Skip to content

DOC: astype now takes dict mapping col names to datatypes (#14761) #14837

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 9 commits into from
Dec 22, 2016
Merged

DOC: astype now takes dict mapping col names to datatypes (#14761) #14837

Changes from all commits
Commits
Show all changes
9 commits
Select commit Hold shift + click to select a range
3f5d728
astype method now takes dict mapping col names to datatypes #14761
m-charlton Dec 9, 2016
fddbb2e
Updates after review
m-charlton Dec 15, 2016
a61ec51
Corrections to docs after review feedback
m-charlton Dec 15, 2016
e714d8c
Merge branch 'update_docs_astype_with_dict_#14761' of https://github.…
m-charlton Dec 15, 2016
136175c
Merge branch 'update_docs_astype_with_dict_#14761'
m-charlton Dec 15, 2016
6282de6
Merge remote-tracking branch 'upstream/master'
m-charlton Dec 16, 2016
0c90785
Removing uneeded changes
m-charlton Dec 15, 2016
bc65ff4
Merge remote-tracking branch 'upstream/master'
m-charlton Dec 19, 2016
b9414a9
Correcting after review
m-charlton Dec 19, 2016
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
12 changes: 12 additions & 0 deletions doc/source/basics.rst
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1757,6 +1757,7 @@ then the more *general* one will be used as the result of the operation.
# conversion of dtypes
df3.astype('float32').dtypes


Convert a subset of columns to a specified type using :meth:`~DataFrame.astype`

.. ipython:: python
Expand All @@ -1766,6 +1767,17 @@ Convert a subset of columns to a specified type using :meth:`~DataFrame.astype`
dft
dft.dtypes

.. versionadded:: 0.19.0

Convert certain columns to a specific dtype by passing a dict to :meth:`~DataFrame.astype`

.. ipython:: python

dft1 = pd.DataFrame({'a': [1,0,1], 'b': [4,5,6], 'c': [7, 8, 9]})
dft1 = dft1.astype({'a': np.bool, 'c': np.float64})
dft1
dft1.dtypes

.. note::

When trying to convert a subset of columns to a specified type using :meth:`~DataFrame.astype` and :meth:`~DataFrame.loc`, upcasting occurs.
Expand Down