Article directory
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- Introduction
- Example 1: python, eval method comparison
- Example 2: eval, query comparison
- Example 3: numexpr.evaluate
- Example 4: @conforms to mark local variables
- Example 5: Multi-index MultiIndex
- Example 6: Multiple data df - with same column name (or index level/name)
- Example 9: in and not in
- Example 10: The Boolean operator not or the ~ operator negates a Boolean expression
- references
Introduction
The powerful python data science ecological environment is based on Numpy and Pandas, and converts basic operations into C language through intuitive syntax: vectorization/broadcasting operations in Numpy, and grouping operations in pandas. Although these abstract functions can solve many problems concisely and efficiently,