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13. Generator Expressions

Like list comprehensions, but produce items lazily.

Example​

squares = (x*x for x in range(5))
for val in squares:
    print(val)

Difference from List Comprehension​

  • List comprehension: produces entire list in memory.
  • Generator expression: produces values one by one.

Wrap-Up​

  • Use generator expressions when working with large data or pipelines.