Question

当我输入以下代码时，PyCharm说＆＃34; Expression可以进一步简化＆＃34;。这个陈述的简化版本是什么？

＆＃13;

protected void chgcontrybtn_Click(object sender, EventArgs e)
    {
        if (Request.Cookies["countryCookies"] != null)
        {
            Response.Cookies["countryCookies"].Expires = DateTime.Now.AddDays(-1);//to remove cookies

            Response.Redirect("Index.aspx");
        }

        else if (Request.Cookies["Location"] != null)
        {
            Response.Cookies["Location"].Expires = DateTime.Now.AddDays(-1);

            Response.Redirect("Index.aspx");
        }

    }

＆＃13;

Answer 1

空列表评估为假，所以你也可以这样做，这就是PyCharm可能会谈到的：

int main() {

    vector<GLfloat> targetVector; 
    targetVector.reserve(772538368); //Attempt2 to reserve. Also tried resize()

    vector<vector<vector<GLshort>>> my3DimensionalData;
    //build my3DimensionalData //no problem here.

    //targetVector.reserve(772538368); //Attempt1 to reserve.

    for (GLint rowIndex = 0; rowIndex < numberOfRows; rowIndex++)
    {
        for (GLint colIndex = 0; colIndex < numberOfCols; colIndex++)
        {
            for (GLint depthIndex = 0; depthIndex < numberOfDepths; depthIndex++)
            {
                //perform gymnastic here on my3DimensionalData and get data.

                /*initially I was getting bad_alloc while pushing back  
                 *elements in the following block.
                 *This led to Attempt1 and Attempt2 as shown above.
                 */
                targetVector.push_back(data1);
                targetVector.push_back(data2);
                ...
                targetVector.push_back(data7);
            }
        }
    }
}

有一些副作用，因为上面的代码会返回＆＃34;是的！＆＃34;每当列表为if not listA: return "yes!"时，空字符串（False），""，空字典（None），空集（{}）以及任何内容否则python会把它视为假的

如果listA == []更简化版本

1 个答案: