擅长:python、mysql、java
<p>如果要在<code>if</code>语句中添加第二个条件,则需要设置整个条件</p>
<pre class="lang-py prettyprint-override"><code>list_ = ["a", "b", "c", "d"]
for elem in list_:
if elem != "a" and "b":
print(elem)
# Output : b, c, d
for elem in list_:
if elem != "a" and elem != "b":
print(elem)
# Output : c, d
</code></pre>
<p>这意味着:</p>
<pre class="lang-py prettyprint-override"><code>for col in data.columns:
if col != 'date' and col != 'unix' :
print(col)
</code></pre>