The pandas in Python

1. The most important thing in the pandas library is the variable-length dictionary (series) and the most important function of the series is alignment; that is, an index, a value in the form, as follows:

The series uses PD, which automatically adds an index to each value in the list, or you can specify the index yourself as follows:

I generated the dictionary in the form of a list, as follows:

You can change the format of Dictionary D with series as follows:

In addition, the series can also be added in the following manner as follows:

Index numbers are added together, different return Nan, and automatically align different index numbers

2, the name attribute in the series is also very important

' Order ' is a man-made name, student is the name of the whole M1, so it's efficient to deal with the problem!

3, Dataframe more powerful than series, series can only handle one-to-one, for a pair of more can not deal with, what meaning? As shown in the following:

As shown, for a one-to-many case series will be an error, but the use of dataframe will be handled particularly well!

Next, let's look at some of the basic operations of Dataframe:

The corresponding mapping is output by index. IX, and the elements can be changed;

To delete an operation

Like series, Dataframe can also add the name attribute to the index:

Add x, Y, z through columns

The pandas in Python