how to check for debug symbols on osx ?

After last submission of my py2app app to Mac App Store I've received email:

Missing DWARF data - Your app does not include DWARF data with architecture information in Contents/MacOS/Capturebox . In your Xcode build settings, ensure that the debug information is set to "DWARF with dSYM" and that the list of valid architectures does not include PPC.

When creating .app file with py2app be sure to set:

no_strip: True 

in your py2app options.

Existence of debug symbols could be easily checked with otool utility:

otool -Iv /Applications/Calculator.app/Contents/MacOS/Calculator

/Applications/Calculator.app/Contents/MacOS/Calculator:

Indirect symbols for (__TEXT,__stubs) 27 entries

address            index name

0x000000010000f454     8 _CalculateExpression

0x000000010000f45a    14 _NSClassFromString

0x000000010000f460    18 _NSHomeDirectory

....

If there is no output from otool debug symbols were probably removed by strip or some other tool.