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Side effects of changing a list

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Marc Poulin
2018-09-14 11:20:53 -06:00
parent dc078e1a66
commit 1d1ebf540d
1 changed files with 4 additions and 4 deletions
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docs/writing/style.rst
+4 -4
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@@ -610,7 +610,7 @@ The approach you use depends on
* Python 2.x vs. 3.x
* Lists vs. iterators
* Creating a new list vs. modifying the original list
* Possible side effects of modifying the original list
Python 2.x vs. 3.x
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@@ -644,7 +644,7 @@ Creating a new list requires more work and uses more memory. If you a just going
# Or (2.x)
filtered_values = filter(lambda i: i != x, sequence)
# generators are lazy
# generators don't create another list
filtered_values = (value for value in sequence if value != x)
# Or (3.x)
filtered_values = filter(lambda i: i != x, sequence)
@@ -653,8 +653,8 @@ Creating a new list requires more work and uses more memory. If you a just going
Creating a new list vs. modifying the original list
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Possible side effects of modifying the original list
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Modifying the original list can be risky if there are other variables referencing it. But you can use *slice assignment* if you really want to do that.