Ned Deily added the comment:
Unfortunately, it may depend on what environment and/or from which distributor you obtain Python 3.6 as to whether there is a "python3" link installed. On Unix-like systems, the default Python installation built from source ("make install") does install both "python3.6" and "python3" links in the configured "bin" directory. But that may not be true everywhere. On what environment are you running Python 3.6 and from where was it installed?
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nosy: +ned.deily
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Python tracker
https://bugs.python.org/issue32553
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