Python：按字母顺序排列和排序

Question

我需要编写一个程序，它接受用户输入的年份并从 CSV 文件中读取信息，然后将结果导出到屏幕上。 csv 源文件格式为：year, name, count, gender，导出结果为boy only，格式为Name Count，按字母顺序排列。

输入文件：

2010,Ruby,440,Female

2010,Cooper,493,Male

输出：

Please enter the year: 2010
Popular boy names in year 2010 are:
     Aidan  112

运行程序时出现错误：

Please enter the year: 2014
    Traceback (most recent call last):
      File "E:\SIT111\A1\printBoynameTPL.py", line 26, in <module>
        year, name, count, gender = row
    ValueError: need more than 0 values to unpack

这是我的代码：

'''
This program accepts a year as input from a user and print boys' information of the year. The output should be  sorted by name in alphabetical order.


Steps:
1. Receive a year from a user

2. Read CSV files: 
Format: year, name, count, gender

3. Display popular boy names  on the screen:
Format:    Name     Count

'''

import csv

inputYear = raw_input('Please enter the year: ')
inFile = open('output/babyQldAll.csv', 'rU')
cvsFile = csv.reader(inFile, delimiter=',')

dict = {}

for row in  cvsFile:
    year, name, count, gender = row  

    if (year == inputYear) and (gender == 'Boy'):
        dict[name] =  count

print('Popular boy names in year %s are:' % inputYear)

# +++++ You code here ++++
# According to informaiton in 'dict',  print (name, count) sorted by 'name' in alphabetical order         
sortedName = shorted(dict.keys())
for name in sortedName:
    print(name, dict[name])
print("Print boy names... ")    


inFile.close()

我编辑了一下：

for row in  cvsFile:
        if row:
            year, name, count, gender = row  

            if (year == inputYear) and (gender == 'Male'):
                dict[name] =  count  
print('Popular boy names in year %s are:' % inputYear)
# +++++ You code here ++++
# According to informaiton in 'dict',  print (name, count) sorted by 'name' in alphabetical order         
sortedName = sorted(dict.keys())
for name in sortedName:
        print(name,dict[name])
print("Print boy names... ")    

我做错了吗？缩进还是……？

结果：

>>> 
Please enter the year: 2013
Popular boy names in year 2013 are:
Print boy names... 
>>> 

Answer 1

您的 csv 文件中似乎有空行，这导致空的 row 来迭代 csv 文件。在执行其余逻辑之前，您可以简单地检查 row 是否为空。示例 -

for row in  cvsFile:
    if row:
        year, name, count, gender = row  

        if (year == inputYear) and (gender == 'Boy'):
            dict[name] =  count

另外，你不应该使用dict作为变量名，它会影响内置函数dict()。

另外，你的程序中还有一个错字 -

sortedName = shorted(dict.keys())

我猜你打算使用sorted()。