字符串索引超出python范圍？

Question

我正在用python創建一個安全登錄程序，並且不斷收到此錯誤消息： IndexError: string index out of range.

錯誤是針對line character=password[c] 。 我正在檢查用戶輸入的密碼是否有數字。 如果沒有數字，則密碼無效。 我該如何解決？

while c<numbercharacters:
    character=password[c] 
    c=c+1
    while character!="1" and character!="2" and character!="3" and character!="4" and character!="5" and character!="6" and character!="7" and character!="8" and character!="9" and character!=0: #checking if password has a number
        print "This password is not valid, it does not contain a number. Please create another." 
        password= raw_input ()
        numbercharacters=len(password) 
        character=password[c] 

c是計數器的變量。

Answer 1

當您獲得新的密碼輸入時（由於無效），您無需將計數器c重置為零即可再次從頭開始檢查過程。

# After this block
password= raw_input ()
numbercharacters=len(password) 
# Reset your counter to zero
c = 0
character=password[c]

您也可以簡單地使用以下任一方法為字符檢查數字

while not character.isdigit():
# or 
while character not in '0123456789':

Answer 2

如果要檢查是否有電話號碼，您可以做

password= raw_input ()
if not any(character.isdigit() for character in password):
    print "This password is not valid, it does not contain a number. Please create another." 

如果您想重新詢問密碼直到輸入密碼

 password= raw_input ()
 if not any(character.isdigit() for character in password):
    while not any(character.isdigit() for character in password):
        print "This password is not valid, it does not contain a number. Please create another." 
        password= raw_input ()