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I want to pick up Python3 from squeeze, meanwhile I would like to stay with lenny with all other packages. Is this possible by just modifying source.list file?

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Here are instructions for enabling and using backports in Debian.

Here is the page for Python3.

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Thanks, this is exactly what I want. – aXqd Apr 26 '10 at 6:20
Sorry, I just noticed python3 has not been included in lenny-backports. It is only in squeeze and sid. Is there any way to work around this? Also, I cannot find /etc/apt/preferences file in my debian system. – aXqd Apr 26 '10 at 6:59
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In the end, I took these steps:

  1. Create /etc/apt/apt.conf file with this line below:(including the semicolon)

    APT::Default-Release "stable";

  2. Change all 'lenny' to 'stable', and 'squeeze' to 'testing' in /etc/apt/source.list file;

  3. After 'apt-get update' command, 'apt-get upgrade' command reported no upgrades as expected;

  4. 'apt-cache search python3' worked fine now;

  5. 'apt-get -t testing install python3' command installed python3 without any problems.

However, I do still have some issues:

  1. Default-Release cannot be set to "lenny";
  2. Default-Release can be set to '4.0' and '5.0*', but not '5.0';
  3. These packages 'libncursesw5 libsqlite3-0 libssl0.9.8 and sqlite3' still got upgraded when I did 'apt-get -t testing install' command.
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