File handling 12: file word search

# Search if a word exists in a file.

fs = open("ipt.txt", "r")
search_str = input("Enter string to search : ").strip()
Flag = False

while(True):
Line = fs.readline().strip()

if not Line:
break

if (search_str in Line):
Flag = True
break

if(Flag==True):
print(search_str, "present in file")
else:
print(search_str, "not present in file")

fs.close()