擅长:python、mysql、java
<p><strong>关于你的第一点:</strong></p>
<pre><code>n_columns_with_session = 3
# create the names of the target columns
cols = ["Session{}".format(i) for i in range(1,n_columns_with_session+1)]
# change the dtype of the target columns
df1[cols] = df1[cols].astype('int64')
</code></pre>
<hr/>
<p><strong>第二点:</strong></p>
<pre><code># create the new names
new_names_cols = ["Sess{}".format(i) for i in range(1,n_columns_with_session+1)]
# append "Total" name since you do not want to change this
new_names_cols.append('Total')
# rename the columns
df1.columns = new_names_cols
</code></pre>