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Pytables Atom

Another atom must be specified as the base argument in order to determine the base type used for storing the values of enumerated values in memory and disk.

This *storage atom * is kept in the base attribute of the created atom.

As a shorthand, you may specify a PyTables type instead of the storage atom , implying that this has a scalar shape.

, Another atom must be specified as the base argument in order to determine the base type used for storing the values of enumerated values in memory and disk.

This storage atom is kept in the base attribute of the created atom.

As a shorthand, you may specify a PyTables type instead of the storage atom , implying that this has a scalar shape.

, How to define atom for Pytables EArray creation.

Ask Question Asked 7 years, 3 months ago.

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Trying to create a Pytables EArray on the run based on one column from a numpy recarray.

This seems to work if I am using createArray as I can simply pass it the numpy array extracted from the recarray.

, PyTables & py2exe Howto (by Tommy Edvardsen) How to install PyTables when you’re not root (by Koen van de Sande) Tailoring atexit hooks; Using your own custom data types; SimpleTable: simple wrapper around the Table object; In-memory HDF5 files; Threading, This chapter consists of a series of simple yet comprehensive tutorials that will enable you to understand PyTables # main features.

If you would like more information about some particular instance variable, global function, or method, look at the doc strings or go to the library reference in Library Reference.

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, class Col ( atom.

Atom , metaclass = type): “””Defines a non-nested column.

Col instances are used as a means to declare the different properties of a non-nested column in a table or nested column.

Col classes are descendants of their equivalent Atom classes (see :ref:`AtomClassDescr`), but their instances have an additional _v_pos attribute that is used to decide the position of the column.

, Important changes in Atom specification.

The dtype argument of EnumAtom and EnumCol constructors has been replaced by the base argument, which can take a full-blown atom , although it accepts bare PyTables types as well.

This is a mandatory argument now.

vlstring pseudo-atoms used in VLArray nodes do no longer imply UTF-8 (nor any other) encoding, they only store and load raw strings of bytes.

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(fid.

root.

table, ‘ flow_y ‘,array_ atom ,array_shape) for m in range (n_frames): fid.

root.

table.

flow_x.

, 28/02/2015 If you pass the atom to the array.

Array constructor, self.

atom will still end up being None when it’s time to call hdf5extension.

Array.

_create_array.

Being Italian I love spaghetti but this is not my kind 🙂 @ PyTables /maintainers help, Supported data types in PyTables.

All PyTables datasets can handle the complete set of data types supported by the NumPy (see [NUMPY]) package in Python.

The data types for table fields can be set via instances of the Col class and its descendants (see The Col class and its descendants), while the data type of array elements can be set through the use of the Atom class and its descendants.

pytables atom