IPython Notebook cell multiple outputs

Question

I am running this cell in IPython Notebook:

# salaries and teams are Pandas dataframe
salaries.head()
teams.head()

The result is that I am

Answer 1

Provide,

print salaries.head()
teams.head()

Answer 2

IPython Notebook shows only the last return value in a cell. The easiest solution for your case is to use two cells.

If you really need only one cell you could do a hack like this:

class A:
    def _repr_html_(self):
        return salaries.head()._repr_html_() + '</br>' + teams.head()._repr_html_()

A()

If you need this often, make it a function:

def show_two_heads(df1, df2, n=5):
    class A:
        def _repr_html_(self):
            return df1.head(n)._repr_html_() + '</br>' + df2.head(n)._repr_html_()
    return A()

Usage:

show_two_heads(salaries, teams)

A version for more than two heads:

def show_many_heads(*dfs, n=5):
    class A:
        def _repr_html_(self):
            return  '</br>'.join(df.head(n)._repr_html_() for df in dfs) 
    return A()

Usage:

show_many_heads(salaries, teams, df1, df2)

Answer 3

Enumerating all the solutions:

• sys.displayhook(value), which IPython/jupyter hooks into. Note this behaves slightly differently from calling display, as it includes the Out[n] text. This works fine in regular python too!

• display(value), as in this answer

• get_ipython().ast_node_interactivity = 'all'. This is similar to but better than the approach taken by this answer.

Comparing these in an interactive session:

In [1]: import sys

In [2]: display(1)          # appears without Out
   ...: sys.displayhook(2)  # appears with Out
   ...: 3                   # missing
   ...: 4                   # appears with Out
1
Out[2]: 2
Out[2]: 4

In [3]: get_ipython().ast_node_interactivity = 'all'

In [2]: display(1)          # appears without Out
   ...: sys.displayhook(2)  # appears with Out
   ...: 3                   # appears with Out (different to above)
   ...: 4                   # appears with Out
1
Out[4]: 2
Out[4]: 3
Out[4]: 4

Note that the behavior in Jupyter is exactly the same as it is in ipython.

Answer 4

have you tried the display command?

from IPython.display import display
display(salaries.head())
display(teams.head())

Answer 5

An easier way:

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

It saves you having to repeatedly type "Display"

Say the cell contains this:

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

a = 1
b = 2

a
b

Then the output will be:

Out[1]: 1
Out[1]: 2

If we use IPython.display.display:

from IPython.display import display

a = 1
b = 2

display(a)
display(b)

The output is:

1
2

So the same thing, but without the Out[n] part.