當python代碼報錯很詭異的錯誤時，可能是成對的符號丟失了一個

今天寫代碼時，編譯不過去，最後發現，配對符寫丟了一個：

import sys
import re
import codecs


class TestCls(object):
    def __init__(self):
        return None

    def ReadSqlFile(self, filename, encoding):
        with codecs.open(filename=filename, mode='r', encoding=encoding) as f:
            content = f.read()
        # sql文件,以"--"作爲註釋符(暫不支持其他註釋符),解析文件之前,先把註釋替換掉,否則影響解析
        # 正則表達式,零寬斷言,零寬度正預測先行斷言
        content = re.sub(r"--.*(?=[\r\n]+?)", "", content)
        # 以"CREATE TABLE IF NOT EXISTS"作爲建表的開始標誌,以");"作爲結束標誌
        patternTable = "(" + """CREATE TABLE IF NOT EXISTS[ \t]+""" + """(?P<tableName>[a-zA-Z0-9_]+)""" + """[ \t\r\n]*\(""" + """(?P<allFieldContent>[^;]+)""" + """\);""" + ")"
        # 定義字段時必須要帶"NULL"或"NOT NULL",否則解析不出來,例:
        # [colName] [colType] [NULL 或 NOT NULL] [後續字段(PRIMARY KEY等)]
        patternField = """([ \t]*(?P<colName>[a-zA-Z0-9_]+)[ \t]+(?P<colType>[a-zA-Z0-9\(\)]+)[ \t]+((NULL)|(NOT NULL))(?P<otherStr>.*))"""
        tableContentList = re.findall(patternTable, content)
        for tableContent in list(zip(*tableContentList))[0]:
            sreMatch = re.match(patternTable, tableContent)
            tableName = sreMatch.groupdict()["tableName"]
            allFieldContent  = sreMatch.groupdict(["allFieldContent"]
            #allFieldContent = sreMatch.groupdict()["allFieldContent"]
            # 如果"()"等符號丟失了一個的話,會報錯出來很詭異的錯誤,此時應當意識到,可能丟失了配對符等.
            # 此時,建議使用排除法,一點一點的註釋掉代碼,找到出錯的代碼塊,然後仔細查找原因.
            fieldContentList = re.findall(patternField, allFieldContent)
            for fieldContent in list(zip(*fieldContentList))[0]:
                sreMatch = re.match(patternField, fieldContent)
                colName = sreMatch.groupdict()["colName"]
                colType = sreMatch.groupdict()["colType"]
                otherStr = sreMatch.groupdict()["otherStr"]
                print(colName)
                print(colType)
                print(otherStr)
        return None


if __name__ == "__main__":
    sqlStr = """
DROP TABLE IF EXISTS nnnnnn_etf_list;
CREATE TABLE IF NOT EXISTS nnnnnn_etf_list(
  date     INTEGER     NOT NULL,--日期
  code     VARCHAR(32) NOT NULL,--code
  field1   VARCHAR(64) NOT NULL,--字段1
  field2   VARCHAR(64)     NULL,--字段2
  field3   VARCHAR(64)     NULL,--字段3
  field4   VARCHAR(64)     NULL,--字段4
  field5   VARCHAR(64)     NULL,--字段5
  field6   VARCHAR(64)     NULL,--字段6
  PRIMARY KEY(date,code,field1)
);"""
    obj = TestCls()
    fileName = r"D:\sql.sql"
    obj.ReadSqlFile(fileName, 'utf8')
    sys.exit(0)

完。