Does anyone with w(write) permission also have the r(read) permission? rev2023.7.27.43548. You have a dictionary in a list. And then the value for key "password" from the dictionary. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. @Oleg I don't understand in the 'dict` method how the code understands that we want to look at the second element. "Who you don't know their name" vs "Whose name you don't know", The Journey of an Electromagnetic Wave Exiting a Router, The British equivalent of "X objects in a trenchcoat", Schopenhauer and the 'ability to make decisions' as a metric for free will. How do I keep a party together when they have conflicting goals? Unpacking "If they have a question for the lawyers, they've got to go outside and the grand jurors can ask questions." Making statements based on opinion; back them up with references or personal experience. How can I find the second occurrence of a string inside a list? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. @zdimension: There is sometimes a reason to not copy (even half of) the input. (with no additional restrictions). If I allow permissions to an application using UAC in Windows, can it hack my personal files or data? The question is actually unclear @FLAK-ZOSO -- in the body they say. Been wandering how to do this for multiple method returns - never thought I'd find the answer on this random question. Maybe a lambda function could do it better, but IMO it would be less clear. To learn more, see our tips on writing great answers. Getting a list when you want an element only postpones the inevitable "list index out of range" - and that's what should happen when attempting to get an element from an empty list. In any event, exceptions are objects that halt your code. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. @dee The code is correct, look at the error message, the type of the object in the code by bwc, and the type of the object youre trying to use the method on. Manga where the MC is kicked out of party and uses electric magic on his head to forget things. Share. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Please comment if you think I'm leaving a caveat out. Can you have ChatGPT 4 "explain" how it generated an answer? Connect and share knowledge within a single location that is structured and easy to search. List indexes are zero-based. How to find index of second occurrence of a phrase in a string in Python 3? Does anyone with w(write) permission also have the r(read) permission? Connect and share knowledge within a single location that is structured and easy to search. Below is an example of a Python function which gets the second smallest value in a list of numbers. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. How do I get the number of elements in a list (length of a list) in Python? [duplicate], Iterating over every two elements in a list [duplicate], Behind the scenes with the folks building OverflowAI (Ep. Schopenhauer and the 'ability to make decisions' as a metric for free will. Accessing the last element from the list in Python: 1: Access the last element with negative indexing -1, 2. Seems like you are storing a single string in a list and that seems unnecessary. if you are embarassed that results are tuples we can turn them into lists simply using map built-in: Lots of pure Python approaches here. Then it iterates through the list, checking to see if any values are lower than the lowest so far, or the second lowest so far. For example: Here a try with zip, zip() will makes iterator that aggregates elements based on the iterables passed, and returns an iterator of tuples, so map() function is used to make the tuples to list : One-liner using zip built-in and unpacking. The British equivalent of "X objects in a trenchcoat". Could the Lightning's overwing fuel tanks be safely jettisoned in flight? Eliminative materialism eliminates itself - a familiar idea? How does this compare to other highly-active people in recorded history? Get a copy of the list without last element and traverse this list using a looping statement. What is Mathematica's equivalent to Maple's collect with distributed option? How does this compare to other highly-active people in recorded history? How to iterate over rows in a DataFrame in Pandas. Those would be: 965, 988. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. I used this with pandas duplicated like this : duplicated = df.duplicated(subset=["Full Name"],keep=False) data_read5 = next(iter(duplicated[::-1])). Another approach is to use the mathematical concept of remainder and apply it to list indexes. From a readability perspective, I would probably combine iterable unpacking with list comprehension for something like -. Gold star for you, haha. Relative pronoun -- Which word is the antecedent? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. To avoid "IndexError: list index out of range", you can use this piece of code. Iterating over 2 elements in a list but repeating the second element in the next iteration. Why would a highly advanced society still engage in extensive agriculture? What is the least number of concerts needed to be scheduled in order that each musician may listen, as part of the audience, to every other musician? