[遍历直到遇到特定值]不断遍历，直到遇到一个特定值为止 #python

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[遍历直到遇到特定值]不断遍历，直到遇到一个特定值为止 #python

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Last edited Feb 18, 2019

Created on Feb 18, 2019

This example demonstrates how to iterate over data until a specific sentinel value is encountered, using Python’s built-in `iter` function with a callable and a sentinel argument. It shows reading a text file in fixed-size chunks—10 characters at a time—via `f.read(10)` inside a lambda, stopping when an empty chunk is returned. The visualization highlights the mechanism of `iter` with a sentinel: the first parameter must be callable when a sentinel is present, unlike the standard iterable-only form. This pattern is useful for terminating loops based on data content rather than a fixed count.

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