fix #74, may has some problems
Merge pull request #75 from xiechao06/issue74

fix #74, may has some problems
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fix #74, may has some problems
fix #49
fix #47
Merge branch 'master' of https://github.com/xiechao06/Flask-Report
fix error
Merge branch 'master' of https://github.com/xiechao06/Flask-Report into issue9
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