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CLN: Use dedup_names for column name mangling in Python parser (#50371) #61670

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CLN: Use dedup_names for column name mangling in Python parser (#50371) #61670

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36 changes: 3 additions & 33 deletions pandas/io/parsers/python_parser.py
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Original file line number Diff line number Diff line change
Expand Up @@ -628,39 +628,9 @@ def _infer_columns(
this_columns.append(c)

if not have_mi_columns:
counts: DefaultDict = defaultdict(int)
# Ensure that regular columns are used before unnamed ones
# to keep given names and mangle unnamed columns
col_loop_order = [
i
for i in range(len(this_columns))
if i not in this_unnamed_cols
] + this_unnamed_cols

# TODO: Use pandas.io.common.dedup_names instead (see #50371)
for i in col_loop_order:
col = this_columns[i]
old_col = col
cur_count = counts[col]

if cur_count > 0:
while cur_count > 0:
counts[old_col] = cur_count + 1
col = f"{old_col}.{cur_count}"
if col in this_columns:
cur_count += 1
else:
cur_count = counts[col]

if (
self.dtype is not None
and is_dict_like(self.dtype)
and self.dtype.get(old_col) is not None
and self.dtype.get(col) is None
):
self.dtype.update({col: self.dtype.get(old_col)})
this_columns[i] = col
counts[col] = cur_count + 1
from pandas.io.common import dedup_names
this_columns = dedup_names(this_columns, is_potential_multiindex=False)

elif have_mi_columns:
# if we have grabbed an extra line, but its not in our
# format so save in the buffer, and create an blank extra
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