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#!/usr/bin/env python
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
import sys
MAIN_DISPLAY_IMPORT = 'from __main__ import display'
def main():
for path in sys.argv[1:] or sys.stdin.read().splitlines():
with open(path, 'r') as f:
for i, line in enumerate(f.readlines()):
if MAIN_DISPLAY_IMPORT in line:
lineno = i + 1
colno = line.index(MAIN_DISPLAY_IMPORT) + 1
print('%s:%d:%d: Display is a singleton, just import and instantiate' % (path, lineno, colno))
if __name__ == '__main__':
main()
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