October 2017
Intermediate to advanced
532 pages
16h 10m
English
Content preview from Pandas Cookbook
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How it works...
Pandas defaults integer and float data types to 64 bits regardless of the maximum necessary size for the particular DataFrame. Integers, floats, and even booleans may be coerced to a different data type with the astype method and passing it the exact type, either as a string or specific object, as done in step 4.
The RELAFFIL column is a good choice to cast to a smaller integer type as the data dictionary explains that its values must be 0/1. The memory for RELAFFIL is now an eighth of CURROPER, which remains as its former type.
The memory units displayed are in bytes and not bits. One byte is equivalent to 8 bits, so when RELAFFIL was changed to an 8-bit integer, it uses one 1 byte of memory and as there are 7,535 rows, its ...
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