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madgraph/interface/common_run_interface.py
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                    '(eg MSTW 90%CL error sets) \nare not available in aMC@NLO + LHAPDF 5.x.x')
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        # check if the file exists, otherwise install it
 
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        # check if the file exists, otherwise install it:
 
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        # also check that the PDFsets dir exists, otherwise create it.
 
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        # if fails, install the lhapdfset into lib/PDFsets
 
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        if not os.path.isdir(pdfsets_dir):
 
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            try:
 
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                os.mkdir(pdfsets_dir)
 
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            except OSError:
 
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                pdfsets_dir = pjoin(self.me_dir, 'lib', 'PDFsets')
 
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        if pdfsetname and not os.path.exists(pjoin(pdfsets_dir, pdfsetname)):
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            self.install_lhapdf_pdfset(pdfsets_dir, pdfsetname)
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        # check taht the file has been installed in the global dir
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        if os.path.exists(pjoin(pdfsets_dir, filename)) or \
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           os.path.isdir(pjoin(pdfsets_dir, filename)):
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            logger.info('%s successfully donloaded and stored in %s' \
 
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            logger.info('%s successfully downloaded and stored in %s' \
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                    % (filename, pdfsets_dir))
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        #otherwise save it locally
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        else: