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merged 1 commit into from
Nov 2, 2019
Merged

CLN: clean indexes/multi.py #29337

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51 changes: 27 additions & 24 deletions pandas/core/indexes/multi.py
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Original file line number Diff line number Diff line change
Expand Up @@ -704,22 +704,23 @@ def _set_levels(
# This is NOT part of the levels property because it should be
# externally not allowed to set levels. User beware if you change
# _levels directly
if validate and len(levels) == 0:
raise ValueError("Must set non-zero number of levels.")
if validate and level is None and len(levels) != self.nlevels:
raise ValueError("Length of levels must match number of levels.")
if validate and level is not None and len(levels) != len(level):
raise ValueError("Length of levels must match length of level.")
if validate:
if len(levels) == 0:
raise ValueError("Must set non-zero number of levels.")
if level is None and len(levels) != self.nlevels:
raise ValueError("Length of levels must match number of levels.")
if level is not None and len(levels) != len(level):
raise ValueError("Length of levels must match length of level.")

if level is None:
new_levels = FrozenList(
ensure_index(lev, copy=copy)._shallow_copy() for lev in levels
)
else:
level = [self._get_level_number(l) for l in level]
level_numbers = [self._get_level_number(lev) for lev in level]
new_levels = list(self._levels)
for l, v in zip(level, levels):
new_levels[l] = ensure_index(v, copy=copy)._shallow_copy()
for lev_num, lev in zip(level_numbers, levels):
new_levels[lev_num] = ensure_index(lev, copy=copy)._shallow_copy()
new_levels = FrozenList(new_levels)

if verify_integrity:
Expand Down Expand Up @@ -825,22 +826,23 @@ def labels(self):
def _set_codes(
self, codes, level=None, copy=False, validate=True, verify_integrity=False
):
if validate and level is None and len(codes) != self.nlevels:
raise ValueError("Length of codes must match number of levels")
if validate and level is not None and len(codes) != len(level):
raise ValueError("Length of codes must match length of levels.")
if validate:
if level is None and len(codes) != self.nlevels:
raise ValueError("Length of codes must match number of levels")
if level is not None and len(codes) != len(level):
raise ValueError("Length of codes must match length of levels.")

if level is None:
new_codes = FrozenList(
_ensure_frozen(level_codes, lev, copy=copy)._shallow_copy()
for lev, level_codes in zip(self._levels, codes)
)
else:
level = [self._get_level_number(l) for l in level]
level_numbers = [self._get_level_number(lev) for lev in level]
new_codes = list(self._codes)
for lev_idx, level_codes in zip(level, codes):
lev = self.levels[lev_idx]
new_codes[lev_idx] = _ensure_frozen(
for lev_num, level_codes in zip(level_numbers, codes):
lev = self.levels[lev_num]
new_codes[lev_num] = _ensure_frozen(
level_codes, lev, copy=copy
)._shallow_copy()
new_codes = FrozenList(new_codes)
Expand Down Expand Up @@ -1253,17 +1255,18 @@ def _set_names(self, names, level=None, validate=True):
raise ValueError("Names should be list-like for a MultiIndex")
names = list(names)

if validate and level is not None and len(names) != len(level):
raise ValueError("Length of names must match length of level.")
if validate and level is None and len(names) != self.nlevels:
raise ValueError(
"Length of names must match number of levels in MultiIndex."
)
if validate:
if level is not None and len(names) != len(level):
raise ValueError("Length of names must match length of level.")
if level is None and len(names) != self.nlevels:
raise ValueError(
"Length of names must match number of levels in MultiIndex."
)

if level is None:
level = range(self.nlevels)
else:
level = [self._get_level_number(l) for l in level]
level = [self._get_level_number(lev) for lev in level]

# set the name
for lev, name in zip(level, names):
Expand Down