update-java-alternatives
что бы установить вашу джаву ка дефолтную.List all java versions:update-java-alternatives --list
Set java version as default (needs root permissions):sudo update-java-alternatives --set /path/to/java/version
In [4]: a = "abc"
In [5]: b = a.replace("a", "1")
In [6]: print(a,b)
abc 1bc