擅长:python、mysql、java
<p>{{cd2>的值不是^ cd2>的默认值。因此,您可以按照Dominique Paul的建议使用<code>axis=1</code>调用函数,也可以使用<code>join</code>来代替。下面是一个例子:</p>
<pre><code># data to create the dataframes with
data_1 = [1,2,3,4,5]
index_1 = ['a','b','c','d','e']
data_2 = [6,7,8,9,10]
index_2 = ['b','d','e','a','c']
# create dataframes
df_1 = pd.DataFrame({'data_1':data_1, 'new_index':index_1})
df_2 = pd.DataFrame({'data_2':data_2, 'new_index':index_2})
# setting new index to test unaligned indexes
df_1.set_index('new_index', inplace=True, drop=True)
df_2.set_index('new_index', inplace=True, drop=True)
# join operation is performed on indexes
df_1.join(df_2)
</code></pre>