cmp_version 1.0.2

Commandline Tool

You can use the provided cmp-version tool to compare two version strings.

It will print to stdout “-1” if version1 is less/older than version2, “0” if they are equal, and “1” if version1 is greater/newer than version2.

Examples:

$ ./cmp-version 1.0.1b 1.0.1a

1

$ ./cmp-version 1.0.1b 1.0.2

-1

$ ./cmp-version 1.0 1.0.0

0

Comparing Filenames

Without actually scanning the contents of a package, you can from a script compare the versions based on the filenames.

Example:

$ cmp-version glibc-6.2.1-3.x86_64.rpm glibc-6.2.3-1.x86_64.rpm

-1

Method Signature

The cmp_version module provides a single method, cmp_version which compares two versions “cmp” style (think strcmp or the “cmp” operator in python<3).

def cmp_version(version1, version2):

‘’’

cmp_version - Compare two version strings, checking which one represents a “newer” (greater) release.

Note that even if two version strings are not equal string-wise, they may still be equal version-wise (e.x. 1.0.0 is the same version as 1.0)

@param version1 <str> - A version string

@param version2 <str> - A version string

@return <int>

-1 if version1 is older/less than version2

0 if version1 is equal to version2

1 if version1 is newer/greater than version2

So for example,

cmp_version(‘1.0.5b’, ‘1.0.5a’) would return 1 because 1.0.5b comes after 1.0.5a

Sorting Lists

You can sort a list of versions, or filenames containing versions etc like this:

>>> from cmp_version import cmp_version

>>>

>>> x = ['1.12', '1.21', '1.01b']

>>> sorted(x, cmp=cmp_version)

[‘1.01b’, ‘1.12’, ‘1.21’]

Return value

• 0 is returned when the two versions are equal, even if the strings are not equal (for example “1.0” is the same version as “1.0.0”)

• -1 is returned when version1 is older/less than version2

• 1 is returned when version1 is newer/greater than version2.

License

This module is released under Public Domain.