date_range fails when I try to generate ones with 1 periods and freq equal WOM-1MON #20517
Description
Code Sample
import pandas as pd pd.date_range('20100104', periods=2, freq='WOM-1MON') # works pd.date_range('20100104', periods=1, freq='WOM-1MON') # failsTraceback (most recent call last): File "/Users/mmngreco/miniconda3/envs/pandas-dev/lib/python3.6/site-packages/IPython/core/interactiveshell.py", line 2910, in run_code exec(code_obj, self.user_global_ns, self.user_ns) File "<ipython-input-31-ec0b4bad59c9>", line 1, in <module> pd.date_range('20100104', periods=1, freq='WOM-1MON') File "/Users/mmngreco/miniconda3/envs/pandas-dev/lib/python3.6/site-packages/pandas/core/indexes/datetimes.py", line 2057, in date_range closed=closed, **kwargs) File "/Users/mmngreco/miniconda3/envs/pandas-dev/lib/python3.6/site-packages/pandas/util/_decorators.py", line 118, in wrapper return func(*args, **kwargs) File "/Users/mmngreco/miniconda3/envs/pandas-dev/lib/python3.6/site-packages/pandas/core/indexes/datetimes.py", line 324, in __new__ ambiguous=ambiguous) File "/Users/mmngreco/miniconda3/envs/pandas-dev/lib/python3.6/site-packages/pandas/core/indexes/datetimes.py", line 531, in _generate index = _generate_regular_range(start, end, periods, offset) File "/Users/mmngreco/miniconda3/envs/pandas-dev/lib/python3.6/site-packages/pandas/core/indexes/datetimes.py", line 2009, in _generate_regular_range dates = list(xdr) File "/Users/mmngreco/miniconda3/envs/pandas-dev/lib/python3.6/site-packages/pandas/tseries/offsets.py", line 2960, in generate_range end = start + (periods - 1) * offset File "/Users/mmngreco/miniconda3/envs/pandas-dev/lib/python3.6/site-packages/pandas/tseries/offsets.py", line 425, in __rmul__ return self.__mul__(someInt) File "/Users/mmngreco/miniconda3/envs/pandas-dev/lib/python3.6/site-packages/pandas/tseries/offsets.py", line 422, in __mul__ **self.kwds) File "/Users/mmngreco/miniconda3/envs/pandas-dev/lib/python3.6/site-packages/pandas/tseries/offsets.py", line 1671, in __init__ raise ValueError('N cannot be 0') ValueError: N cannot be 0Problem description
If N is equal to periods then is not 0 as we can see, that make me think that probably there is something wrong in the code.
Expected Output
Out[33]: DatetimeIndex(['2010-01-04'], dtype='datetime64[ns]', freq='WOM-1MON')Output of pd.show_versions()
pd.show_versions()
INSTALLED VERSIONS
commit: None
python: 3.6.4.final.0
python-bits: 64
OS: Darwin
OS-release: 17.4.0
machine: x86_64
processor: i386
byteorder: little
LC_ALL: None
LANG: None
LOCALE: es_ES.UTF-8
pandas: 0.22.0
pytest: 3.4.2
pip: 9.0.1
setuptools: 38.5.1
Cython: 0.27.3
numpy: 1.14.2
scipy: 1.0.0
pyarrow: 0.9.0
xarray: 0.10.2
IPython: 6.2.1
sphinx: 1.7.1
patsy: 0.5.0
dateutil: 2.7.0
pytz: 2018.3
blosc: None
bottleneck: 1.2.1
tables: 3.4.2
numexpr: 2.6.4
feather: 0.4.0
matplotlib: 2.2.2
openpyxl: 2.5.1
xlrd: 1.1.0
xlwt: 1.2.0
xlsxwriter: 1.0.2
lxml: 4.2.0
bs4: 4.6.0
html5lib: 1.0.1
sqlalchemy: 1.2.5
pymysql: 0.8.0
psycopg2: None
jinja2: 2.10
s3fs: 0.1.3
fastparquet: 0.1.4
pandas_gbq: None
pandas_datareader: None