擅长:python、mysql、java
<p>可以使用<code>all()</code>确保所有行都通过了条件。例如:</p>
<pre><code>def char_finder(filename, char): # lets make it a bit more universal
with open(filename, "r") as f:
return all(char in line for line in f)
print(char_finder("inputfile.txt", "?"))
</code></pre>