以下代码是我一直致力于的夏季项目：
from time import sleep
def valrep(x,change): #function goes through a file and replaces specific values
with open('users.txt', 'r') as file :
filedata = file.read()
for aline in open("users.txt","r").readlines():
word = aline.split()
if (word[0] == username) and (word[1] == user_password):
aline2 = aline.replace(word[x], change)
filedata = filedata.replace(aline,aline2)
with open('users.txt', 'w') as file:
file.write(filedata)
print("SUCCESS")
loop = False
while loop == False:
username = input("ENTER A VALID USERNAME>>> ")#splits the input into two seperate variables
user_password = input("ENTER A VALID 4 DIGIT PIN>>> ")
valnums = '1234567890' #gives a set of valid characters (used later in the program)
with open("users.txt","r") as user_file:
for aline in user_file.readlines():
vals = aline.split()
if (vals[0] == username) and (vals[1] == user_password):#goes through the text file looking for the valid username and password
loop2 = False
while loop2 == False:
sleep(3.0) #delays the time for menu to appear
print("\n"*300,"="*30,"\n\n\nWELCOME TO HAYDON BANK, {} \n\n\n".format(username),"="*30,"\n WHICH SERVICE DO YOU REQUIRE?\n","="*30,"\n\n\n Option 1: View Balance\n\n Option 2: Withdrawal\n\n Option 3: Change PIN\n\n\n","="*30,"\n")#this is the menu
balance = vals[2] #sets respective part of the file as the balance variable
print("\n"*6)
option = input("INPUT OPTION PRESS 'Q' TO QUIT>>> ")
if option == '1':
print("£",balance)
sleep(2.0)
elif option == '2':
withdrawal = input("SELECT AMOUNT TO WITHDRAW:\n £10\n £20\n £50\n £100\n OR INPUT AN AMOUNT THAT IS DIVISIBLE BY 10\n\n\nINPUT AMOUNT>>> £")
if withdrawal%10 == 0:
print("You selected:£",withdrawal)
newbalance = float(balance) - float(withdrawal)#sets the newbalance variable
valrep(2,str(newbalance))
print("New Balance:£",newbalance)
sleep(2.0)
elif option == '3':
loop3 = True
while loop3 == True:
old_pass, new_pass = input("input old PIN and new PIN: ").split(" ")
if len(new_pass) != 4: #checks if new_pass is 4 characters long
print("INCORRECT LENGTH")
elif False in [c in valnums for c in new_pass]: #loops through valnums and compares the variable new_pass to have valid characters
print("INVALID CHARACTERS")
elif old_pass == user_password: #checks if old_pass is equal to user_password
valrep(1,new_pass)
print("New PIN: ",new_pass)
loop3 = False
sleep(2.0)
elif option.lower() == 'q':
loop2 = True
print("Bye", username)
sleep(5.0)
else:
print("INVALID INPUT")
else:
print("INVALID INPUT")
break
users.txt文件：
user0001 1234 123.45
user0002 1234 123.45
user0003 1234 123.45
...
user9999 1234 123.45
问题是当我输入更接近用户名或user_password变量的文本文件中第9999行的值时，它会给我输出：
"INVALID INPUT"
"INVALID INPUT"
"INVALID INPUT"
...
直到代码在文本文件中找到值。
但我希望输出如下：
ENTER A VALID USERNAME>>> user9999
ENTER A VALID 4 DIGIT PIN>>> 1234
==============================
WELCOME TO HAYDON BANK, user0001
==============================
WHICH SERVICE DO YOU REQUIRE?
