回答編集履歴
2
追記
test
CHANGED
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@@ -25,6 +25,76 @@
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25
25
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```
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26
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[[2, 0], [2, 1], [1, 0]]
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```
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30
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33
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元のコードがうまくいかない理由
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34
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---
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実際に試してみると面白いです。
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38
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39
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```Python
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40
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41
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#
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42
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43
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lst = [1, 2, 3, 4, 5]
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for elem in lst:
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print(elem)
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48
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lst.remove(elem)
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print(lst)
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#
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lst = [1, 2, 3, 4, 5]
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60
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61
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for elem in lst[:]:
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print(elem)
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64
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65
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lst.remove(elem)
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66
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68
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print(lst)
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70
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71
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```
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72
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73
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74
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75
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**実行結果** [Wandbox](https://wandbox.org/permlink/Rw7rLGXYejjcPqEb)
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76
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77
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```
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78
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79
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1
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80
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81
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3
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82
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83
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5
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84
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85
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[2, 4]
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86
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87
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1
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89
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2
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90
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91
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3
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92
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93
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4
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94
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95
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5
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96
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97
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[]
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28
98
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29
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```
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30
100
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1
追記
test
CHANGED
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@@ -27,3 +27,37 @@
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27
27
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[[2, 0], [2, 1], [1, 0]]
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28
28
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29
29
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```
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30
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ただし
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35
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---
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36
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37
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今回は『排除する条件』より『排除しない条件』の方が書きやすそうです。
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ついでにリスト内包表記も利用してみます。
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```Python
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42
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ls = [[2, 0], [2, -1], [4, 0], [2, 1], [1, 0]]
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ls = [
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row for row in ls
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if 0 <= row[0] < 3
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if 0 <= row[1] < 5
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]
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54
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print(ls)
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```
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60
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63
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[Wandbox](https://wandbox.org/permlink/DBs3g2YODGUYADRp)
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