使用 Flask 和 Python 检索 HTML 表单数据并存储在 csv 中

Question

我有一个小的 .py 程序，渲染 2 个 HTML 页面。其中一个 HTML 页面中有一个表单。要求姓名和评论的基本表格。我不知道如何从表单中获取名称和评论并将其存储到 csv 文件中。我已经获得了编码，以便在 HTML 页面上打印/返回我已经手动输入到 csv 文件中的非常少的内容，这是目标之一。但是我无法将输入到表单中的数据放入 csv 文件中，然后返回 HTML 页面。我觉得这是一个简单的解决方法，但是 Flask 书对我来说完全没有意义，我有阅读障碍，我发现无法理解示例和书面解释。

This is the code I have for reading the csv back onto the page;

   @app.route('/guestbook')
        def guestbook(): 
            with open('nameList.csv','r') as inFile:
                reader=csv.reader(inFile)
                names=[row for row in reader]
            return render_template('guestbook.html',names=names[1:])


And this is my form coding;
    <h3 class="tab">Feel free to enter your comments below</h3>
            <br />
            <br />
            <form action="" method="get" enctype="text/plain" name="Comments Form">
            <input id="namebox" type="text" maxlength="45" size="32" placeholder="Name"
            class="tab"/>
            <br />
            <textarea id="txt1" class="textbox tab" rows="6" placeholder="Your comment"
            class="tab" cols="28"></textarea>
            <br />
            <button class="menuitem tab" onclick="clearComment()" class="tab">Clear
            comment</button>
            <button class="menuitem" onclick="saveComment()" class="tab">Save comment</button>
            <br>
            </div>

Answer 1

据我了解，您只需要将数据保存到文件中，而您不知道如何在 Flask 中处理此问题，我将尝试用尽可能清晰的代码进行解释：

# request is a part of Flask's HTTP requests
from flask import request
import csv

# methods is an array that's used in Flask which requests' methods are
# allowed to be performed in this route.
@app.route('/save-comment', methods=['POST'])
def save_comment():
    # This is to make sure the HTTP method is POST and not any other
    if request.method == 'POST':
        # request.form is a dictionary that contains the form sent through
        # the HTTP request. This work by getting the name="xxx" attribute of
        # the html form field. So, if you want to get the name, your input
        # should be something like this: <input type="text" name="name" />.
        name = request.form['name']
        comment = request.form['comment']

        # This array is the fields your csv file has and in the following code
        # you'll see how it will be used. Change it to your actual csv's fields.
        fieldnames = ['name', 'comment']

        # We repeat the same step as the reading, but with "w" to indicate
        # the file is going to be written.
        with open('nameList.csv','w') as inFile:
            # DictWriter will help you write the file easily by treating the
            # csv as a python's class and will allow you to work with
            # dictionaries instead of having to add the csv manually.
            writer = csv.DictWriter(inFile, fieldnames=fieldnames)

            # writerow() will write a row in your csv file
            writer.writerow({'name': name, 'comment': comment})

        # And you return a text or a template, but if you don't return anything
        # this code will never work.
        return 'Thanks for your input!'