Python pandas dataframe crosstab tutorial 18

### tutorial: python pandas dataframe crosstab tutorial

1. **import pandas library**: first, you need to import the pandas library to work with data frames and cross-tabulations.

4. **understanding the output**: the output will show the frequency distribution of the combinations of values in columns a and b.

### code example:

### output:

...

#18' python florida
#python 18
#python 1842
#python 18n
#18ft python eats alligator

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