Python while循環迭代不起作用

Question

我是Python編程中的一名新成員，幾個小時後一直無法解決以下問題。我有包含四行的示例文件。我希望在文件行中找到來自用戶的兩個輸入，但是我的循環似乎無法遍歷所有行。這是文件的內容，元素由空格分隔：

Google 1 2 
Apple 13 17 
Microsoft 22 8 
Verizon 6 15 

而這一次是我的代碼：

import sys 
with open('manylines.txt','r') as myfile: 
    results = [line.split() for line in myfile] 

    for i in results: 
     print(i) 


     term1=input("Enter the first term:") 
     while term1 not in i : 
      print("Term not found,please try again:") 
      term1 = input("Enter the first term:") 

     term2 = input("Enter the second term:") 
     while term2 not in (i) : 
      print("Term not found,please try again:") 
      term2 = input("Enter the second term:") 
     print(i) 
     print(i) 
     sys.exit() 

我想例如谷歌和微軟輸入，並得到下面的輸出：

['Google','1','2'] 
['Microsoft','22','8'] 

兩個列表。但是，我的代碼只找到第一行，而不是其他的。你能告訴我爲什麼它不會迭代其他線路，請。如何解決這個問題？提前致謝！

Answer 1

下面是一些不將代碼從你的企圖徹底改變......它利用lower()和title()允許各種資本的用戶輸入：

import sys 

with open('data.txt','r') as f: 
    results = [line.split() for line in f] 

while True: 
    found = False 
    term = input("Enter a company to search or type exit: ") 
    if term.lower() == "exit": 
     break 
    for record in results: 
     if record[0] == term.title(): 
      print(record) 
      found = True 
      break 
    if not found: 
     print("Term not found, please try again...") 

print("Goodbye!") 
sys.exit(0) 

實例應用：

Enter a company to search or type exit: Google 
['Google', '1', '2'] 
Enter a company to search or type exit: microsoft 
['Microsoft', '22', '8'] 
Enter a company to search or type exit: Amazon 
Term not found, please try again... 
Enter a company to search or type exit: Exit 
Goodbye! 

這裏是你如何只能提示用戶只對「兩個詞」：

out1, out2 = [], [] 
term_count = 1 
while term_count < 3: 
    found = False 
    term = input("Enter term %d or type exit: " % term_count) 
    if term.lower() == "exit": 
     break 
    for record in results: 
     if term_count == 1 and record[0] == term.title(): 
      print(record) 
      out1 = list(record) 
      found = True 
      term_count += 1 
      break 
     if term_count == 2 and record[0] == term.title(): 
      print(record) 
      out2 = list(record) 
      found = True 
      term_count += 1 
      break 
    if not found: 
     print("Term not found, please try again...") 

實例應用：

Enter term 1 or type exit: Amazon 
Term not found, please try again... 
Enter term 1 or type exit: Google 
['Google', '1', '2'] 
Enter term 2 or type exit: Microsoft 
['Microsoft', '22', '8'] 
Goodbye! 

Answer 2

嘗試

下面的代碼。此代碼標識找到哪個術語，並詢問找不到的術語。

您沒有正確製作循環。當您的循環首次執行時，它具有Google，term1包含Google，term2包含Microsoft。因此它會打印Google，之後您使用sys.exit（）彎腰執行。所以當然它不打印其他的第一行。

import sys 
with open('tempa.txt','r') as myfile: 
    results = [line.split() for line in myfile] 

NeedToExecute = 0 
term1 = False 
term2 = False 

list1 = None 
list2 = None 

while NeedToExecute != 2: 

    if(term1 != True): 
     term1 = input("Enter the first term:") 

    if(term2 != True): 
     term2 = input("Enter the second term:") 

    for i in results: 

     if term1 in i : 
      NeedToExecute = NeedToExecute + 1 
      term1 = True 
      list1 = i 
      print(i) 

     if term2 in i : 
      NeedToExecute = NeedToExecute + 1 
      term2 = True 
      list2 = i 
      print(i) 

print list1 
print list2