Python Cookbook > Algorithms > Wrapping an Unbounded Iterator to Restrict Its Output

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Python Cookbook

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Foreword

Preface

Ch. 1. Python Shortcuts

Ch. 2. Searching and Sorting

Ch. 3. Text

Ch. 4. Files

Ch. 5. Object-Oriented Programming

Ch. 6. Threads, Processes, and Synchronization

Ch. 7. System Administration

Ch. 8. Databases and Persistence

Ch. 9. User Interfaces

Ch. 10. Network Programming

Ch. 11. Web Programming

Ch. 12. Processing XML

Ch. 13. Distributed Programming

Ch. 14. Debugging and Testing

Ch. 15. Programs About Programs

Ch. 16. Extending and Embedding

Ch. 17. Algorithms

Introduction

Testing if a Variable Is Defined

Evaluating Predicate Tests Across Sequences

Removing Duplicates from a Sequence

Removing Duplicates from a Sequence While Maintaining Sequence Order

Simulating the Ternary Operator in Python

Counting Items and Sorting by Incidence (Histograms)

Memoizing (Caching) the Return Values of Functions

Looking Up Words by Sound Similarity

Computing Factorials with lambda

Generating the Fibonacci Sequence

Wrapping an Unbounded Iterator to Restrict Its Output

Operating on Iterators

Rolling Dice

Implementing a First-In First-Out Container

Modeling a Priority Queue

Converting Numbers to Rationals via Farey Fractions

Evaluating a Polynomial

Module: Finding the Convex Hull of a Set of 2D Points

Module: Parsing a String into a Date/Time Object Portably

Ch. 16. List of Contributors

Colophon

Index

17.12. Wrapping an Unbounded Iterator to Restrict Its Output

Credit: Tom Good

17.12.1. Problem

You need to filter the sequence produced by a potentially unbounded Python 2.2 iterator or limit the sequence length by a condition.

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Contents

Chapter 17. Algorithms > Wrapping an Unbounded Iterator to Restrict Its Output

17.12. Wrapping an Unbounded Iterator to Restrict Its Output

17.12.1. Problem