python - print to print as comma separated values on the same line -

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i unable print output on single line without printing new lines, following code shows syntax error: 

print( "tiers found:"+eval("str.lower(tier.attrib['tier_id'])"), end=', ')                                                                         ^ syntaxerror: invalid syntax

but works fine:

print( "tiers found:"+eval("str.lower(tier.attrib['tier_id'])"))

the print statement in loop , require print output comma separated list. whats problem here?

why using eval on sane statement?

from __future__ import print_function print('tiers found: {0}'.format(tier.attrib['tier_id'].lower()), end=',')

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