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Commit 61b87cb

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ch06
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‎README.md‎

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# 《Python 源码剖析》学习笔记
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> 我看的《Python 源码剖析》是 2008 年出版的,Python 版本是 2.5。
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> 《Python 源码剖析》
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> 作者:陈儒 Robert Chen
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> 出版年份:2008 年
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> Python 版本:2.5
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在阅读《Python 源码剖析》的过程中记录的一些笔记,不是特别详细,简单记录了一些关键的地方,方便以后查看。
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每个 chxx 分支对应书中相应的章节,基于 master 分支修改而来。
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## 其它资源
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- [作者在 CSDN 的博客](https://blog.csdn.net/balabalamerobert)(不再更新)。
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- [Extending and Embedding the Python Interpreter](https://docs.python.org/2.7/extending/index.html)
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扩展和嵌入 Python 解析器,介绍了如何用 C/C++ 编写 Python 的扩展模块,如何在其它语言中嵌入 Python 解释器。
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- [C API](https://docs.python.org/2.7/c-api/index.html)
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详细介绍了 Python 内部的 C API。
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- [Python Developer’s Guide](https://devguide.python.org/)
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Python 开发者指南。
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## 目录
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- [ch01 - Pyhton 对象初探](ch01.md)
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- [ch02 - Pyhton 中的整数对象](ch02.md)
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- [ch03 - Pyhton 中的字符串对象](ch03.md)
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- [ch04 - Python 中的 List 对象](ch04.md)
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- 第一部分
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- [ch01 - Pyhton 对象初探](ch01.md)
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- [ch02 - Pyhton 中的整数对象](ch02.md)
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- [ch03 - Pyhton 中的字符串对象](ch03.md)
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- [ch04 - Python 中的 List 对象](ch04.md)
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- [ch05 - Python 中的 Dict 对象](ch05.md)
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- [ch06 - 最简单的Python模拟——Small Python](ch06.md)
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- 第二部分
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- [ch07 - Python的编译结果——Code对象与pyc文件](ch07.md)
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‎assets/small_python/Makefile‎

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#####################################################
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#common settings
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#####################################################
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CC=g++
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LINK=g++
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INC_PREFIX=-I
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LIB_PREFIX=-L
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BUILD_PATH=./build
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CFLAGS=-c
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TARGET=small_python
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TEST_TARGET=test_$(TARGET)
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CUNIT_PATH=/home/robert/CUnit
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#####################################################
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#settings for normal compile
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#####################################################
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SRC_PATH=./src
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SRCS=$(wildcard $(SRC_PATH)/*.cpp)
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OBJS=$(patsubst $(SRC_PATH)/%.cpp,$(BUILD_PATH)/%.o,$(SRCS))
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INC_DIR=./include $(CUNIT_PATH)/include/CUnit
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INCS=$(addprefix $(INC_PREFIX),$(INC_DIR))
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#####################################################
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#settings for compiling test cases
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#####################################################
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TEST_PATH=./test
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TEST_SRCS=$(wildcard $(TEST_PATH)/*.cpp)
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TEST_OBJS=$(patsubst $(TEST_PATH)/%.cpp,$(BUILD_PATH)/%.o,$(TEST_SRCS))
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TEST_INC_DIR=$(INC_DIR) $(TEST_PATH) $(CUNIT_PATH)/include/CUnit
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TEST_LIB_DIR=$(CUNIT_PATH)/lib
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TEST_INCS=$(addprefix $(INC_PREFIX),$(TEST_INC_DIR))
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TEST_LIB_PATHS=$(addprefix $(LIB_PREFIX),$(TEST_LIB_DIR))
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TEST_LIBS=-lcunit
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#####################################################
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# set path or make
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#####################################################
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vpath %.cpp $(SRC_PATH)
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vpath %.o $(BUILD_PATH)
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vpath %.cpp $(TEST_PATH)
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#####################################################
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# normal compile
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#####################################################
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all : init $(TARGET)
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$(TARGET) : $(OBJS)
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@echo "generate excutable file : $@"
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$(LINK) -o $@ $(OBJS)
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$(OBJS) : $(BUILD_PATH)/%.o : $(SRC_PATH)/%.cpp
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$(CC) $(CFLAGS) $(INCS) -o $@ $<
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init:
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@echo "create $(BUILD_PATH) dir"
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mkdir $(BUILD_PATH)
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#####################################################
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# compile for test
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#####################################################
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test: clean init compile_test run_test
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compile_test: $(OBJS) $(TEST_OBJS)
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@echo "generate excutable file for testing : $(TEST_TARGET)"
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$(LINK) $(TEST_LIBS) $(TEST_LIB_PATHS) -o $(TEST_TARGET) $(TEST_OBJS) $(filter-out %main.o,$(OBJS))
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$(TEST_OBJS) : $(BUILD_PATH)/%.o : $(TEST_PATH)/%.cpp
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$(CC) $(CFLAGS) $(TEST_INCS) -o $@ $<
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run_test:
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./test_main
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#####################################################
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# clean
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#####################################################
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clean:
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rm -rf $(BUILD_PATH)
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rm -f $(TEST_TARGET)
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rm -f $(TARGET)
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#####################################################
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# robert's test
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#####################################################
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show:
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@echo "TEST_SRCS : $(TEST_SRCS)"
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@echo "TEST_INCS : $(TEST_INCS)"
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@echo "TEST_LIBS : $(TEST_LIBS)"
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@echo "TEST_OBJS : $(TEST_OBJS)"
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@echo "TEST_TARGET : $(TEST_TARGET)"

