tuples

问题 I need to sort a list of tuples in Python by a specific tuple element, let's say it's the second element in this case. I tried sorted(tupList, key = lambda tup: tup[1]) I have also tried sorted(tupList, key = itemgetter(1)) '''i imported itemgetter, attrgetter, methodcaller from operator''' but the list was returned the same both times. I checked sorting tuples in python with a custom key sort tuples in lists in python https://wiki.python.org/moin/HowTo/Sorting 回答1: I'm guessing you're

问题 So I am making a camel game and I get a weird error that says "TypeError: '>' not supported between instances of 'tuple' and 'int'" and I am not sure what this means, I have posted before and I will state this again I am a beginner coder. Thank you to whoever helps here is the code and I will put a comment where the error is that you! import random done = False milesTraveled = 0 thirst = 0 camelTired = 0 nativesDis = -20 canteens = 5 print(''' Welcome to Camel! You have stolen a camel to make

问题 I have a static_loop construct like this template <std::size_t n, typename F> void static_loop(F&& f) { static_assert(n <= 8 && "static loop size should <= 8"); if constexpr (n >= 8) f(std::integral_constant<size_t, n - 8>()); if constexpr (n >= 7) f(std::integral_constant<size_t, n - 7>()); if constexpr (n >= 6) f(std::integral_constant<size_t, n - 6>()); if constexpr (n >= 5) f(std::integral_constant<size_t, n - 5>()); if constexpr (n >= 4) f(std::integral_constant<size_t, n - 4>()); if

问题 I have this list of tuples [('Jem', 10), ('Sam', 10), ('Sam', 2), ('Jem', 9), ('Jem', 10)] How do I find the average of the numbers coupled with each name, i.e. the average of all the numbers stored in a tuple with Jem, and then output them? In this example, the output would be: Jem 9.66666666667 Sam 6 回答1: There's a couple ways to do this. One is easy, one is pretty. Easy: Use a dictionary! It's easy to build a for loop that goes through your tuples and appends the second element to a

问题 I have the following type: type Rating = (String, Int) type Film = (String, String, Int, [Rating]) testDatabase :: [Film] testDatabase = [("Director 1","Film 1",2012,[("TestRat",8)]),("Director 2","Film 2",2,[])] I need to find out what the average rating of the Director is based on all of their films combined and then all of their ratings combined. I genuinely have no idea how to approach this, I found it hard enough just to get the average of the tuples in the Film let alone work through

问题 I have the following type: type Rating = (String, Int) type Film = (String, String, Int, [Rating]) testDatabase :: [Film] testDatabase = [("Director 1","Film 1",2012,[("TestRat",8)]),("Director 2","Film 2",2,[])] I need to find out what the average rating of the Director is based on all of their films combined and then all of their ratings combined. I genuinely have no idea how to approach this, I found it hard enough just to get the average of the tuples in the Film let alone work through

问题 I want to find the matching item from the below given list.My List may be super large. The very first item in the tuple "N1_10" is duplicated and matched with another item in another array tuple in 1st array in the ListA ('N1_10', 'N2_28') tuple in 2nd array in the ListA ('N1_10', 'N3_98') ListA = [[('N1_10', 'N2_28'), ('N1_35', 'N2_44')], [('N1_22', 'N3_72'), ('N1_10', 'N3_98')], [('N2_33', 'N3_28'), ('N2_55', 'N3_62'), ('N2_61', 'N3_37')]] what I want for the output is output --> [('N1_10',

问题 Using pandas, I have exported to a csv file a dataframe whose cells contain tuples of strings. The resulting file has the following structure: index,colA 1,"('a','b')" 2,"('c','d')" Now I want to read it back using read_csv. However whatever I try, pandas interprets the values as strings rather than tuples. For instance: In []: import pandas as pd df = pd.read_csv('test',index_col='index',dtype={'colA':tuple}) df.loc[1,'colA'] Out[]: "('a','b')" Is there a way of telling pandas to do the

问题 This question already has answers here : When are parentheses required around a tuple? (3 answers) Closed 5 years ago . So I stumbled into a particular behaviour of tuples in python that I was wondering if there is a particular reason for it happening. While we are perfectly capable of assigning a tuple to a variable without explicitely enclosing it in parentheses: >>> foo_bar_tuple = "foo","bar" >>> we are not able to print or check in a conditional if statement the variable containing the

问题 I've got a custom class that has a tuple-like interface. Because I want my code to be as generic as possible, I thought that it would be a good idea to base my algorithms on the functions std::get , std::tuple_size , std::tuple_element so you just have to specialize these functions to use my algorithms. Let's call the concept that requires these function specializations Tuple . Now I am trying to sum up the components of a Tuple . The function declaration should be something like this: