日期时间模块-ValueError try / except无法正常工作python 3

问题描述

限时删除！！

我有一个编程作业。一切都进行得很顺利，直到使用Try / Except遇到问题为止。如果我输入有效的日期时间，程序将使用它并继续运行，但是如果我使用有效的日期时间格式，则异常不会响应。

I have a programming homework assignment. Everything went smoothly until I reached a problem using Try/Except. If I type a valid datetime, the program will take it and it will move on, but if I use a valid datetime format, the exception won't react.

此处是我的代码：

 import datetime
import csv


def get_stock_name(prompt,mode):
    while True:
        try:
            return open(input(prompt) + ".csv")
        except FileNotFoundError:
            print("File not found. Please try again.")
        except IOError:
            print("There was an IOError opening the file. Please try again.")


def get_stock_date(prompt):
    while True:
        try:
            return (input(prompt))
        except TypeError:
            print("Try again.")
        except ValueError:
            print("Try again.")


def get_stock_purchased(prompt):
    while True:
        try:
            return (input(prompt))
        except ValueError:
            print("Try again.")
        except TypeError:
            print("try again.")


stock_name = get_stock_name("Enter the name of the file ==> ", "w")

stock_date = datetime.datetime.strptime(get_stock_date("Enter the stock purchase date ==> " , "%m/%d/%Y"))

stock_sold = datetime.datetime.strptime(get_stock_date("Enter the date you sold the stock ==>" , "%m/%d/%Y"))

stock_purchased = get_stock_purchased("How many stocks were purchased on start date ==>")

推荐答案

为阐明Tigerhawk的最初评论：为了使try-catch处理TypeError或ValueError，您需要在try语句中将输入转换为datetime。

To clarify Tigerhawk's initial comment: in order for the try-catch to handle TypeError or ValueError, you need to cast the input to datetime in the try statement.

import datetime

def get_stock_date(prompt):
  while True:
    try:
      return datetime.datetime.strptime(input(prompt), "%m/%d/%Y")
    except (ValueError, TypeError):
      print("Try again.")

stock_date = get_stock_date("Enter the stock purchase date ==> ")

此外，您的姓名首字母帖子中有奇怪的ind该语句看起来像是您递归调用get_stock_date，这引起了混乱。

Additionally, your initial post had strange indentation that made it look like you were making a recursive call to get_stock_date, which caused confusion.

最后，如果您使用的是Python 2，则需要使用raw_input。

Lastly, you will need to use raw_input if you're using Python 2.

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