Question

我有一个Python函数，该函数从用户处获取输入并执行一条SQL语句：

def function_name(team, dept start_date, end_date):
    dwh = conn.cursor() ## DB Connection established
    if (team is None):
        dwh.execute(sql.SQL("""select name,dept from employee where group = (%s) and join_date between (%s) and (%s)"""), (group, start_date, end_date))
    elif (dept is None):
        dwh.execute(sql.SQL("""select name,team from employee where team = (%s) and join_date between (%s) and (%s)"""), (team, start_date, end_date))
    else:
        dwh.execute(sql.SQL("""select name,dept,team from employee where team = (%s) and dept =(%s) and join_date between (%s) and (%s)"""), (team, dept start_date, end_date))

当我尝试上面的代码时，它在用户提供所有输入时运行。如果未提供任何字段，则返回空输出。

编辑：

当我共享以下输入时返回输出：

function_name("team1", "dept1", "2018-01-01","2018-01-31")

但是，当我在下面输入内容时，它会返回一个空输出（它应该执行脚本的elif (dept is None):部分）

function_name("team1", "2018-01-01","2018-01-31")

Answer 1

如果包含团队和部门的输入行，这将很有帮助。

dept后缺少逗号，应修复用户定义的功能。此外，function_name输入应如下所示：

def function_name(team, dept, start_date, end_date):
    if (team is None):
        print ("team is none")
    elif (dept is None):
        print ("dept is none")
    else:
        print("else")

function_name(team='team1', dept='dept1', start_date='2018-01-01', end_date='2018-01-01')打印其他内容

function_name(team='team1', dept=None, start_date='2018-01-01', end_date='2018-01-01')

打印部门为空

function_name(team=None, dept='dept1', start_date='2018-01-01', end_date='2018-01-01')打印团队为空

Python-如果未传递所有参数，函数将不返回输出，并且不评估elif语句

1 个答案: