Type Casting

(under construction (last change 17.05.2015))

R to Python (pySet)

R	length (n)	Python
NULL		None
any type	0	None
logical	1	boolean
integer	1	integer
numeric	1	double
character	1	unicode
logical	n > 1	list
integer	n > 1	list
numeric	n > 1	list
character	n > 1	list
list without names	n > 0	list
list with names	n > 0	dict
matrix	n > 0	dict
data.frame	n > 0	dict

NOTE (named lists):

When executing pySet("x", list(b=3, a=2)) and pyGet("x") the

order of the elements in x will change. This is not a special behavior of PythonInR but the default behavior of Python.

NOTE (matrix):

Matrices are either transformed to an dictionary with the keys

- matrix the matrix stored as list of lists

- rownames the row names of the matrix

- colnames the column names of the matrix

- dim the dimension of the matrix

or to an numpy array (if the option useNumpy is set to TRUE).

NOTE (data.frame):

Data frames are either transformed to an dictionary with the keys

- data.frame the data.frame stored as a dictionary

- rownames the rownames of the data.frame

- dim the dimension of the data.frame

of to an pandas data.frame (if the option usePandas is set to TRUE).

R to Python (pyGet)

Python	R	simplify
None	NULL	TRUE / FALSE
boolean	logical	TRUE / FALSE
integer	integer	TRUE / FALSE
double	numeric	TRUE / FALSE
string	character	TRUE / FALSE
unicode	character	TRUE / FALSE
bytes	character	TRUE / FALSE
list	list	FALSE
list	list or vector	TRUE
dict	named list	FALSE
dict	named list or vector	TRUE

NOTE (bytes):

In short, in Python 3 the data type string was replaced by the data

type bytes. More information can be found here.