pythonFlask-Mail中的錯誤，我有KeyErrorMAIL_DEFAULT_SENDER或其他

`

import re
import os
from flask import Flask, request, render_template, current_app
from flask_mail import Mail, Message

app = Flask(__name__)

app.config['MAIL_DEFAULT_SENDER'] = os.environ['MAIL_DEFAULT_SENDER']
app.config["MAIL_PASSWORD"] = os.environ["MAIL_PASSWORD"]
app.config["MAIL_PORT"] = 587
app.config["MAIL_SERVER"] = "smtp.gmail.com"
app.config["MAIL_USE_TLS"] = True
app.config["MAIL_USERNAME"] = os.environ["MAIL_USERNAME"]
mail = Mail(app)

SPORTS = [
    "Basketball",
    "Soccer",
    "Ultimate Frisbee"
]

@app.route("/")

def index():
    return render_template("index.html", sports=SPORTS)

@app.route("/register", methods=["POST"])

def register():
    name = request.form.get("name")
    email = request.form.get("email")
    sport = request.form.get("sport")

    if not name or not email or sport not in SPORTS:
        return render_template("failure.html")

    message = Message("You are registered!", recipients=[email])
    mail.send(email)

    return render_template("success.html")

`

$ python -m flask run
Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "C:\Python311\Lib\site-packages\flask\__main__.py", line 3, in <module>
    main()
  File "C:\Python311\Lib\site-packages\flask\cli.py", line 1047, in main
    cli.main()
  File "C:\Python311\Lib\site-packages\click\core.py", line 1055, in main
    rv = self.invoke(ctx)
         ^^^^^^^^^^^^^^^^
  File "C:\Python311\Lib\site-packages\click\core.py", line 1657, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Python311\Lib\site-packages\click\core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Python311\Lib\site-packages\click\core.py", line 760, in invoke
    return __callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Python311\Lib\site-packages\click\decorators.py", line 84, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Python311\Lib\site-packages\click\core.py", line 760, in invoke
    return __callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Python311\Lib\site-packages\flask\cli.py", line 911, in run_command
    raise e from None
  File "C:\Python311\Lib\site-packages\flask\cli.py", line 897, in run_command
    app = info.load_app()
          ^^^^^^^^^^^^^^^
  File "C:\Python311\Lib\site-packages\flask\cli.py", line 308, in load_app
    app = locate_app(import_name, name)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Python311\Lib\site-packages\flask\cli.py", line 218, in locate_app
    __import__(module_name)
  File "C:\*my_folders*\*my_folders*\froshimsemail\app.py", line 8, in <module>
    app.config['MAIL_DEFAULT_SENDER'] = os.environ['MAIL_DEFAULT_SENDER']
                        

                ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen os>", line 678, in __getitem__
KeyError: 'MAIL_DEFAULT_SENDER'

上面的錯誤甚至是什么意思？我發現問題已經幾個小時了，我已經卸載并安裝了幾次，并檢查了我在正確的 python 解釋器上

通過這應該去cs50提問，因為它來自他們的課程，但我對如何解釋我的問題持懷疑態度。

uj5u.com熱心網友回復：

如果環境MAIL_DEFAULT_SENDER不存在，那么運行時會出現 KeyError os.environ['MAIL_DEFAULT_SENDER']。我認為這就是這里正在發生的事情。

一個解決方案可能是使用os.environ.get(). 這是您可以執行此操作的方法

app.config['MAIL_DEFAULT_SENDER'] = os.environ.get('MAIL_DEFAULT_SENDER')

如果存在，這將設定app.config['MAIL_DEFAULT_SENDER']為環境變數 MAIL_DEFAULT_SENDER 的值，否則設定為 None。

如果你愿意，你可以指定一個默認值作為第二個引數。

app.config['MAIL_DEFAULT_SENDER'] = os.environ.get('MAIL_DEFAULT_SENDER', 'default mail sender')

uj5u.com熱心網友回復：

多虧了“Hanan F”的建議，我在 os.environ 放置了 .get 和“MAIL_DEFAULT_SENDER”括號后使代碼作業，從方形變為圓形。

app.config['MAIL_DEFAULT_SENDER'] = os.environ.get('MAIL_DEFAULT_SENDER')
app.config["MAIL_PASSWORD"] = os.environ.get("MAIL_PASSWORD")
app.config["MAIL_PORT"] = 587
app.config["MAIL_SERVER"] = "smtp.gmail.com"
app.config["MAIL_USE_TLS"] = True
app.config["MAIL_USERNAME"] = os.environ.get("MAIL_USERNAME")
mail = Mail(app)

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