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. since you're writing Python, you really should try to be more Pythonic. How to get the second to last value in a list? Not the answer you're looking for? The Journey of an Electromagnetic Wave Exiting a Router. python get second value of a tuple in a list - Stack Overflow Can you have ChatGPT 4 "explain" how it generated an answer? If I allow permissions to an application using UAC in Windows, can it hack my personal files or data? "Sibi quisque nunc nominet eos quibus scit et vinum male credi et sermonem bene", Single Predicate Check Constraint Gives Constant Scan but Two Predicate Constraint does not, Unpacking "If they have a question for the lawyers, they've got to go outside and the grand jurors can ask questions." Instead, you want to add the zip into a list to extract the elements you want based on the index. Why is an arrow pointing through a glass of water only flipped vertically but not horizontally? from former US Fed. Are self-signed SSL certificates still allowed in 2023 for an intranet server running IIS? In the example below, we find the index of the first occurance and then find the index of the first occurance in the sub-list that begins just after the first occurance. Why is the expansion ratio of the nozzle of the 2nd stage larger than the expansion ratio of the nozzle of the 1st stage of a rocket? is there a limit of speed cops can go on a high speed pursuit? @MichaelWu There is no sense to do that. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. OverflowAI: Where Community & AI Come Together, Behind the scenes with the folks building OverflowAI (Ep. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. OverflowAI: Where Community & AI Come Together, How to extract the n-th elements from a list of tuples, Behind the scenes with the folks building OverflowAI (Ep. If your str() or list() objects might end up being empty as so: astr = '' or alist = [], then you might want to use alist[-1:] instead of alist[-1] for object "sameness". Can I use the door leading from Vatican museum to St. Peter's Basilica? So lets consider that we have a list a = [1,2,3,4], in Python List can be manipulated to give us part of it or a element of it, using the following command one can easily get the last element. If I allow permissions to an application using UAC in Windows, can it hack my personal files or data? Are arguments that Reason is circular themselves circular and/or self refuting? key function in the sort (), Copy to clipboard If I allow permissions to an application using UAC in Windows, can it hack my personal files or data? Sorry, I tried this before and it does not work. Can you have ChatGPT 4 "explain" how it generated an answer? You will just need to take the and put [-1] index. This probably should be the default behaviour, it's much easier to work with: You can use pd.DataFrame.iterrows() to iterate by row and then select the proper index for your list. Do the 2.5th and 97.5th percentile of the theoretical sampling distribution of a statistic always contain the true population parameter? It seems unusual, no? Can YouTube (e.g.) Asking for help, clarification, or responding to other answers. "Sibi quisque nunc nominet eos quibus scit et vinum male credi et sermonem bene". Method 1: Directly using a loop to search for specified indexes. you do intend to remove the last element from the list, treating it like a stack. Get every second element from a List of tuples in Python from former US Fed. send a video file once and multiple users stream it? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. If there is no such element then it raises a ValueError. 1. What does it mean in terms of energy if power is increasing with time? i have following list: parent_child_list with id-tuples: Example: i would like to print those values which are combined with the id 960. Indexes and slices can take negative integers as arguments. How to get the last occurrence of list as output? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. However, there are some things to keep in mind. Say, at least 5 initial number from input matches these value and output the result. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. What is the latent heat of melting for a everyday soda lime glass. 7 Answers Sorted by: 23 You can try list indexing: data = [ [6.0, 0.5], [6.1, 1.0], [6.2, 1.5], [6.3, 2.0], [6.4, 2.5], [6.5, 3.0], [6.6, 3.5], [6.7, 4.0], [6.8, 4.5]] d1 = [item [0] for item in data] print d1 d2 = [item [1] for item in data] print d2 output : By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. What does it mean in terms of energy if power is increasing with time? How to get index of the last item with a given value, How to get the last item of a list in python. Use index and length of list to traverse the list until the last element, but not executing the loop for the last element. Are modern compilers passing parameters in registers instead of on the stack? When called without an argument, it defaults to the last item in the list. This is a simple method where you can do the same operation on. True story - I find that in anything I use often enough (Python, vim), I tend to need reminders of neat/cool features that I've forgotten because I don't use them. "Pure Copyleft" Software Licenses? l = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] l2=map(None,*[iter(l)]*2) print(l2) gives map object instead of k,v pairs. How and why does electrometer measures the potential differences? use a list comprehension to iterate over the keys of the dictionary and extract the corresponding values. What is Mathematica's equivalent to Maple's collect with distributed option? How To Replace Items In A Python List - Python Guides and the new list to be empty if the prior list was empty. What is Mathematica's equivalent to Maple's collect with distributed option? The simplest way to display last element in python is. The value of 0.0 was originally a negative value (its a noisy data point) and so I used: I cannot remove the value entirely using a=a[a>0.0] as it is important that I keep all of the data points (these are y values that have corresponding x values). Not the answer you're looking for? A student of Python will also learn that lists are ordered, meaning that the order of their elements is fixed. Did active frontiersmen really eat 20,000 calories a day? Why do we allow discontinuous conduction mode (DCM)? @anon01 but to get the value you'd have to access the returned list and will give Index out of range. I don't understand how this answer to "how to get the last element?" Why do code answers tend to be given in Python when no language is specified in the prompt? Not the answer you're looking for? Does anyone with w(write) permission also have the r(read) permission? Connect and share knowledge within a single location that is structured and easy to search. How can Phones such as Oppo be vulnerable to Privilege escalation exploits. so that advantage doesnt matter. