我很难理解python函数为什么不输出带有附加的杂乱列表的字典,而是创建一个只包含最后创建的列表的字典。我已经重写了这个函数很多次,但是仍然遇到同样的问题。
#simple schedule fitness test run
#imports
from itertools import permutations
import random
import numpy as np
#create teachers with classes and students with classes
brian_classes = ['akstuddies', 'sci_ms', 'sci_ms', 'physics', 'comp_sci', 'conf']
becky_classes = ['akstuddies', 'lit_ms', 'lit_ms', 'lit', 'conf', 'debate']
teachers = [brian_classes, becky_classes]
#creates inital population of n schedules by shuffling the schedule of each teacher n times
def initial_population(teachers_list, population_size):
schudule_list_population = {}
for i in range(0, population_size):
shuffled_teachers = []
schudule_list_population[i] = [teacher for teacher in teachers_list]
for teacher in schudule_list_population[i]:
np.random.shuffle(teacher)
shuffled_teachers.append(teacher)
#print(teacher)
schudule_list_population[i] = shuffled_teachers
print(schudule_list_population)
return schudule_list_population
print(initial_population(teachers, 2))
output:
{0: [['akstuddies', 'conf', 'physics', 'sci_ms', 'sci_ms', 'comp_sci'], ['lit_ms', 'lit', 'conf', 'debate', 'lit_ms', 'akstuddies']]}
{0: [['sci_ms', 'physics', 'comp_sci', 'akstuddies', 'sci_ms', 'conf'], ['conf', 'lit_ms', 'lit_ms', 'akstuddies', 'debate', 'lit']], 1: [['sci_ms', 'physics', 'comp_sci', 'akstuddies', 'sci_ms', 'conf'], ['conf', 'lit_ms', 'lit_ms', 'akstuddies', 'debate', 'lit']]}
{0: [['sci_ms', 'physics', 'comp_sci', 'akstuddies', 'sci_ms', 'conf'], ['conf', 'lit_ms', 'lit_ms', 'akstuddies', 'debate', 'lit']], 1: [['sci_ms', 'physics', 'comp_sci', 'akstuddies', 'sci_ms', 'conf'], ['conf', 'lit_ms', 'lit_ms', 'akstuddies', 'debate', 'lit']]}
发布于 2022-02-27 23:16:09
我认为您希望python为您做一个深度复制,但默认情况下它不会,所以您需要多次存储相同的列表。下面是一个简单的例子
In [1]: sub_list = [1,2,3,4]
In [2]: outer_list=[]
In [3]: outer_list.append(sub_list) # doesn't do a deep copy
In [4]: outer_list.append(sub_list) # doesn't do a deep copy
In [5]: outer_list
Out[5]: [[1, 2, 3, 4], [1, 2, 3, 4]]
In [6]: sub_list[0] = 10
In [7]: outer_list
Out[7]: [[10, 2, 3, 4], [10, 2, 3, 4]]
看看怎么真的只有一张单子?如果你想要一份深度拷贝,你可以做
import copy
outer_list.append(copy.deepcopy(sub_list))
你那乱七八糟的老师名单只是被加到你的字典里好几次了,就像我在这里把它加到我的字典里一样。
https://stackoverflow.com/questions/71289202
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