I'm using pycharm.2017.1.2. I installed anaconda2 with py3 environment. in Pycharm, I'm using Python3 interpreter, and the code is simply:

print(__name__)

In Python console in Pycharm, it prints builtins.

If I click the 'run' button, it prints main as expected.

Why does the PyCharm Python console print builtin instead of main?

PyCharm Python console is actually running a module called pydevconsole.py (should be located in C:\Program Files\JetBrains\PyCharm 2017.1.2\helpers\pydev\pydevconsole.py). This module creates an interpreter and sets it as an attribute to the builtins module.

Thus print(__name__) on PyCharm console will show builtins.

During execution (when you click 'run'), your specified Python interpreter is called, not the pydevconsole module. therefore print(__name__) shows __main__ as expected.