IPython Notebook不在数据框中打印type（）

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:

Answer 1

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 <type ...> in this answer, the same thing would have happened to my answer.

Answer 2

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.