您应该尝试这样的事情：
import redef check_string(): #no need to pass arguments to function if you're not using them w = raw_input("Input the English word: ") #open the file using `with` context manager, it'll automatically close the file for you with open("example.txt") as f: found = False for line in f: #iterate over the file one line at a time(memory efficient) if re.search("b{0}b".format(w),line): #if string found is in current line then print it print line found = True if not found: print('The translation cannot be found!')check_string() #now call the function如果您要搜索确切的单词而不只是子字符串，那么我建议
regex在这里使用。
例：
>>> import re>>> strs = "foo bar spamm">>> "spam" in strs True>>> bool(re.search("b{0}b".format("spam"),strs))False
