How to find the lines that correspond to my word in my text file?

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Python

Python3.6

I have two questions that I need answered. The first one is when I run my code it looks for the first instance of the word that I'm searching for and prints it out, but the line it prints out is one line short of where its suppose to be. So if I looked for the word "life', for example, it would print out the line "number 9" when actually the word is on line 10.

The second problem that I want to figure out is how to find multiple lines that have the word "life" inside my text file. I didn't know if I could use the enumerate module in order to look for multiple lines that have the word "life" and print those lines out. This is what I have so far.

Here's my code:

word = input("Enter the word to search for: ")

line_number = 0
text = open('current_line.txt', 'r') 
for number, line in enumerate(text):
  if word in line:
    line_number = number
    break

text.close()

print(line_number)

What I have tried:

I tried looking online for any resources that help with looking for multiple lines but none of those results were things that I was trying to do.