ipython中%load\u ext的工作方式

我安装软件包：

根据教程，我应该使用

$ ipython
In [1] : %load_ext ipydb

它看起来像是IPython的延伸

但是我感到困惑，这个软件包没有安装在我的“~/.ipython/extensions”下

所以，我想知道

• %load\u ext magic是如何工作的，或者键入“%load\u ext ipydb”时发生了什么

• 如果我只键入“ipython”，它将使用默认配置文件，但在我的“~/.ipython/profile_default/”下没有配置文件，那么ipython如何进行配置

以下是默认配置文件和一个用户定义的配置文件：

aaron@aarons-MacBook-Pro:~/Desktop/github/ipydb$ls ~/.ipython/profile_default/
db             history.sqlite log            nbconfig       pid            security       startup        static
aaron@aarons-MacBook-Pro:~/Desktop/github/ipydb$ipython profile create my_profile
[ProfileCreate] Generating default config file: u'/Users/aaron/.ipython/profile_my_profile/ipython_config.py'
[ProfileCreate] Generating default config file: u'/Users/aaron/.ipython/profile_my_profile/ipython_kernel_config.py'
[ProfileCreate] Generating default config file: u'/Users/aaron/.ipython/profile_my_profile/ipython_console_config.py'
[ProfileCreate] Generating default config file: u'/Users/aaron/.ipython/profile_my_profile/ipython_qtconsole_config.py'
[ProfileCreate] Generating default config file: u'/Users/aaron/.ipython/profile_my_profile/ipython_notebook_config.py'
[ProfileCreate] Generating default config file: u'/Users/aaron/.ipython/profile_my_profile/ipython_nbconvert_config.py'
aaron@aarons-MacBook-Pro:~/Desktop/github/ipydb$ls ~/.ipython/profile_my_profile/
ipython_config.py           ipython_nbconvert_config.py log                         startup
ipython_console_config.py   ipython_notebook_config.py  pid                         static
ipython_kernel_config.py    ipython_qtconsole_config.py security
aaron@aarons-MacBook-Pro:~/Desktop/github/ipydb$

---

谢谢，

好的，最后，我找到了在ipython中加载扩展的逻辑：

源代码位于：

核心逻辑是：

def load_extension(self, module_str):
        """Load an IPython extension by its module name.
        Returns the string "already loaded" if the extension is already loaded,
        "no load function" if the module doesn't have a load_ipython_extension
        function, or None if it succeeded.
        """
        if module_str in self.loaded:
            return "already loaded"

        from IPython.utils.syspathcontext import prepended_to_syspath

        with self.shell.builtin_trap:
            if module_str not in sys.modules:
                with prepended_to_syspath(self.ipython_extension_dir):
                    __import__(module_str)
            mod = sys.modules[module_str]
            if self._call_load_ipython_extension(mod):
                self.loaded.add(module_str)
            else:
                return "no load function"

这是有意义的现在，感谢IPython团队建立这样一个优秀的工具，我真的很喜欢它

def load_extension(self, module_str):
        """Load an IPython extension by its module name.
        Returns the string "already loaded" if the extension is already loaded,
        "no load function" if the module doesn't have a load_ipython_extension
        function, or None if it succeeded.
        """
        if module_str in self.loaded:
            return "already loaded"

        from IPython.utils.syspathcontext import prepended_to_syspath

        with self.shell.builtin_trap:
            if module_str not in sys.modules:
                with prepended_to_syspath(self.ipython_extension_dir):
                    __import__(module_str)
            mod = sys.modules[module_str]
            if self._call_load_ipython_extension(mod):
                self.loaded.add(module_str)
            else:
                return "no load function"