STY: Add strict=True to zip() calls in pandas/core/reshape/concat.py (pandas-dev#62983)

Author: IngramBJ

pandas/core/reshape/concat.py

@@ -866,13 +866,13 @@ def _make_concat_multiindex(indexes, keys, levels=None, names=None) -> MultiInde
  # things are potentially different sizes, so compute the exact codes
  # for each level and pass those to MultiIndex.from_arrays
 
- for hlevel, level in zip(zipped, levels):
+ for hlevel, level in zip(zipped, levels, strict=True):
  to_concat = []
  if isinstance(hlevel, Index) and hlevel.equals(level):
  lens = [len(idx) for idx in indexes]
  codes_list.append(np.repeat(np.arange(len(hlevel)), lens))
  else:
- for key, index in zip(hlevel, indexes):
+ for key, index in zip(hlevel, indexes, strict=True):
  # Find matching codes, include matching nan values as equal.
  mask = (isna(level) & isna(key)) | (level == key)
  if not mask.any():
@@ -922,7 +922,7 @@ def _make_concat_multiindex(indexes, keys, levels=None, names=None) -> MultiInde
 
  # do something a bit more speedy
 
- for hlevel, level in zip(zipped, levels):
+ for hlevel, level in zip(zipped, levels, strict=True):
  hlevel_index = ensure_index(hlevel)
  mapped = level.get_indexer(hlevel_index)