‎assets/small_python/include/engine.h‎

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#ifndef __PYTHONREADING_ENGINE_H_
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#define __PYTHONREADING_ENGINE_H_
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#include "object.h"
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#include "intObject.h"
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#include "strObject.h"
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#include <iostream>
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#include <string>
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#include <map>
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char* info = "********** Python Research **********\nInput 'exit' to exit\n";
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char* prompt = ">>> ";
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class ExcuteEngine
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{
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public:
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void Excute()
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{
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cout << info;
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cout << prompt;
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while(getline(cin, m_Command))
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{
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if(m_Command.size() == 0)
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{
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cout << prompt;
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continue;
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}
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else if(m_Command == "exit")
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{
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return;
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}
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else
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{
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ExcuteCommand(m_Command);
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}
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cout << prompt;
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}
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}
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private:
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void ExcuteCommand(string& command)
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{
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string::size_type pos = 0;
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if((pos = command.find("print ")) != string::npos)
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{
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ExcutePrint(command.substr(6));
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}
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else if((pos = command.find(" = ")) != string::npos)
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{
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string target = command.substr(0, pos);
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string source = command.substr(pos+3);
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ExcuteAdd(target, source);
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}
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else {
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cout << "[Error] : Can not recognize : " << command << endl;
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}
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}
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void ExcutePrint(string symbol)
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{
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PyObject* object = GetObjectFromSymbol(symbol);
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if(object != NULL)
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{
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PyTypeObject* type = object->type;
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type->print(object);
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}
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}
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void ExcuteAdd(string& target, string& source)
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{
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string::size_type pos;
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if(IsSourceAllDigit(source))
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{
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PyObject* intObject = CreatePyIntObject(atoi(source.c_str()));
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if(m_Symbol2Object.find(target) == m_Symbol2Object.end()) {
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m_Symbol2Object.insert(map<string, PyObject*>::value_type(target, intObject));
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}
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else {
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m_Symbol2Object[target] = intObject;
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}
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}
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else if(source.find("\"") != string::npos || source.find("'") != string::npos)
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{
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PyObject* strObject = CreatePyStrObject(source.substr(1, source.size()-2).c_str());
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if(m_Symbol2Object.find(target) == m_Symbol2Object.end()) {
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m_Symbol2Object.insert(map<string, PyObject*>::value_type(target, strObject));
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}
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else {
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m_Symbol2Object[target] = strObject;
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}
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}
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else if((pos = source.find("+")) != string::npos)
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{
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PyObject* leftObject = GetObjectFromSymbol(Trim(source.substr(0, pos)));
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PyObject* rightObject = GetObjectFromSymbol(Trim(source.substr(pos+1)));
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if(leftObject != NULL && right != NULL && leftObject->type == rightObject->type)
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{
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PyObject* result = (leftObject->type)->add(leftObject, rightObject);
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m_Symbol2Object.insert(map<string, PyObject*>::value_type(target, result));
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}
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}
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}
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bool IsSourceAllDigit(string& source)
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{
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string::size_type len = source.size();
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for(string::size_type i = 0; i < len; ++i)
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{
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if(!isdigit(source[i]))
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{
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return false;
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}
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}
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return true;
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}
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PyObject* GetObjectFromSymbol(string symbol)
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{
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map<string, PyObject*>::iterator it = m_Symbol2Object.find(symbol);
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if(it == m_Symbol2Object.end())
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{
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cout << "[Error] : " << symbol << " is not defined!!" << endl;
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return NULL;
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}
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return it->second;
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}
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string Trim(string symbol) {
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int length = symbol.length();
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int start = 0;
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while(symbol[start] == ' ') {
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++start;
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}
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int end = length-1;
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while(symbol[end] == ' ') {
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--end;
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}
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return symbol.substr(start, end+1);
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}
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private:
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string m_Command;
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map<string, PyObject*> m_Symbol2Object;
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};
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#endif
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#ifndef __PYTHONREADING_INTOBJECT_H_
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#define __PYTHONREADING_INTOBJECT_H_
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#include "object.h"
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typedef struct tagPyIntObject
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{
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PyObject_HEAD;
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int value;
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}PyIntObject;
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extern PyTypeObject PyInt_Type;
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PyObject* CreatePyIntObject(int value);
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#endif