==============================
Option 1: View Balance
Option 2: Withdrawal
Option 3: Change PIN
==============================
INPUT OPTION PRESS 'Q' TO QUIT>>>
我该怎么做？
注意：我不是真正的程序员，我只是一个知道python编码基本知识的孩子，没有其他类型的编码
答案 0 :(得分：0)
您的期望与您编码的内容不一致。
for aline in user_file.readlines():
vals = aline.split()
if (vals[0] == username) and (vals[1] == user_password):
#...
else:
print("INVALID INPUT")
break
由于您从第一行匹配，因此在找到给定用户名=＆＃34; user9999＆＃34;的匹配项之前将发生不匹配。每次发生不匹配时，输入无效＆＃34;将打印。
解决此问题的一种快速方法是使用＆＃34; for ... else ...＆＃34;。请参阅a reference of for ... else ..（break需要else让for aline in user_file.readlines():
vals = aline.split()
if (vals[0] == username) and (vals[1] == user_password):
#Process...
break #let the "else" in next line knowing "we have found"
else:
print("INVALID INPUT")
break
知道我们搜索的内容。）
else在上面的代码中，只执行from time import sleep
def valrep(x,change): #function goes through a file and replaces specific values
with open('users.txt', 'r') as file :
filedata = file.read()
for aline in open("users.txt","r").readlines():
word = aline.split()
if (word[0] == username) and (word[1] == user_password):
aline2 = aline.replace(word[x], change)
filedata = filedata.replace(aline,aline2)
with open('users.txt', 'w') as file:
file.write(filedata)
print("SUCCESS")
loop = False
while loop == False:
username = input("ENTER A VALID USERNAME>>> ")#splits the input into two seperate variables
user_password = input("ENTER A VALID 4 DIGIT PIN>>> ")
valnums = '1234567890' #gives a set of valid characters (used later in the program)
with open("users.txt","r") as user_file:
for aline in user_file.readlines():
vals = aline.split()
if (vals[0] == username) and (vals[1] == user_password):#goes through the text file looking for the valid username and password
loop2 = False
while loop2 == False:
sleep(3.0) #delays the time for menu to appear
print("\n"*3,"="*30,"\n\n\nWELCOME TO HAYDON BANK, {} \n\n\n".format(username),"="*30,"\n WHICH SERVICE DO YOU REQUIRE?\n","="*30,"\n\n\n Option 1: View Balance\n\n Option 2: Withdrawal\n\n Option 3: Change PIN\n\n\n","="*30,"\n")#this is the menu
balance = vals[2] #sets respective part of the file as the balance variable
print("\n"*6)
option = input("INPUT OPTION PRESS 'Q' TO QUIT>>> ")
if option == '1':
print("£",balance)
sleep(2.0)
elif option == '2':
withdrawal = input("SElECT AMOUNT TO WITHDRAW:\n £10\n £20\n £50\n £100\n OR INPUT AN AMOUNT THAT IS DIVISIBLE BY 10\n\n\nINPUT AMOUNT>>> £")
if withdrawal%10 == 0:
print("You selected:£",withdrawal)
newbalance = float(balance) - float(withdrawal)#sets the newbalance variable
valrep(2,str(newbalance))
print("New Balance:£",newbalance)
sleep(2.0)
elif option == '3':
loop3 = True
while loop3 == True:
old_pass, new_pass = input("input old PIN and new PIN: ").split(" ")
if len(new_pass) != 4: #checks if new_pass is 4 characters long
print("INCORRECT LENGTH")
elif False in [c in valnums for c in new_pass]: #loops through valnums and compares the variable new_pass to have valid characters
print("INVALID CHARACTERS")
elif old_pass == user_password: #checks if old_pass is equal to user_password
valrep(1,new_pass)
print("New PIN: ",new_pass)
loop3 = False
sleep(2.0)
elif option.lower() == 'q':
loop2 = True
print("Bye", username)
sleep(5.0)
else:
print("INVALID INPUT")
break # this break is needed to let the "else" in next line knowing "we have found what we want"
else:
print("INVALID INPUT!!")
continue #comment this if you allow multi-user or re-login
语句，找不到匹配项。希望这是你想要的。
根据您发布的内容更改了可运行代码。
public static List<String> getImageIds(int size) {
Call<PhotosList> call = flickrService.getPhotos(apiKey, format, "1");
photoIds = new ArrayList<String>();
PhotosList photosList = call.execute().body();
List<Photo> photos = photosList.getPhotos().getPhoto();
for(Photo photo : photos) {
Log.d("TEMP_TAG", "adding photo id to list: " + photo.getId());
photoIds.add(photo.getId());
}
Log.d("TEMP_TAG", "it's getting here too");
return photoIds;
}