在Python程序中嵌入SQL语句时，想动态传入参数，即
sql = "insert into course VALUES({}, {}, {})"
可惜出现大规模报错。。。
pymysql.err.InternalError: (1054, "Unknown column '物理' in 'field list'")
但还好最后解决了——将Value中的每一个占位符都加一个引号，即
sql = "insert into course VALUES('{}', '{}', '{}')"
pymysql.err.InternalError:
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