First Pull Request


Index subclasses do not check parameters pandas-dev/pandas

#### Code Sample, a copy-pastable example if possible ```python In [2]: pd.CategoricalIndex([1,2,3], asdasdsa=None) Out[2]: CategoricalIndex([1, 2, 3], categories=[1, 2, 3], ordered=False, dty...

Created - 3 comments - Effort Medium Error Reporting good first issue

ENH: Improve error message when using DataFrame.from_items instead of DataFrame.from_records pandas-dev/pandas

User reported from an early version of pandas, but this is still present in master: ``` import pandas counters = [ ('a', 98172247543414), ('b', 7805009), ('c', 1172983), ...

Created - 4 comments - Difficulty Novice Effort Low Error Reporting good first issue

DOC/ERR: better error message on no common merge keys pandas-dev/pandas

Currently, merging two DataFrames on indices is not a default option. When the keyword argument `on` is not specified, `MergeError` is occurred. #### Code Sample and Problem Statement ```pyth...

Created - 4 comments - Docs Effort Low Error Reporting Reshaping good first issue

ERR: disallow non-hashables in Index construction & rename pandas-dev/pandas

```python from pandas import Index, DataFrame df = DataFrame(index=Index([1, 2, 3, 4]), columns=['A', 'B']) df.index.rename(['foo'], inplace=True) df.reset_index() ``` > -----------------...

Created - 4 comments - Effort Low Error Reporting Reshaping good first issue

Behaviour of Categorical inputs to sparse data structures pandas-dev/pandas

#### Code Sample, a copy-pastable example if possible ```python >>> import pandas as pd >>> c = pd.Categorical(list('abcabc')) >>> c [a, b, c, a, b, c] Categories (3, object): [a, b, c] >>...

Created - 5 comments - Effort Low Error Reporting Sparse good first issue

ERR: pivot_table when number of levels larger than int32 range pandas-dev/pandas

#### Code Sample, a copy-pastable example if possible ``` import pandas as pd dat = pd.DataFrame({'ind1':list(range(1337600))*2,'ind2':list(range(3040))*2*440,'count':[1]*2*1337600}) dat.pivo...

Created - 6 comments - Algos Effort Low Error Reporting Numeric good first issue

Multiarray searchsorted fails pandas-dev/pandas

#### Code Sample, a copy-pastable example if possible ```python pandas.MultiIndex([[0],["a"]], [[0],[0]]).searchsorted((1,"b")) ``` #### Problem description The entry `(1,"b")` should come...

Created - 9 comments - Effort Low Error Reporting MultiIndex good first issue

Raise ValueError When Attempting to Rank Object Dtypes pandas-dev/pandas

Referencing the comments in #19481, right now rank operations performed against objects have a few issues, namely that they: - Are inherently ambiguous, relying on lexical encoding AND - Are no...

Created - 9 comments - Effort Low Error Reporting Groupby good first issue

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