fix.py

#!/usr/bin/env python3
import sys
import json

total = err = 0
for line_no, line in enumerate(sys.stdin):
    try:
        d = eval(line.rstrip())
    except Exception as e:
        sys.stderr.write("Line {} was malformed: {}\n".format(line_no, e))
        err += 1
    else:
        json.dump(d, sys.stdout)
        sys.stdout.write('\n')
    finally:
        total += 1

sys.stderr.write("""\
Total tweets:  {}
Fixed tweets:  {}
Unsalvageable: {}
Proportion:    {:%}
""".format(total, total - err, err, err / total))