Flask reports an error: pymysq1.err OperationalError:(1054, “Unknown column ‘None‘ in ‘field list‘“)

Project scenario ：

Use flask Building framework Connect mysql Error occurs when inserting data into the table
pymysq1.err.OperationalError:(1054, "Unknown column 'None' in 'field list'")
“ The unknown column in the field list is None”

Screenshot of error reporting

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Cause analysis ：

primary sql sentence : sql = f"""insert into user values ({uname}, {pwd}, {mobile}, {email})"""
sql Statement did not get data , Field has no value

Solution ：

The field has no value, indicating that the front end has not obtained
Front end data acquisition form It is amended as follows json

    uname = request.json.get('zh')
    pwd = request.json.get('mm')
    mobile = request.json.get('mobile')
    email = request.json.get('email')

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