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Learning pandas - Second Edition by Michael Heydt

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Explicit lookup by labels with .loc[]

Lookup by label can also be achieved by using the .loc[] property:

There are no problems using integer labels:

Note that .loc[] has a different behavior than .iloc[] when passing an index label that is not in the index. In that case, pandas will return a NaN value instead of throwing an exception:

What is NaN? We will see this in more detail later in the chapter, but pandas uses it for the representation ...

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