合并两个数据框并返回整数值（如年份）的函数

Question

返回一个合并的DataFrame，其中包含国家/地区名称，区域和CO2排放量， 给定年份。

"ConversationStateTime": "XXXXXXXXX"

Parameters
----------
year : int
    The year of interest

Returns
-------
a DataFrame
   A pandas DataFrame with three columns titled 
   'Country', 'Region', and 'CO2 emissions'. 

def mergeByYear(year):
    yearString = str(year)
    result = pd.merge(country1, emission, on = 'Country Name')
    return 

Answer 1

假设您问题中的代码有效，则只需调整返回的内容即可：

def mergeByYear(year):
    yearString = str(year)
    result = pd.merge(country1, emission, on = 'Country Name')
    return result.loc[result['year'] == year]