《Head First Programming》---python 4_文件和数组中的数据
本章主要是利用数组(python中是指代列表)和python内置函数sort实现对指定文本中的数据进行排序和显示。
文本result.txt中的数据如下所示：
Johnny 8.65
Juan 9.12
Joseph 8.45
Stacey 7.81
Aideen 8.05
Zack 7.21
Aaron 8.31
1.实现代码：
scores = [] #空列表
result_f = open("result.txt")
for line in result_f:
(name, score) = line.split()
scores.append(float(score))
result_f.close()
scores.sort()#降序排序
scores.reverse()#反序排序
print("The top scores were : ")
print(scores[0])
print(scores[1])
print(scores[2])
2.实现结果：
Python 3.3.5 (v3.3.5:62cf4e77f785, Mar 9 2014, 10:37:12) [MSC v.1600 32 bit (Intel)] on win32 Type "copyright", "credits" or "license()" for more information. >>> ================================ RESTART ================================ >>> The top scores were : 9.12 8.65 8.45 >>>
但是没有关联名称和数值...
3.利用hash(python里值字典)实现名称和数据的关联
hash实现代码如下：
scores = {} #hash空表
result_f = open("result.txt")
for line in result_f:
(name, score) = line.split()
scores[score] = name
result_f.close()
print("The top scores were : ")
for each_score in sorted(scores.keys(), reverse = True):
print('Surfer ' + scores[each_score] + ' scored ' + each_score)
4.实现结果：
Python 3.3.5 (v3.3.5:62cf4e77f785, Mar 9 2014, 10:37:12) [MSC v.1600 32 bit (Intel)] on win32 Type "copyright", "credits" or "license()" for more information. >>> ================================ RESTART ================================ >>> The top scores were : Surfer Juan scored 9.12 Surfer Johnny scored 8.65 Surfer Joseph scored 8.45 Surfer Aaron scored 8.31 Surfer Aideen scored 8.05 Surfer Stacey scored 7.81 Surfer Zack scored 7.21 >>>