擅长:python、mysql、java
<p>您可以使用<a href="https://spark.apache.org/docs/latest/api/python/pyspark.sql.html#pyspark.sql.Column.substr" rel="nofollow noreferrer">^{<cd1>}</a>方法:</p>
<pre><code>import pyspark.sql.functions as F
def left(x, n):
return x.substr(0, n)
def right(x, n):
x_len = F.length(x)
return x.substr(x_len - n, x_len)
</code></pre>