_makep(array, descr_output, format, nrows=None)
The descriptor location will have a zero offset for all columns after this call. The final offset will be calculated when the file is written.
input object array
output "descriptor" array of data type int32 (for P format arrays) or int64 (for Q format arrays)--must be nrows long in its first dimension
the _FormatP object representing the format of the variable array
number of rows to create in the column; defaults to the number of rows in the input array
Construct the P (or Q) format column array, both the data descriptors and the data. It returns the output "data" array of data type :None:None:`dtype`.
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