tuples

问题 This question already has answers here : Converting a string of tuples to a list of tuples in Python (3 answers) Closed last year . I have a list of tuples saved into a string (unfortunately). I am looking for a fast an efficient way to convert this string to an actual list of tuples. Example: mylist_string = '[(40.7822603, -73.9525339), (40.7142, -74.0087), (40.7250027, -73.9413106), (40.703422, -73.9862948), (40.7169963, -74.0149991), (40.7420448, -73.9918131), (40.7287, -73.9799), (40

问题 I'm new around programming stuff :/ I need to make a function that retrieve the sum of the first element from a 3-tuple list. I have something like: tuples = [(11,"11","11"),(22,"22","22"),(33,"33","33"),(44,"44","44"),(55,"55","55"),(66,"66","66")] And I need the sum of the first element of each 3-tuple from the list. = 11+22+33+44+55 Pattern matching maybe? map? 回答1: Use sum with a list comprehension: sum [x | (x, _, _) <- tuples] 回答2: If you want something pointfree, you could try: > let f

问题 I'm a reading a text file with several hundred lines of data in python. The text file contains data written as a tuple assignment. For example, the data looks exactly like this in the text file: d1: p,h,t,m= 74.15 18 6 0.1 ign: 0.0003 d2: p,h,t,m= 54. 378 -0.14 0.1 ign: 0.0009 How can I separate the data as such: p = 20 t = 15 etc. Then, how can I perform calculations on the tuple assignment? For example calculate: p*p = 20*15? I am not sure if I should convert the tuple assignment to an

问题 I'm a reading a text file with several hundred lines of data in python. The text file contains data written as a tuple assignment. For example, the data looks exactly like this in the text file: d1: p,h,t,m= 74.15 18 6 0.1 ign: 0.0003 d2: p,h,t,m= 54. 378 -0.14 0.1 ign: 0.0009 How can I separate the data as such: p = 20 t = 15 etc. Then, how can I perform calculations on the tuple assignment? For example calculate: p*p = 20*15? I am not sure if I should convert the tuple assignment to an

问题 I'm trying to find a better way of doing a Crystal Report (Someone Else's)... Add up non-overlapping time in groups. This is evidently an age-old problem... Is there a technique of getting Adjusted (start/end) times, per record, to remove common/over-lap time, within subgroups --using straight SQL (although I find I can do CTEs) Assume initial order-by for Start Time (and/or Group, SubGroup) and Start and End are separate fields. A kind-a graphic example: Group 1 SubGroup A Tkt 1 |--start&end

问题 Suppose that I have two, for example, float arrays a and b , an int key array k and a template mySortByKey function of my own, operating on a single array, something like template<class T> mySortByKey(int *k, T *a) Is there a possibility (for example, using zip iterators and tuples of some sorts) to enable mySort operating simultaneously on a and b , so that they can be simultaneously ordered according to the key k ? 回答1: I don't think you can do that. However, you can accomplish something

问题 I have a list of tuples namely: [[[('p', 'u'), ('r', 'w')], [('t', 'q')]], [[('p', 'u'), ('r', 'w')], [('v', 'q')]], [[('p', 'u'), ('r', 'w')], [('t', 's')]], [[('p', 'u'), ('r', 'w')], [('v', 's')]], [[('p', 'w'), ('r', 'u')], [('t', 'q')]], [[('p', 'w'), ('r', 'u')], [('v', 'q')]], [[('p', 'w'), ('r', 'u')], [('t', 's')]], [[('p', 'w'), ('r', 'u')], [('v', 's')]], [[('r', 'u'), ('p', 'w')], [('t', 'q')]], [[('r', 'u'), ('p', 'w')], [('v', 'q')]], [[('r', 'u'), ('p', 'w')], [('t', 's')]], [[

问题 This question already has answers here : How do I sort a dictionary by value? (34 answers) Closed 3 years ago . How to sort a tuple of elements in python, first on the basis of value and then on the basis of key. Consider the program in which I am taking input from the user as a string. I want to find out the count of each character and print the 3 most common characters in a string. #input string strr=list(raw_input()) count=dict() #store the count of each character in dictionary for i in

问题 I'm trying to combine pairs of numbers passed in via sys.argv . Example: python myscript.py -35.12323 112.76767 -36.33345 112.76890 -33.68689 111.8980 My goal would be to turn these into sets of two's in tuples. Like such: ((-35.12323,112.76767),(-36.33345,112.76890),(-33.68689,111.8980)) This is what I've tried to so far, but it has a problem when I pass the results to the Shapely Point and Polygon methods. from shapely.geometry import Polygon from shapely.geometry import Point import sys

问题 I'm trying to combine pairs of numbers passed in via sys.argv . Example: python myscript.py -35.12323 112.76767 -36.33345 112.76890 -33.68689 111.8980 My goal would be to turn these into sets of two's in tuples. Like such: ((-35.12323,112.76767),(-36.33345,112.76890),(-33.68689,111.8980)) This is what I've tried to so far, but it has a problem when I pass the results to the Shapely Point and Polygon methods. from shapely.geometry import Polygon from shapely.geometry import Point import sys