eryksun added the comment:

`idle.pyw -E` passes an invalid argument, and pythonw.exe doesn't inherit the 
console to print the usage text to stderr. The -E option needs to be passed to 
the interpreter:

    C:\Python34>pythonw.exe -E Lib/idlelib/idle.pyw

Or run idlelib as a script:

    pyw -3 -Em idlelib

----------
nosy: +eryksun

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<http://bugs.python.org/issue15780>
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