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Project Description

Implements Brace Expansion as described in bash(1), with the following limitations:

  • A pattern containing unbalanced braces will raise an UnbalancedBracesError exception. In bash, unbalanced braces will either be partly expanded or ignored.
  • A mixed-case character range like '{Z..a}' or '{a..Z}' will not include the characters []^_` between Z and a.

braceexpand is tested with Python 2.6, 2.7, 3.2, 3.3, 3.4.

Installation

Drop the braceexpand.py file into your project, or install the braceexpand package from pypi:

$ pip install braceexpand

Examples

The braceexpand function returns an iterator over the expansions generated from a pattern.

>>> from braceexpand import braceexpand

# Integer range
>>> list(braceexpand('item{1..3}'))
['item1', 'item2', 'item3']

# Character range
>>> list(braceexpand('{a..c}'))
['a', 'b', 'c']

# Sequence
>>> list(braceexpand('index.html{,.backup}'))
['index.html', 'index.html.backup']

# Nested patterns
>>> list(braceexpand('python{2.{5..7},3.{2,3}}'))
['python2.5', 'python2.6', 'python2.7', 'python3.2', 'python3.3']

# Prefixing an integer with zero causes all numbers to be padded to
# the same width.
>>> list(braceexpand('{07..10}'))
['07', '08', '09', '10']

# An optional increment can be specified for ranges.
>>> list(braceexpand('{a..g..2}'))
['a', 'c', 'e', 'g']

# Ranges can go in both directions.
>>> list(braceexpand('{4..1}'))
['4', '3', '2', '1']

# Unbalanced braces raise an exception.
>>> list(braceexpand('{1{2,3}'))
Traceback (most recent call last):
    ...
UnbalancedBracesError: Unbalanced braces: '{1{2,3}'

# By default, the backslash is the escape character.
>>> list(braceexpand(r'{1\{2,3}'))
['1{2', '3']

# Setting 'escape' to False disables backslash escaping.
>>> list(braceexpand(r'\{1,2}', escape=False))
['\\1', '\\2']

License

braceexpand is licensed unter the MIT License. See the included file LICENSE for details.

Release History

Release History

0.1.2

This version

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0.1.1

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0.1

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Download Files

Download Files

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File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
braceexpand-0.1.2.tar.gz (5.9 kB) Copy SHA256 Checksum SHA256 Source Aug 31, 2015

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