diff --git a/sources/tech/20181004 Functional programming in Python- Immutable data structures.md b/sources/tech/20181004 Functional programming in Python- Immutable data structures.md
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+Translating by StdioA
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 Functional programming in Python: Immutable data structures
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 Immutability can help us better understand our code. Here's how to achieve it without sacrificing performance.