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# New configuration system

IPython has a configuration system. When running IPython for the first time, reasonable defaults are used for the configuration. The configuration of IPython can be changed in two ways:

> - Configuration files
> - Commands line options (which override the configuration files)

IPython has a separate configuration file for each subpackage. Thus, the main configuration files are (in your `~/.ipython` directory):

> - `ipython1.core.ini`
> - `ipython1.kernel.ini`
> - `ipython1.notebook.ini`

To create these files for the first time, do the following:

    from IPython.kernel.config import config_manager as kernel_config
    kernel_config.write_default_config_file()

But, you should only need to do this if you need to modify the defaults. If needed repeat this process with the `notebook` and `core` configuration as well. If you are running into problems with IPython, you might try deleting these configuration files.

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