为什么我的python dict变得无序？

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我正在使用这个产品，在多年的时间内，以特定字母开头的名字的百分比。当绘制（和打印）我的diction（letter_d）时，键是无序的，而不是像它们被添加到dict中的顺序。有没有办法解决这个问题，我相信我会按顺序将它们添加到dict中。如果不是有一种方法，我可以创建连接我的散点图的点，以模拟正确的线条图？

I am using this to produce a plot of % of names starting with a certain letter over a span of years. When plotting (and printing) my diction (letter_d) the keys are disordered rather than being sequential like how they are added to the dict. Is there a way to fix this, I believe I am adding them to the dict in a sequential order. If not is there a way I can create connect the dots of my scatter plot in order to simulate the correct line plot?

import csv import matplotlib.pyplot as plt start = 1880 stop = 1890 x = [] years = range(start, stop +1) print years letter_d = {} year_d = {} alphabet = ['Z']#,'C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'] for i in alphabet: letter_d[i] = 0 for year in years: filename = 'yob' + str(year) + '.txt' z = open(filename) year_d[int(year)] = 0 letter_d[i] = year_d c = 0 d = 0 for line in z: y = line.strip().split(',') y.remove(y[1]) c += int(y[1]) if i in y[0]: d += int(y[1]) year_d[year] = float(d)/float(c) #x.append(y) #print year_d print year_d.keys() plt.plot(year_d.keys(), year_d.values()) plt.show()

推荐答案

Python字典总是无序。

Python dictionaries are always unordered.

在您的情况下，您根本不需要字典 。使用两个列表;一个是您从一个范围生成的年份列表，另一个是计算值：

In your case, you don't need a dictionary at all. Use two lists; one is the years list you already produced from a range, the other for the calculated values:

year_values = [] for year in years: # ... year_values.append(float(d)/float(c)) plt.plot(years, year_values)