擅长:python、mysql、java
<p>这应该起作用:</p>
<pre><code>for file in df1.loc[:, '#filename']:
new = str(file)
if new[0] != 'B':
final = new[:0] + 'B' + new[0:]
else:
final = new
print((final))
df1.replace(new, final,inplace=True)# yuo are not using inplace=True, this is required as otherwise this will return the old dataframe after replacement
print(df1['#filename'])
df1.to_csv('updated_name_data.csv')
</code></pre>