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Add a comment. To get every other element in a Python list you can use the slice operator and use the fact that this operator allows to provide a step argument (with its extended syntax). if result: return data[0]['password'] Connect and share knowledge within a single location that is structured and easy to search. Are arguments that Reason is circular themselves circular and/or self refuting. python Algebraically why must a single square root be done on all terms rather than individually? How can I iterate through a 2D list to just get the first index within each list? "Who you don't know their name" vs "Whose name you don't know". Python's list Data Type: A Deep Dive With Examples By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. Were all of the "good" terminators played by Arnold Schwarzenegger completely separate machines? The map () function applies a given function to each item of an iterable (like a list) and returns a list of the results. you have a nested list that you can access this way: To have the second element (the element with index 1) of each sublist, I would suggest a list comprehension: If you want the last element (the element with index -1) of each sublist, you just have to change the index: For the list you shown the two lines will give the same list, but when the sublists have more than two elements the two solution will give different results. New! Why would a highly advanced society still engage in extensive agriculture? We can easily find the second smallest value in a list using a loop in Python. Then it iterates through the list, checking to see if any values are lower than the lowest so far, or the second lowest so far. Thanks for contributing an answer to Stack Overflow! Join two objects with perfect edge-flow at any stage of modelling? Asking for help, clarification, or responding to other answers. To learn more, see our tips on writing great answers. @Wayne Werner: Yep. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Were all of the "good" terminators played by Arnold Schwarzenegger completely separate machines? How do I split a list into equally-sized chunks? Previous owner used an Excessive number of wall anchors. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. yaused your solution, and its working for me thankx again! Because -8 < -7, Python replaces your start value with 0, which results in a slice that contains the items from 0 to the end of the list. Asking for help, clarification, or responding to other answers. How do I get rid of password restrictions in passwd. Making statements based on opinion; back them up with references or personal experience. Why do code answers tend to be given in Python when no language is specified in the prompt? I seek a SF short story where the husband created a time machine which could only go back to one place & time but the wife was delighted, "Pure Copyleft" Software Licenses? Find centralized, trusted content and collaborate around the technologies you use most. How do I get rid of password restrictions in passwd. Asking for help, clarification, or responding to other answers. How can I find the shortest path visiting all nodes in a connected graph as MILP? My sink is not clogged but water does not drain. Why would a highly advanced society still engage in extensive agriculture? Manga where the MC is kicked out of party and uses electric magic on his head to forget things. List of lists middle element extraction in python, Best way to get the nth element of each tuple from a list of tuples in Python. Is it superfluous to place a snubber in parallel with a diode by default? In response to "How do I turn the list into a string": It is returning a dictionary inside of a list, so call the first index of the list to return just the dictionary, then use 'password' as the key for the dictionary to return the password. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. How to iterate over each 2 elements in a list, python3? Find centralized, trusted content and collaborate around the technologies you use most. Why do code answers tend to be given in Python when no language is specified in the prompt? Return a list of tuples, where each tuple contains the i-th element Sci fi story where a woman demonstrating a knife with a safety feature cuts herself when the safety is turned off. accessing second value in python list loop. Did active frontiersmen really eat 20,000 calories a day? second_to_last = my_list [-2]. Do the 2.5th and 97.5th percentile of the theoretical sampling distribution of a statistic always contain the true population parameter? How do I get the number of elements in a list (length of a list) in Python? So the final code will look somewhat closer to this: If getting the indices of the keyword is the only thing you need to do, then storing strings in a list is unnecessary (even if this was just an example you thought of!). How do I split a list into equally-sized chunks? Is it unusual for a host country to inform a foreign politician about sensitive topics to be avoid in their speech? OverflowAI: Where Community & AI Come Together, Behind the scenes with the folks building OverflowAI (Ep.
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