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What does -> mean in Python function definitions?
I've recently noticed something interesting when looking at Python 3.3 grammar specification :
7 Answers
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How to turn on line numbers in IDLE?
...wise there are a bunch of other IDEs some of which are free: https://wiki.python.org/moin/IntegratedDevelopmentEnvironments
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What are metaclasses in Python?
In Python, what are metaclasses and what do we use them for?
22 Answers
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Validating with an XML schema in Python
...e to validate that my XML file adheres to the schema. How do I do this in Python?
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Add params to given URL in Python
...:
try:
import urlparse
from urllib import urlencode
except: # For Python 3
import urllib.parse as urlparse
from urllib.parse import urlencode
url = "http://stackoverflow.com/search?q=question"
params = {'lang':'en','tag':'python'}
url_parts = list(urlparse.urlparse(url))
query = d...
Use 'import module' or 'from module import'?
...est to use import module or from module import . I've just started with Python and I'm trying to start off with best practices in mind.
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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?
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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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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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