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Immutable vs Mutable types
...st, but not exactly. Technically, all variables are passed by reference in Python, but have a semantics more like pass by value in C. A counterexample to your analogy is if you do def f(my_list): my_list = [1, 2, 3]. With pass-by-reference in C, the value of the argument could change by calling that...
List comprehension rebinds names even after scope of comprehension. Is this right?
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List comprehensions leak the loop control variable in Python 2 but not in Python 3. Here's Guido van Rossum (creator of Python) explaining the history behind this:
We also made another change in Python
3, to improve equivalence between list
comprehensions and generator
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Behaviour of increment and decrement operators in Python
...optimize their code is usually frowned upon, especially in a language like Python that is designed to be consistent and readable.
Confusing side-effects. One common newbie error in languages with ++ operators is mixing up the differences (both in precedence and in return value) between the pre- and ...
How can I check the syntax of Python script without executing it?
...hen exit without executing it. Is there an equivalent way to do this for a Python script?
8 Answers
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Import Error: No module named numpy
... to this question , but still one step behind. I have only one version of Python 3 installed on my Windows 7 ( sorry ) 64-bit system.
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Any gotchas using unicode_literals in Python 2.6?
We've already gotten our code base running under Python 2.6. In order to prepare for Python 3.0, we've started adding:
6 A...
How to convert a string to utf-8 in Python
I have a browser which sends utf-8 characters to my Python server, but when I retrieve it from the query string, the encoding that Python returns is ASCII. How can I convert the plain string to utf-8?
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Python strftime - date without leading 0?
When using Python strftime , is there a way to remove the first 0 of the date if it's before the 10th, ie. so 01 is 1 ? Can't find a % thingy for that?
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How to JSON serialize sets?
I have a Python set that contains objects with __hash__ and __eq__ methods in order to make certain no duplicates are included in the collection.
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Java: Equivalent of Python's range(int, int)?
Does Java have an equivalent to Python's range(int, int) method?
13 Answers
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