[PYTHON] To output a value even in the middle of a cell with Jupyter Notebook

First from the basic operation

Needless to say, the last value of the cell is automatically output. Depending on the value, it can be output in a form that is easier to see than a character string. A typical one is pandas DataFrame.

Notebook

from bokeh.sampledata import iris   #Sample data included in Bokeh
df = iris.flowers

df.head()

Two or more values can be output by making them tuples, but the output will be a character string.

Notebook

df.head(), df.tail()

(   sepal_length  sepal_width  petal_length  petal_width species
 0           5.1          3.5           1.4          0.2  setosa
 1           4.9          3.0           1.4          0.2  setosa
 2           4.7          3.2           1.3          0.2  setosa
 3           4.6          3.1           1.5          0.2  setosa
 4           5.0          3.6           1.4          0.2  setosa,
      sepal_length  sepal_width  petal_length  petal_width    species
 145           6.7          3.0           5.2          2.3  virginica
 146           6.3          2.5           5.0          1.9  virginica
 147           6.5          3.0           5.2          2.0  virginica
 148           6.2          3.4           5.4          2.3  virginica
 149           5.9          3.0           5.1          1.8  virginica)

print function

Needless to say, the print function. If you use this, you can output the value even in the middle of the cell. However, it is a pity that only character strings can be output.

Notebook

from bokeh.sampledata import iris
df = iris.flowers

print(df.head())
print(df.tail())

   sepal_length  sepal_width  petal_length  petal_width species
0           5.1          3.5           1.4          0.2  setosa
1           4.9          3.0           1.4          0.2  setosa
2           4.7          3.2           1.3          0.2  setosa
3           4.6          3.1           1.5          0.2  setosa
4           5.0          3.6           1.4          0.2  setosa
     sepal_length  sepal_width  petal_length  petal_width    species
145           6.7          3.0           5.2          2.3  virginica
146           6.3          2.5           5.0          1.9  virginica
147           6.5          3.0           5.2          2.0  virginica
148           6.2          3.4           5.4          2.3  virginica
149           5.9          3.0           5.1          1.8  virginica

Display function in the IPython.display module

If you use the display function instead of the print function, you can print in the middle of the cell in the same easy-to-read format as the last value in the cell.

Notebook

from IPython.display import display
from bokeh.sampledata import iris
df = iris.flowers

display(df.head(), df.tail())

Setting to output all values

If you don't want to use the display function, you can set it to output all values. However, note that it is necessary to set in advance in a cell different from the cell where you want to output.

Notebook

from IPython.core.interactiveshell import InteractiveShell
InteractiveShell.ast_node_interactivity = "all"

Notebook

from bokeh.sampledata import iris
df = iris.flowers

df.head()
df.tail()

To return to the original state, substitute the default value 'last_expr' for ʻast_node_interactivity`.

Notebook

InteractiveShell.ast_node_interactivity = 'last_expr'