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Data types and data conversion

As you may notice, when we print out a Series object, its data type will be declared in the last line. An alternative way is to call dtype for each Series, or .dtypes for the entire dataframe (it will return a Series object). Those data types are defined in C, and not Python. The majority of them largely match Python ones; for example, integers, floats, and Booleans. There are, however, a few caveats to be aware of regarding the data types:

• First, there is no existing data type for strings. As you may notice in the last code block, all strings are defined as objects, that is, an arbitrary Python object. This type is the last resort, the type that suits any Python value but does not give any computation benefits.  ...