‎assets/small_python/include/object.h‎

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#ifndef __PYTHONREADING_OBJECT_H_
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#define __PYTHONREADING_OBJECT_H_
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//definition of PyObject
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#define PyObject_HEAD \
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int refCount;\
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struct tagPyTypeObject *type
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#define PyObject_HEAD_INIT(typePtr)\
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0, typePtr
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typedef struct tagPyObject
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{
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PyObject_HEAD;
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}PyObject;
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//definition of PyTypeObject
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typedef void (*PrintFun)(PyObject* object);
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typedef PyObject* (*AddFun)(PyObject* left, PyObject* right);
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typedef struct tagPyTypeObject
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{
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PyObject_HEAD;
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char* name;
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PrintFun print;
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AddFun add;
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}PyTypeObject;
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extern PyTypeObject PyType_Type;
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#endif
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#ifndef __PYTHONREADING_STROBJECT_H_
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#define __PYTHONREADING_STROBJECT_H_
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#include "object.h"
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typedef struct tagPyStrObject
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{
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PyObject_HEAD;
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char value[50];
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}PyStrObject;
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extern PyTypeObject PyStr_Type;
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PyObject* CreatePyStrObject(const char* value);
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#endif

‎assets/small_python/samll_python.ncb‎

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‎assets/small_python/samll_python.sln‎

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Microsoft Visual Studio Solution File, Format Version 8.00
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Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "samll_python", "samll_python.vcproj", "{CE93E66B-1A83-4AEB-850A-7E07AF661E62}"
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ProjectSection(ProjectDependencies) = postProject
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EndProjectSection
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EndProject
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Global
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GlobalSection(SolutionConfiguration) = preSolution
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Debug = Debug
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Release = Release
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EndGlobalSection
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GlobalSection(ProjectConfiguration) = postSolution
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{CE93E66B-1A83-4AEB-850A-7E07AF661E62}.Debug.ActiveCfg = Debug|Win32
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{CE93E66B-1A83-4AEB-850A-7E07AF661E62}.Debug.Build.0 = Debug|Win32
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{CE93E66B-1A83-4AEB-850A-7E07AF661E62}.Release.ActiveCfg = Release|Win32
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{CE93E66B-1A83-4AEB-850A-7E07AF661E62}.Release.Build.0 = Release|Win32
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EndGlobalSection
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GlobalSection(ExtensibilityGlobals) = postSolution
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EndGlobalSection
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GlobalSection(ExtensibilityAddIns) = postSolution
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EndGlobalSection
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EndGlobal

‎assets/small_python/samll_python.suo‎

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