如何使用python内置的函数读取文本文件以查找值

Question

I have a function that reads in a list. it will iterate through the list and use that as the function input. It reads a text file that only contains 2 lines.

LC1
LC2

import re

def dict(input):
    for line in file:
        if re.search(input,line):
            print(input)
            d[input]=None
        else:
            print(d)
            break




file = open("Text.txt",'r')
d={}
kw=['LC1','LC2']
for input in kw:
    dict(input)

When it inputs LC2 the function break right away and I'm not sure why.The end goal is to have a dictionary that looks like this

d={LC1:None,LC2:None}

Answer 1

Simple way to do it:

def todict(vals,file):
    d={}
    for line in file:
        if line.rstrip() in vals:
            d[line.rstrip()]=None

    return d

file = open("Text.txt",'r')
print(todict(['LC1','LC2'],file))

But still the easiest way is:

def todict(vals,file):
    return {}.fromkeys([i.rstrip() for i in file if i.rstrip() in vals])

file = open("Text.txt",'r')
print(todict(['LC1','LC2'],file))

Both reproduce:

{'LC1': None, 'LC2': None}