摘要：ref: Pandas新增一列并按条件赋值？ 把下图中的 NaN 都赋值为 0 df.loc[条件判断, 'value'] = 0 m = pd.merge(gdf_africa, df_af_mp, how='left', on='country') m.loc[m['value'].isna() 阅读全文

摘要：Suppose we have a dataframe, it has a column of "country". It lists different names of country's names, and for one country maybe it has multiple reco 阅读全文

摘要：Ref: country-converter 1.0.0 Ref: Python-pycountry | Understand How to Use pycountry These two python libraries are both used to process information a 阅读全文

摘要：参考：How to Replace Elements in NumPy Array (3 Examples) You can use the following methods to replace elements in a NumPy array: Method 1: Replace Eleme 阅读全文

摘要：参考：Add Months to datetime Object in Python ☀☀☀<< 举例 >>☀☀☀ # import packages import pandas as pd # adding months to a particular date present = '2022-0 阅读全文

摘要：Ref: From WKT format Firstly, we already have a dataframe, and there is a column of geometry. But this column is in the format of the string, therefor 阅读全文

摘要：参考：自定义颜色条教程 import matplotlib as mpl cmap = mpl.colors.ListedColormap(['yellow', '#E0E0E0']) africa_gdf.plot(column='hotspot_category', cmap=cmap, leg 阅读全文

摘要：Reference: Python for Data Analysis, 3E - Pandas pandas.DataFrame.merge 29-April-2024 use to_string() to print the entire DataFrame. Check the number 阅读全文

摘要：参考：geopandas--坐标系学习 gdf.crs = 'EPSG:4326' 阅读全文

摘要：参考：Converting list of polygons to multipolygon using shapely? MultiPolygon -> Polygon list list(multiPoly.geoms) Polygon list -> MultiPolygon shapely. 阅读全文

摘要：参考：pandas 筛选某个值在某个列表中 isin #筛选某个值在某个列表中 df = df[df['subject_1'].isin([1, 2, 13, 18, 25])] 阅读全文

摘要：参考：Formula to Find Bearing or Heading angle between two points: Latitude Longitude 计算三角函数的时候，需要将经纬度的度数转换为弧度制，最后再将计算出来的弧度制转换为角度 def bearing_lonlat(phi_ 阅读全文