沒有輸入/無效輸入的Python日期驗證

該計劃的目標是：

1. 驗證輸入格式，日期范圍不應超過 2 個月
2. 無輸入/無效輸入 -> 根據當月日期回傳當前月的上半月或下半月
3. 上半年是從第 1 天到第 15 天，下半年是從第 16 天到月底

硬代碼（將是第一個代碼片段）以正確的輸出按預期作業，但是第二個代碼片段中的日期驗證不會跳轉到 except 塊中指示的方法，這導致我出現問題并且不顯示正確的輸出.

import os, sys
import datetime as dt

if __name__ == '__main__':
    validate_range('2003/12/23', '2003/12/22')
    validate_range('2003/10/23', '2003/11/22')
    validate_range('2003/12/23', '2003/10/22')
    validate_range('2003/7/23', '2003/10/22')

具有正確輸出的代碼段（不檢查日期是否格式正確）：

def validate_range(first_date, second_date):
    start_date = dt.datetime.strptime(first_date, '%Y/%m/%d')  # Get first date
    end_date = dt.datetime.strptime(second_date, '%Y/%m/%d')  # Get second date

    num_months = (end_date.year - start_date.year) * 12   (
            end_date.month - start_date.month)  # Get year/month within 2 months

    if num_months >= 0 and num_months <= 2:
        print("In Range")
    else:
        current_day = dt.datetime.today().day

        if current_day >= 1 and current_day <= 15:
            print("First half")
        if current_day >= 16 and current_day <= 32:
            print("Second half")

正確的輸出：

In Range
In Range
First half
First half

不顯示正確輸出的代碼片段（帶有日期驗證）：

def read_args(first_date, second_date):
    try:
        start_date = dt.datetime.strptime(first_date, '%Y/%m/%d')  # Get first date
        end_date = dt.datetime.strptime(second_date, '%Y/%m/%d')  # Get second date
        v_range(start_date, end_date)
    except:
        w_range()


def v_range(first_date, second_date):
    num_months = (second_date.year - first_date.year) * 12   (
            second_date.month - first_date.month)  # Get year/month within 2 months
    if num_months >= 0 and num_months <= 2:
        print("In Range")


def w_range():
    current_day = dt.datetime.today().day

    if current_day >= 1 and current_day <= 15:
        print("First half")
    if current_day >= 16 and current_day <= 32:
        print("Second half")

輸出：

In Range
In Range

uj5u.com熱心網友回復：

保持您對try / except,的使用可能需要一些改進，但此示例表明這是可能的：

import os, sys
import datetime as dt


def read_args(first_date, second_date):
    try:
        start_date = dt.datetime.strptime(first_date, '%Y/%m/%d')  # Get first date
        end_date = dt.datetime.strptime(second_date, '%Y/%m/%d')  # Get second date
        result = v_range(start_date, end_date)
    except:
        pass
        # w_range()


def v_range(first_date, second_date):
    num_months = (second_date.year - first_date.year) * 12   (
            second_date.month - first_date.month)  # Get year/month within 2 months
    if num_months >= 0 and num_months <= 2:
        print("In Range")
    else:
        w_range()


def w_range():
    current_day = dt.datetime.today().day

    if current_day >= 1 and current_day <= 15:
        print("First half")
    if current_day >= 16 and current_day <= 32:
        print("Second half")


if __name__ == '__main__':
    read_args('2003/12/23', '2003/12/22')
    read_args('2003/10/23', '2003/11/22')
    read_args('2003/12/23', '2003/10/22')
    read_args('2003/7/23', '2003/10/22')

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