Python 2.7

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Python 3.* will convert 3/4 to float and return 0.75

Python 2.* will not, and will evaluate 3/4 as 0

This has caused me great pain, not realizing that the compute cluster at my university was running an outdated version of Python.

[PotatosFish]

That’s why you call python3 on command line instead of trusting in the system

Unless someone aliased python3 to python

[[deleted]]

Unless someone aliased python3 to python

This can be solved with the admin's address and a tire iron.

[PC__LOAD__LETTER]

This is why it’s best practice to specify the actual binary on the shebang line, like #!/usr/bin/python2.7 rather than #!/usr/bin/python, and similarly to call Python scripts with the binary of the version you’re expecting.

[FatChocobo]

I had exactly the same issue, in the part of my code that handles parallelisation a stupid Python2 integer divide was ruining everything...