用户输入搜索后将txt文件转换为列表并返回行

Question

I'm trying to have the user input a telephone number, then the program will open a text file, convert it to a list, search the list and if the phone number is found it will return the rest of the line (which contains the address for that phone number.

I can only get it to return either "phone number not found" or the line but it does it for every single line so I end up with an output like this:

phone number not found
phone number not found
0121 254132 18 Springfield Road
phone number not found
phone number not found

---

for line in phonenumbers:

    if number in line:
        print (line)
    else:
        print ("phone number not found")

I know it's because I've put for line in phonenumbers but don't know how to not do it for every line.

Answer 1

try the following:

for line in phonenumbers:    
    if number in line:
        print (line)
        break
else:
    print ("phone number not found")

the else is part of the for loop and will only execute if you didn't break out of the for loop.

Answer 2

Why do you not just drop the else statement. It should look something like:

for line in phoneNumbers:
  if phone in line:
     print line

If you want a result in case that it was not found you could use a flag. moreover you can just use:

print [line for line in phonenumbers if number in line]