pandas python pandas打印数据框的元素
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python pandas print element of dataframe
提问by Barry Andersen
I have a pandas data frame named country_codes:
我有一个名为 country_codes 的 Pandas 数据框：
>>> country_codes.head(3)
COUNTRY FIPS ISO2 ISO3
0 Afghanistan AF AF AFG
1 Albania AL AL ALB
2 Algeria AG DZ DZA
given a particular fips code:
给定一个特定的 fips 代码：
>>> fips = 'RS'
I select the country name corresponding to that fips code:
我选择与该 fips 代码对应的国家/地区名称：
>>> country = country_codes[country_codes['FIPS']==fips]['COUNTRY']
and print it:
并打印它：
>>> print(country)
201 Russia
Name: COUNTRY, dtype: object
I want to use that country name in the title of a matplotlib plot. I want the country name only. I do not want the index number or the line that says Name: COUNTRY, dtype: object. How do I get the name only?
我想在 matplotlib 绘图的标题中使用该国家/地区名称。我只想要国名。我不想要索引号或显示 Name: COUNTRY, dtype: object 的行。我怎么只得到名字？
回答by Weston
You're getting a series from indexing the dataframe
>>> country = country_codes[country_codes['FIPS']==fips]['COUNTRY']
>>> type(country)
<class 'pandas.core.series.Series'>
For a Series, selection by position:
对于系列，按位置选择：
>>> country.iloc[0]
'Russia'
回答by HYRY
I think create a series with FIPS as the key and COUNTRY as the value will make the code simpler:
我认为创建一个以 FIPS 为键和 COUNTRY 为值的系列将使代码更简单：
fips = pd.Series(df["COUNTRY"].values, index=df["FIPS"])
then you can get the country by:
那么你可以通过以下方式获得国家：
fips["AL"]
