '/home/einverne/.pyenv/versions/3.6.1/lib/python3.6/lib-dynload', '/home/einverne/.pyenv/versions/3.6.1/lib/python3.6/site-packages']

export PYTHONPATH=$PYTHONPATH:~/pypath:~/py1

├── douban
│   ├── album.py
│   ├── celebrity.py
│   ├── __init__.py

import douban

import douban.album

from douban import celebrity

>>> name = "Eric"
>>> age = 74
>>> f"Hello, {name}. You are {age}."
'Hello, Eric. You are 74.'

>>> "Hello, %s. You are %s." % (name, age)
>>> "Hello, {}. You are {}.".format(name, age)

public void interrupt() // 无返回值
public boolean isInterrupted() // 有返回值
public static boolean interrupted() // 静态，有返回值

fdisk -l

fdisk /dev/sdb

CREATE TABLE test
(
    name VARCHAR(20),
    UNIQUE(name)
);

mysql>     INSERT INTO test VALUES('California');
Query OK, 1 row affected (0.00 sec)

mysql>     INSERT INTO test VALUES('california');
ERROR 1062 (23000): Duplicate entry 'california' for key 'name'

mysql>     INSERT INTO test VALUES('cAlifornia');
ERROR 1062 (23000): Duplicate entry 'cAlifornia' for key 'name'

mysql>     INSERT INTO test VALUES('cALifornia');
ERROR 1062 (23000): Duplicate entry 'cALifornia' for key 'name'

mysql> SELECT * FROM test;
+------------+
| name       |
+------------+
| California |
+------------+
1 row in set (0.00 sec)

mysql>     CREATE TABLE test
    ->     (
    ->         name varchar(20) BINARY,
    ->         UNIQUE(name)
    ->     );
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql>     INSERT INTO test VALUES('California');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql>     INSERT INTO test VALUES('california');
Query OK, 1 row affected (0.00 sec)

mysql>     INSERT INTO test VALUES('cAlifornia');
Query OK, 1 row affected (0.00 sec)

mysql>     INSERT INTO test VALUES('cALifornia');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql>     SELECT * FROM test;
+------------+
| name       |
+------------+
| California |
| cALifornia |
| cAlifornia |
| california |
+------------+
4 rows in set (0.00 sec)

select * from table where binary name='Abc'

/etc/mysql/my.cnf

lower_case_table_names = 1

echo $0

prompt:~$ echo $0
/bin/bash
prompt:~$ sh
sh-4.0$ echo $0
sh
sh-4.0$ exit
exit
prompt:~$ /bin/sh
sh-4.0$ echo $0
/bin/sh
sh-4.0$

{
  "ret": "101",
  "error": [
    {
      "errortype": "A0001",
      "errorstroke": {
        "0": "0.2",
        "1": "0.3"
      }
    },
    {
      "errortype": "A0021",
      "errorstroke": {
        "0": "0.2",
        "1": "0.3"
      }
    }
  ]
}

#include <iostream>
#include <vector>
#include <string>

#include "rapidjson/document.h"
#include "rapidjson/writer.h"
#include "rapidjson/stringbuffer.h"

using namespace rapidjson;
using namespace std;

int main() {

    string ret =
            "{\"ret\":\"101\",\"error\":[{\"errortype\":\"A0001\",\"errorstroke\":{\"0\":\"0.2\",\"1\":\"0.3\"}},{\"errortype\":\"A0021\",\"errorstroke\":{\"0\":\"0.2\",\"1\":\"0.3\"}}]}";
    rapidjson::Document doc;
    doc.Parse<kParseDefaultFlags>(ret.c_str());
    if (doc.HasMember("ret")) {
        string retjson = doc["ret"].GetString();
        for (unsigned i = 0; i < retjson.length(); ++i) {
            cout << retjson.at(i) << " ";
        }
    }
    cout << endl;
    if (doc.HasMember("error")) {
        const Value & errorjson = doc["error"];
        for (SizeType i = 0; i < errorjson.Size(); ++i) {
            // 或者这里可以换用一种遍历使用 Value::ConstValueIterator
            // http://rapidjson.org/md_doc_tutorial.html#QueryArray
            if (errorjson[i].HasMember("errortype")) {
                string errortype = errorjson[i]["errortype"].GetString();
                cout << "errortype: " << errortype << endl;
            }
            if (errorjson[i].HasMember("errorstroke")) {
                const Value & errorstroke = errorjson[i]["errorstroke"];
                cout << "errorstroke" << endl;
                for (Value::ConstMemberIterator iter = errorstroke.MemberBegin();iter != errorstroke.MemberEnd(); ++iter) {
                    cout << iter->name.GetString() << ": " << iter->value.GetString() << endl;
                }
            }
        }
    }

    return 0;
}

/*
 first config your project to include /usr/local/include
 second link lib /usr/local/lib
 */

#include <iostream>
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>
#include <boost/foreach.hpp>
#include <string>

using namespace boost::property_tree;

int main(int argc, const char * argv[]) {

    std::string str_json = "{\"ret\":\"101\",\"error\":[{\"errortype\":\"A0001\",\"errorstroke\":{\"0\":\"0.2\",\"1\":\"0.3\"}},{\"errortype\":\"A0021\",\"errorstroke\":{\"0\":\"0.2\",\"1\":\"0.3\"}}]}";

    ptree pt;                       //define property_tree object
    std::stringstream ss(str_json);
    try {
        read_json(ss, pt);          //parse json
    } catch (ptree_error & e) {
        return 1;
    }

    std::cout << pt.get<std::string>("ret") << std::endl;
    ptree errortype = pt.get_child("error");            // get_child to get errors

    // first way
    for (boost::property_tree::ptree::iterator it = errortype.begin(); it != errortype.end(); ++it) {
        std::cout << it->first;
        std::cout << it->second.get<std::string>("errortype") << std::endl;
        ptree errorstroke = it->second.get_child("errorstroke");
        for (ptree::iterator iter = errorstroke.begin(); iter != errorstroke.end(); ++iter) {
            std::string key = iter->first;
            std::cout << iter->first << std::endl;
            std::cout << iter->second.data() << std::endl;
        }
    }

    // second way: using boost foreach feature
//    BOOST_FOREACH(ptree::value_type &v, errortype){
//        ptree& childparse = v.second;
//        std::cout << childparse.get<std::string>("errortype") << std::endl;
//        ptree errorstroke = childparse.get_child("errorstroke");
//        BOOST_FOREACH(ptree::value_type& w, errorstroke){
//            std::cout << w.first << std::endl;
//            std::cout << w.second.data() << std::endl;
//        }
//    }

    /*
     101
     A0001
     0
     0.2
     1
     0.3
     A0021
     0
     0.2
     1
     0.3
     */

    return 0;
}