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Title:
Series.str.zfill() behaves differently than str.zfill() from standard library Β· Issue #20868 Β· pandas-dev/pandas
Description:
Code Sample, a copy-pastable example if possible # Pandas >>> s = pd.Series(['-2', '+5']) >>> s.str.zfill(5) 0 000-2 1 000+5 dtype: object # Python 3.6 >>>...
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Topics {βοΈ}
string data type activity alkamid changed 9d1a0d5 atulagrwl mentioned comment metadata assignees type projects projects milestone personal information series resulting strings standard library' 1fc6467 jreback modified milestone relationships object output problem area expect series fixing series align series behaves differently copy-pastable special characters issue result = str_pad side='left' github behave differently bug str methods series left methods result behave str skip jump sign zfill = pd treat '+' move feature find rationale behaviour affects pad rjust center pd show_versions watch
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DiscussionForumPosting:
context:https://schema.org
headline:Series.str.zfill() behaves differently than str.zfill() from standard library
articleBody:#### Code Sample, a copy-pastable example if possible
```python
# Pandas
>>> s = pd.Series(['-2', '+5'])
>>> s.str.zfill(5)
0 000-2
1 000+5
dtype: object
# Python 3.6
>>> '-2'.zfill(5)
'-0002'
>>> '+5'.zfill(5)
'+0005'
```
#### Problem description
People used to the standard library's `str` methods may expect `Series.str.zfill()` to behave differently, i.e. to treat '+' and '-' as special characters and move them to the left of the resulting strings if necessary. This could be a feature, not a bug, but I couldn't find any rationale behind this behaviour. This issue also affects the following methods from `Series.str`: `pad`, `rjust`, `center`.
#### Expected Output
```python
# Pandas
>>> s = pd.Series(['-2', '+5'])
>>> s.str.zfill(5)
0 -0002
1 +0005
dtype: object
```
#### Output of ``pd.show_versions()``
<details>
INSTALLED VERSIONS
------------------
commit: 563a6ad108a79b0192a25d51d743812a18e21b15
python: 3.6.5.final.0
python-bits: 64
OS: Linux
OS-release: 3.13.0-39-generic
machine: x86_64
processor: x86_64
byteorder: little
LC_ALL: None
LANG: en_GB.UTF-8
LOCALE: en_GB.UTF-8
pandas: 0.23.0.dev0+807.g563a6ad
pytest: 3.5.0
pip: 9.0.3
setuptools: 39.0.1
Cython: 0.28.2
numpy: 1.14.2
scipy: 1.0.1
pyarrow: 0.9.0
xarray: 0.10.3
IPython: 6.3.1
sphinx: 1.7.3
patsy: 0.5.0
dateutil: 2.7.2
pytz: 2018.4
blosc: None
bottleneck: 1.2.1
tables: 3.4.3
numexpr: 2.6.4
feather: 0.4.0
matplotlib: 2.2.2
openpyxl: 2.5.3
xlrd: 1.1.0
xlwt: 1.3.0
xlsxwriter: 1.0.4
lxml: 4.2.1
bs4: 4.6.0
html5lib: 1.0.1
sqlalchemy: 1.2.7
pymysql: 0.8.0
psycopg2: None
jinja2: 2.10
s3fs: 0.1.4
fastparquet: 0.1.5
pandas_gbq: None
pandas_datareader: None
</details>
author:
url:https://github.com/alkamid
type:Person
name:alkamid
datePublished:2018-04-29T16:35:59.000Z
interactionStatistic:
type:InteractionCounter
interactionType:https://schema.org/CommentAction
userInteractionCount:4
url:https://github.com/20868/pandas/issues/20868
context:https://schema.org
headline:Series.str.zfill() behaves differently than str.zfill() from standard library
articleBody:#### Code Sample, a copy-pastable example if possible
```python
# Pandas
>>> s = pd.Series(['-2', '+5'])
>>> s.str.zfill(5)
0 000-2
1 000+5
dtype: object
# Python 3.6
>>> '-2'.zfill(5)
'-0002'
>>> '+5'.zfill(5)
'+0005'
```
#### Problem description
People used to the standard library's `str` methods may expect `Series.str.zfill()` to behave differently, i.e. to treat '+' and '-' as special characters and move them to the left of the resulting strings if necessary. This could be a feature, not a bug, but I couldn't find any rationale behind this behaviour. This issue also affects the following methods from `Series.str`: `pad`, `rjust`, `center`.
#### Expected Output
```python
# Pandas
>>> s = pd.Series(['-2', '+5'])
>>> s.str.zfill(5)
0 -0002
1 +0005
dtype: object
```
#### Output of ``pd.show_versions()``
<details>
INSTALLED VERSIONS
------------------
commit: 563a6ad108a79b0192a25d51d743812a18e21b15
python: 3.6.5.final.0
python-bits: 64
OS: Linux
OS-release: 3.13.0-39-generic
machine: x86_64
processor: x86_64
byteorder: little
LC_ALL: None
LANG: en_GB.UTF-8
LOCALE: en_GB.UTF-8
pandas: 0.23.0.dev0+807.g563a6ad
pytest: 3.5.0
pip: 9.0.3
setuptools: 39.0.1
Cython: 0.28.2
numpy: 1.14.2
scipy: 1.0.1
pyarrow: 0.9.0
xarray: 0.10.3
IPython: 6.3.1
sphinx: 1.7.3
patsy: 0.5.0
dateutil: 2.7.2
pytz: 2018.4
blosc: None
bottleneck: 1.2.1
tables: 3.4.3
numexpr: 2.6.4
feather: 0.4.0
matplotlib: 2.2.2
openpyxl: 2.5.3
xlrd: 1.1.0
xlwt: 1.3.0
xlsxwriter: 1.0.4
lxml: 4.2.1
bs4: 4.6.0
html5lib: 1.0.1
sqlalchemy: 1.2.7
pymysql: 0.8.0
psycopg2: None
jinja2: 2.10
s3fs: 0.1.4
fastparquet: 0.1.5
pandas_gbq: None
pandas_datareader: None
</details>
author:
url:https://github.com/alkamid
type:Person
name:alkamid
datePublished:2018-04-29T16:35:59.000Z
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url:https://github.com/20868/pandas/issues/20868
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name:alkamid
url:https://github.com/alkamid
name:alkamid
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