Recent questions tagged Python:

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python: deque vs list performance comparison

In python docs I can see that deque is a special collection highly optimized for poping/adding items from left or right ... 3: 243 us per loop See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python: How do I know what type of exception occurred?

I have a function called by the main program: try: someFunction() except: print "exception happened!" but in ... caused the exception to happen? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python: class attributes and instance attributes

I'm new to python and learned that class attributes are like static data members in C++. However, I got ... explain why the difference? Thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python: urllib2 how to send cookie with urlopen request

I am trying to use urllib2 to open url and to send specific cookie text to the server. E.g. I want to ... urlopen("http://chess-problems.prg") Thanks in advance Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python: Appending a dictionary to a list - I see a pointer like behavior

I tried the following in the python interpreter: >>> >>> a = [] >>> b = {1:'one'} >>> a.append(b) >>> ... in the list. How do I do it? Thank you for your time! Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python: SyntaxError: EOL while scanning string literal

I have the above-mentioned error in s1="some very long string............" Does anyone know what I am doing wrong? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python: Change the scripts working directory to the script's own directory

I run a python shell from crontab every minute: * * * * * /home/udi/foo/bar.py /home/udi/ ... elegant solution. Thanks for your answers and explanations! Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python: changes to my copy variable affect the original variable

This question already has answers here: Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python: convert "5,4,2,4,1,0" into [[5, 4], [2, 4], [1, 0]]

Is there a "straightforward" way to convert a str containing numbers into a list of [x,y] ints? # from: '5 ... /65833670/converting-a-list-of-strings-into-a-nested-list-of-integers...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python: my code doesn't loop into the for loop to read the csv

I am trying to create a code where two pre-existing users can login to an account, and it is authorized from a csv ... python-my-code-doesnt-loop-into-the-for-loop-to-read-the-csv...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python: NameError：global name '...‘ is not defined

(This question already has an answer here): question from:https://stackoverflow.com/questions/17557190/python-nameerror-global-name-is-not-defined...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python: rstrip one exact string, respecting order

Is it possible to use the python command rstrip so that it does only remove one exact string and does ... .com/questions/18723580/python-rstrip-one-exact-string-respecting-order...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python: rstrip one exact string, respecting order

Is it possible to use the python command rstrip so that it does only remove one exact string and does ... .com/questions/18723580/python-rstrip-one-exact-string-respecting-order...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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959 views

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python: create list of tuples from lists

(This question already has answers here): question from:https://stackoverflow.com/questions/7313157/python-create-list-of-tuples-from-lists...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

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python: scipy.interpolate.griddata causes script to end

I am trying to use scipy interpolate griddata to interpolate a regular grid of lat/lon data points. When I try ... grid_y), method='nearest') print('Interpolated') return grid_z...

asked Feb 19, 2021 in Technique[技术] by 深蓝 (71.8m points)

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924 views

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python: what does a method return if what it does is just raise error?

The following code snippet is from python cook book, 3rd Ed. Chapter 8.21: class NodeVisitor: def visit(self, node) ... , how come it returned something and assigned to "meth"?...

asked Feb 19, 2021 in Technique[技术] by 深蓝 (71.8m points)

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