相关疑难解决方法(0)

我想将数据[1,2,'a','He said "what do you mean?"']转换为csv格式的字符串.

通常人们可以使用csv.writer()它,因为它处理所有疯狂的边缘情况(逗号转义,引用标记转义,CSV方言等).捕获是csv.writer()期望输出到文件对象,而不是字符串.

我目前的解决方案是这个有点hacky函数:

def CSV_String_Writeline(data):
    class Dummy_Writer:
        def write(self,instring):
            self.outstring = instring.strip("\r\n")
    dw = Dummy_Writer()
    csv_w = csv.writer( dw )
    csv_w.writerow(data)
    return dw.outstring

任何人都可以提供更优雅的解决方案,仍能很好地处理边缘情况吗？

编辑:这是我最终如何做到这一点:

def csv2string(data):
    si = StringIO.StringIO()
    cw = csv.writer(si)
    cw.writerow(data)
    return si.getvalue().strip('\r\n')

我刚开始使用Flask/Python.我想要实现的是我的HTML中有一个下载按钮,它调用以下函数:

function downloadPlotCSV() {
        $.ajax({
            url: "/getPlotCSV",
            type: "post",
            success: function(data) {
                dataPlot = JSON.parse(data);
                console.log(dataPlot);
            }
        });
    }

不完整的烧瓶代码是:

@app.route('/getPlotCSV', methods = ['POST'])
def plotCSV():
    data = open("outputs/Adjacency.csv")

我面临的问题是我找不到下载此csv文件或将其作为JSON字符串返回的方法,因此我可以使用Javascript下载它.知道如何将其作为JSON发送或者通过Flask本身下载它吗？什么是最好的方式？

我有一个example.csv包含内容的文件

1,"A towel,",1.0
42," it says, ",2.0
1337,is about the most ,-1
0,massively useful thing ,123
-2,an interstellar hitchhiker can have.,3

我如何example.csv用Python 阅读？

同样,如果我有

data = [(1, "A towel,", 1.0),
        (42, " it says, ", 2.0),
        (1337, "is about the most ", -1),
        (0, "massively useful thing ", 123),
        (-2, "an interstellar hitchhiker can have.", 3)]

如何data使用Python 写入CSV文件？

在Flask框架之外编写CSV没有问题.但是当我尝试从Flask写入它时,它会写入CSV,但只能在一行上写入.

这是我正在关注的模板

@app.route('/download')
def download():
    csv = """"REVIEW_DATE","AUTHOR","ISBN","DISCOUNTED_PRICE"
"1985/01/21","Douglas Adams",0345391802,5.95
"1990/01/12","Douglas Hofstadter",0465026567,9.95
"1998/07/15","Timothy ""The Parser"" Campbell",0968411304,18.99
"1999/12/03","Richard Friedman",0060630353,5.95
"2004/10/04","Randel Helms",0879755725,4.50"""
    response = make_response(csv)
    response.headers["Content-Disposition"] = "attachment; filename=books.csv"
    return response

这完全可以写入CSV,但是当我尝试使用我的代码时,我会得到一个长行.

我的代码:

@app.route('/download')
def post(self):

    # lots of code

    csvList.append([all,my,data,goes,here])

    csvList = str(re.sub('\[|\]','',str(csvList)))  # convert to a string; remove brackets

    response = make_response(csvList)
    response.headers['Content-Disposition'] = "attachment; filename=myCSV.csv"
    return response

我的输出:

Nashville Physician Service Ce,Treasury Specialist,Brentwood,TN,(615) 507-1646,La Petite Academy,Afternoon Teacher Aide,Goodlettsville,TN,(615) 859-2034,Nashville Physician Service Ce,Denial Resolution Specialist,Brentwood,TN,(615) 507-1646

谢谢.

编辑:我尝试了所有的答案,他们在大多数情况下工作,但我选择了vectorfrog,因为它符合我想要完成的任务.