(continued from previous pagem column[ [ column[ [ column[ [ del column[ column[ [ column[ traceback (most recent call last)indexerror __init__(matrixinitialize self see help(type(self)for accurate signature methods __init__(matrixformat([column_indexformatterformat_specs]get_converter(theformatterselect(indicesinitialize self format column return the actual converter or built-in converter examples developer' guide developer' guide development steps for code changes git clone cd pyexcel upgrade your setup tools and pip they are needed for development and testing only pip install -upgrade setuptools pip then install relevant development requirements pip install - rnd_requirements txt if such file exists pip install - requirements txt pip install - tests/requirements txt once you have finished your changesplease provide test case( )relevant documentation and update changelog yml noteas to rnd_requirements txtusuallyit is created when dependent library is not released once the dependecy is installed (will be released)the future version of the dependency in the requirements txt will be valid support the project