How to find the index of value in python list?

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In Python, how can I find the index of the first item in a list that is NOT some value?

Python's list type has an index(x) method. It takes a single parameter x, and returns the (integer) index of the first item in the list that has the value x. Basically, I need to invert the index(x) method. I need to get the index of the first value in a list that does NOT have the value x. I would probably be able to even just use a function that returns the index of the first item with a value != None. I can think of a 'for' loop implementation with an incrementing counter variable, but I feel...

Answer:

Exiting at the first match is really easy: instead of computing a full list comprehension (then tossing...

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Ryan B. Lynch at Stack Overflow Mark as irrelevant Undo

Other solutions

How do i find duplicates in a list in Python?

I need to create a function that find duplicates in a list in python. I want it to return a boolian for True or False and i cant use the set function. It has to use while loops and counters. In the end it will looks something like this except hopefully...

Answer:

haystack = [1,5,6,3] needle = 6 if needle in haystack: print 'needle found' http://www.php2python.com...

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Jhon adams at Yahoo! Answers Mark as irrelevant Undo

Need help; circular link list

QUESTION: Can you help me with this code.. this is actually a single link list..I want to change it to be circular link list.. I have a function which is InsertNode , findNode & deleteNode. The InsertNode is use for inserting a new node after the...

Answer:

Hello. You have the right idea now. You did a good job, but there are some problems. When index =...

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Miningco.com Mark as irrelevant Undo

Parse an Internet Explorer Bookmark file in Python or Java

I'm quite embarrassed to ask for help on this as I've already banged my head against the wall trying to figure this one out for 8 hours over this weekend and I think this should be easily solvable! My question is: How do I parse an IE saved bookmark...

Answer:

Hi coolguy90210, In a Netscape-format bookmark file exported from Internet Explorer, each folder is...

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coolguy90210-ga at Google Answers Mark as irrelevant Undo

Python Programming question - strings and indexing?

How do I index a list of an unknown length starting at a certain point, lets say the 5th character (index 4) and splice the list starting from that index to the final character in the list? example question: Write an expression whose value is the str...

Answer:

say, you want to get the substring from a'th to b'th s[a:b] or if you want from the beginning to b'th...

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Considering large inputs, where could the possible bottleneck for this Python code be?

The following Python code is counting the frequency of given integers and prints the integer which has the highest frequency. Working for small input takes where n < 1000, while TLE for n > 10000 #No of testcases t=int(raw_input().strip())...

Answer:

I'd change you code slightly to this: #!usr/bin/python t = int(raw_input().strip()) for i in range...

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Anonymous at Quora Mark as irrelevant Undo

How to draw a histogram in python?

For my programming class I have to write a program where I have to draw a picture histogram. Here is the problem I have to solve.... In the histograms on the right, the x axis (going rightward) represents increasing brightness from 0 to 255. The height...

Answer:

I don't know the library you're using for display and you didn't include any import statements or def...

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babybug0... at Yahoo! Answers Mark as irrelevant Undo

Why does Python change the order of tuple elements returned in calls to items() and keys() on a dict?

Hi guys. I am currently learning Python, and I have found a weird problem with lists and dictionaries, maybe you can help me nail it down: Code below: ------------------------------------------------------------------------------------- women = {"...

Answer:

Yoyo's answer is correct. This talk will explain in more detail what's going on under the hood: http...

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Vaibhav Mallya at Quora Mark as irrelevant Undo

I've been working for a year to gather all this information.Do you find it useful?

Special thanks to my American friend who helped me proofread my writing.It's taken me almost a year to find some pieces of this information. I believe that if you spend 5-10 minutes reading this essay, you will be better informed than if you listen to...

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Thank you for laying it all out for your foreign friends!! I think Iran's pretty cool... This country...

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How do I find mean and median using hadoop streaming?

Ok, I know this is not the right place to put this question but I have asked this question in hadoop mailing list as well as posted it over here: Finding mean median using python hadoop streaming I have data like: id,value 1,2.0 1,3.0 1,5.0 2,3.2 and...

Answer:

Mean Have the mapper emit 1 for the key and the pair {1, x} for the value where x is the value input...

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Raphael Cendrillon at Quora Mark as irrelevant Undo

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