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[英]How can I keep prompting the user for input until the user enters an integer and non-0 value on Python using While loop?
[英]How to validate a string input in python using datetime library and keep prompting user for input until valid input?
我試過使用這個過程:
import datetime
date_string = input()
format = "%Y-%m-%d"
try:
datetime.datetime.strptime(date_string, format)
print("This is the correct date string format.")
except ValueError:
print("This is the incorrect date string format. It should be YYYY-MM-DD")
當我用“2021-3-3”填充 date_string 的輸入時,output 是
This is the correct date string format.
但是當我對“2021-03-03”做一點改動時,output 是
This is the incorrect date string format. It should be YYYY-MM-DD
我如何使第二個輸入為真。 所以,當我輸入“2021-03-03”時,output 也將是
This is the correct date string format.
我也想知道如何提示用戶,直到他輸入正確的格式,這樣當他輸入錯誤的格式或值時,output 是
This is the incorrect date string format, try again fill the
並且,程序不斷提示用戶輸入
此代碼適用於我的機器,如果不成功,它會提示用戶再次輸入。
import datetime
format = "%Y-%m-%d"
while(True):
date_string = input("> ").strip()
try:
datetime.datetime.strptime(date_string, format)
print("This is the correct date string format.")
break
except ValueError:
print("This is the incorrect date string format. It should be YYYY-MM-DD")
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