寫一個計算年齡的程式：
from datetime import datetime
dob = input("Enter your Date of Birth (yyyy-mm-dd): ")
dob_date = datetime.strptime(dob, "%Y-%m-%d")
print(dob_date)
current_date = datetime.now()
age = current_date.year - dob_date.year
print(f"Your age is {age}")
datetime.now() -datetime.now() 是 Python 的 datetime 模組中的函數，它以 datetime 物件的形式傳回目前本機日期和時間，包括微秒。
strptime() - Python 中的 strptime() 方法用於將表示日期和/或時間的字串解析（轉換）為日期時間物件。它是日期時間模組的一部分。
Enter your Date of Birth (yyyy-mm-dd): 1993-03-26 1993-03-26 00:00:00 Your age is 31
另一個方法：
如果結果為負數，請使用此方法
from datetime import date
birth_year = 1993
birth_month = 3
birth_day = 26
today = date.today()
year = today.year - birth_year
month = today.month - birth_month
days = today.day - birth_day
if month<0:
year = year - 1
month = 12+month
if days<0:
month=month-1
days = 30 + days
print (f"You are {year} Years {month} Months {days} Days Old")
You are 31 Years 7 Months 29 Days Old
使用relativedelta的替代方法：
from datetime import datetime
from dateutil.relativedelta import relativedelta
dob = input("Enter date of birth in yyyy-mm-dd format: ")
dob_date = datetime.strptime(dob, "%Y-%m-%d")
today = datetime.now()
difference = relativedelta(today, dob_date)
print(difference.years, " Years ", difference.months, " Months ", difference.days, " days")
relativedelta 是 Python 中 dateutil 模組的一部分，它提供了比標準函式庫的 timedelta 更強大的日期和時間操作操作。它允許您執行諸如添加或減去月份和年份之類的操作，而 timedelta 無法直接處理這些操作。
Enter date of birth in yyyy-mm-dd format: 1993-03-26 31 Years 7 Months 30 days
while 循環的一些例子：
no = 1
while no<=5:
print(no, end=' ')
no+=1
1 1 1 1 1
no = 1
while no<=10:
print(no, end=' ')
no+=1
1 2 3 4 5 6 7 8 9 10
no = 10
while no>=1:
print(no, end=' ')
no-=1
10 9 8 7 6 5 4 3 2 1
no = 1
while no<=10:
print(no, end=' ')
no+=2
1 3 5 7 9
no=2
while no<=10:
print(no, end=' ')
no+=2
2 4 6 8 10
no = 3
while no<=10:
print(no, end=' ')
no+=3
3 6 9
no = 1
total = 0
while no<=5:
total = total + no
no+=1
print(total)
15
no = 1
while no<=5:
print(no*3, end=' ')
no+=1
3 6 9 12 15
no = 1
while no<=10:
print(no,"*5=",no*5, end='\n')
no+=1
1 *5= 5 2 *5= 10 3 *5= 15 4 *5= 20 5 *5= 25 6 *5= 30 7 *5= 35 8 *5= 40 9 *5= 45 10 *5= 50
no = 1
while no<=10:
print(no, end = ' ')
if no==9:
no = 0
no+=2
1 3 5 7 9 2 4 6 8 10
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