Description of problem:
There's a syntax error in the Python statement in %py_byte_compile:

# that's what currently is in the macro
import py_compile, sys; [py_compile.compile(f, dfile=f.partition("$RPM_BUILD_ROOT")[2]], optimize=opt) for opt in range(2) for f in sys.argv[1:]]

# and that's how it should be
import py_compile, sys; [py_compile.compile(f, dfile=f.partition("$RPM_BUILD_ROOT")[2], optimize=opt) for opt in range(2) for f in sys.argv[1:]]

(There's one ']' to be removed.)


Version-Release number of selected component (if applicable):
python3-devel-3.5.3-3.fc25.x86_64

How reproducible:
Always

Steps to Reproduce:
Build a Python package that uses %py_byte_compile, e.g. waf.

Actual results:
[...]
+ xargs -0 /usr/bin/python2 -O -c 'import py_compile, sys; [py_compile.compile(f, dfile=f.partition("$RPM_BUILD_ROOT")[2]], optimize=opt) for opt in range(2) for f in sys.argv[1:]]'
  File "<string>", line 1
    import py_compile, sys; [py_compile.compile(f, dfile=f.partition("$RPM_BUILD_ROOT")[2]], optimize=opt) for opt in range(2) for f in sys.argv[1:]]
                                                                                          ^
SyntaxError: invalid syntax
+ :
[...]
+ xargs -0 /usr/bin/python3 -O -c 'import py_compile, sys; [py_compile.compile(f, dfile=f.partition("$RPM_BUILD_ROOT")[2]], optimize=opt) for opt in range(2) for f in sys.argv[1:]]'
  File "<string>", line 1
    import py_compile, sys; [py_compile.compile(f, dfile=f.partition("$RPM_BUILD_ROOT")[2]], optimize=opt) for opt in range(2) for f in sys.argv[1:]]
                                                                                          ^
SyntaxError: invalid syntax
+ :
[...]

Because of that, no compiled Python files are created, neither for Python2 nor for Python3.


Expected results:
Byte-compilation

Additional info:
As a side note, the "-r" option should be added to xargs, to prevent running in case no Python files are found by the find command.