I have a names and numbers in my file (name of the file 'phone\_book') and I tried to read all data using this code: 

```
def read_phonebook():
    read = open("phone_book.txt", 'r')
    i = 0
    for i in (len(read)):
        print(i + '\t')

    read.close()

while True:
if menu == 2:
    read_phonebook()

```

but it gives Error: read\_phonebook file has no len()

If I don't use len it keeps printing data because I'm using While loop.
Could someone explain me how can I make this function to read list's whole data? with using While Loop?