python - how can i search a text file of list of words from user input and print the line which contains these words? -

my query here want search words text file , print lines contain words. words given user input. somehow reached till point it's giving output nothing.

def sip(x):      print("====welcome sip log debugger ==== ")     file= input("please enter log file path: ")     search = input("enter errors want search for(seperated commas):   ")     search = [word.strip() word in search.lower().split(",")]     open(file,'r') f:         lines = f.readlines()         line = f.readline()         word in line.lower().split():             if word in line:                 print(line),                 if word == none:                     print('') 

you're reading lines , saving them variable:

lines = f.readlines() 

then try read 1 more line:

line = f.readline() 

but you've read through whole file, there's nothing read anymore, f.readline() returns ''. next try loop through each word in line variable, ''.

instead of this, should loop through lines using for line in f:, like:

with open(file, 'r') f:     line in f:         line = line.lower()         word in search:             if word in line:                 print(line) 

i'm not sure you're trying if word == none:, word can never none since line string , word part of string (you used line.split()).