pandas.Index.get_loc#
- Index.get_loc(key, method=None, tolerance=None)[source]#
Get integer location, slice or boolean mask for requested label.
- Parameters
- keylabel
- method{None, ‘pad’/’ffill’, ‘backfill’/’bfill’, ‘nearest’}, optional
default: exact matches only.
pad / ffill: find the PREVIOUS index value if no exact match.
backfill / bfill: use NEXT index value if no exact match
nearest: use the NEAREST index value if no exact match. Tied distances are broken by preferring the larger index value.
- toleranceint or float, optional
Maximum distance from index value for inexact matches. The value of the index at the matching location must satisfy the equation
abs(index[loc] - key) <= tolerance.
- Returns
- locint if unique index, slice if monotonic index, else mask
Examples
>>> unique_index = pd.Index(list('abc')) >>> unique_index.get_loc('b') 1
>>> monotonic_index = pd.Index(list('abbc')) >>> monotonic_index.get_loc('b') slice(1, 3, None)
>>> non_monotonic_index = pd.Index(list('abcb')) >>> non_monotonic_index.get_loc('b') array([False, True, False, True])