A pandas DataFrame with 100 rows and 3 columns. Nulls: 100. Memory: 2.8 KB. Columns: c (float64, 100 nulls), a (int64, stats: range 0 to 99, mean 50, std 29), b (str, cardinality: 100 unique values (likely identifiers)). Sample row: {'a': '0', 'b': "'s0'", 'c': 'nan'}.