拆分Python函数无法正常工作

Question

If I have a file (users.txt) with the following information formatted:

x y z(t)

x y z(t)

How can I write a python function that reads in the file (users.txt) and uses the split function to break up each line of the file into three variables:

who for x
where for y
when_and_time for z(t)

and print s to the screen such that the format is who on where at when_and_time or with the variables x on y at z(t)

What I have so far is:

user_info = open("~/users.txt").read()
for line in user_info:
    positions = line.split(',')
    who = positions[0]
    where = positions[1]
    when_and_time = positions[2]
    print(who + " on " + where + " at " + when_and_time)   # I press enter at this point

It gives me the prompt for more commands, at which point I press enter again and receive the following:

Traceback (most recent call last):
  File "<stdin>", line 4, in <module>
IndexError: list index out of range

What am I doing wrong??

Answer 1

The issue here is that you're doing split(",") , which will split the string on comma characters. Since you appear to have formatted your string with spaces, it's not splitting it anywhere, so you only get one element in your list. You probably want to use split() with no argument to split on any whitespace.

Answer 2

if you read file line by line will be better then you can split on spaces:

f=open('your_file')
for x in f:
    x=x.split()  # now here x contain all variables that are separated by space
    # do your stuff with x