擅长:python、mysql、java
<p>您可以将<a href="https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.Series.fillna.html" rel="nofollow noreferrer">^{<cd1>}</a>与指定映射的字典一起使用,以便在货币代码有用时:</p>
<pre><code>cmap = {'GBP': 'GBR', 'EUR': 'IRE'}
df['CountryISOCode'] = df['CountryISOCode'].fillna(df['CurrencyCode'].map(cmap))
print(df)
Name PostCode CurrencyCode CountryISOCode
0 Steve Invalid Postcode GBP GBR
1 Robyn Invalid Postcode EUR IRE
2 James Valid Postcode GBP GBR
3 Halo Invalid Postcode EUR IRE
4 Jesus Valid Postcode GBP GBR
</code></pre>