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Update : In DataFrame Class, Columns should not contain duplicate val… #34512

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Update : In DataFrame Class, Columns should not contain duplicate val… #34512

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7 changes: 7 additions & 0 deletions pandas/core/frame.py
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Original file line number Diff line number Diff line change
Expand Up @@ -357,6 +357,8 @@ class DataFrame(NDFrame):
columns : Index or array-like
Column labels to use for resulting frame. Will default to
RangeIndex (0, 1, 2, ..., n) if no column labels are provided.
Columns Labels should not contain duplicate values, if column
labels are provided.
dtype : dtype, default None
Data type to force. Only a single dtype is allowed. If None, infer.
copy : bool, default False
Expand Down Expand Up @@ -442,6 +444,11 @@ def __init__(
data = {}
if dtype is not None:
dtype = self._validate_dtype(dtype)

#We need columns to have unique labels.
if columns != None:
if len(columns) != len(set(columns)):
raise Exception("Columns should not contain duplicate values.")

if isinstance(data, DataFrame):
data = data._mgr
Expand Down