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                通過operator函數將字符串轉換回運算符 [TOC] # 需求 由于某些需要,將一些運算符做了列表,以便后續的程序判斷傳入的字符串中是否包含該列表中的某一個運算符,如果包含,就用該運算符做運算. 但該運算符已經轉換是字符串了,沒有辦法做運算符用,經過全網搜索,發現`operator`函數可以實現本功能 ## 原始代碼 **代碼** ```python #代碼 condition='age > 20' cond_info=['>','<','='] for n in cond_info: if n in condition: print('ok',n,type(n)) if 30 n 20: print('okkk') ``` **輸出:** ![運行結果](https://www.github.com/noah-luo/imags/raw/master/year/1547457407701.png) 提示`n` 是錯誤的語法,應為這里的n是字符串,不是運算符 ## 改良代碼 **代碼** ```python condition = 'age > 20' import operator cond_info = {'>': operator.gt, '<': operator.lt, '=': operator.eq} for n in cond_info: if n in condition: print('ok',n,type(n)) if cond_info[n](30, 20): print('okkk') ``` **輸出** ``` ok > <class 'str'> okkk ```
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