回答編集履歴
2
修正
test
CHANGED
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@@ -55,37 +55,3 @@
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#86.0
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```
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ちなみに、関数を自作しない場合はこういう書き方でもできます。
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```python3
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import numpy as np
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import pandas as pd
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df = pd.DataFrame(
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[
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['Alice', '国語', 87, 83],
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['Alice', '算数', 72, np.nan],
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['Bob', '国語', 65, np.nan],
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['Bob', '算数', 92, 86],
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],
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columns=['Name', 'Subject', 'Point', 'Last'])
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df["Last"][df["Last"].isnull()]=df["Point"][df["Last"].isnull()]
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```
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1
追記
test
CHANGED
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@@ -55,3 +55,37 @@
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55
55
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#86.0
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56
56
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57
57
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```
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58
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+
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59
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+
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60
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+
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61
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+
ちなみに、関数を自作しない場合はこういう書き方でもできます。
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62
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+
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63
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+
```python3
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64
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+
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65
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+
import numpy as np
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66
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+
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67
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import pandas as pd
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68
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69
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70
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71
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df = pd.DataFrame(
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72
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73
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[
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74
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75
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['Alice', '国語', 87, 83],
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76
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77
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['Alice', '算数', 72, np.nan],
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78
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79
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['Bob', '国語', 65, np.nan],
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80
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81
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['Bob', '算数', 92, 86],
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82
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83
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],
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84
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columns=['Name', 'Subject', 'Point', 'Last'])
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86
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87
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89
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df["Last"][df["Last"].isnull()]=df["Point"][df["Last"].isnull()]
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90
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91
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```
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