Ipython Notebook not printing type() in dataframe

Question

This is a pretty bizarre bug:

The following code:

a = 'string1'
b = 'string2'

test_dict = {'col1':{a:type(a), b:type(b)},'col2':{a:type(a), b:type(b)}}
pd.DataFrame(test_dict)

In a normal ipython console yields the following as expected:

                col1          col2
string1  <type 'str'>  <type 'str'>
string2  <type 'str'>  <type 'str'>

However in the ipython notebook, the cells where the type should be displayed is empty:

enter image description here

Peter Rowell · Accepted Answer · 2012-12-30 17:25:44Z

4

I suspect that if you do a View->Source in your browser you will see the expected <type ...>. What's happening is that the browser thought this was an HTML tag, didn't recognize it, and simply threw it out.

Note: if I had not typed &lt;type ...> in this answer, the same thing would have happened to my answer.

answered Dec 30, 2012 at 17:25

Peter Rowell

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2 Comments

ChrisArmstrong Over a year ago

I was able to solve by converting to a string and reg ex'ing everything but the actual data type out...not pretty but it works and it's more compact then printing the whole <type 'str'> nonsense

minrk Over a year ago

This is not a bug in IPython, it is a bug in pandas - pandas is telling IPython that it already has an HTML repr, which IPython trusts is properly escaped, but it is not. Opened as pandas Issue 2617.

Abraham D Flaxman · Accepted Answer · 2012-12-31 06:09:54Z

3

A workaround is to print the dataframe, which makes it play better with the ipython notebook:

In [144]: print pd.DataFrame(test_dict)

                 col1          col2
string1  <type 'str'>  <type 'str'>
string2  <type 'str'>  <type 'str'>

I find the lines in the HTML tables distracting, so this workaround is my default.

answered Dec 31, 2012 at 6:09

Abraham D Flaxman

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