Question

我正在尝试按以下格式读取csv文件：

number,alphabet
1,a
2,b
3,c
2,b
1,a

我创建字典的代码：

alpha = open('alpha.csv','r')
csv_alpha = csv.reader(alpha)

alpha_file = {row[0]:row[1] for row in csv_alpha}

输出：

alpha_file = { 1:'a', 2:'b', 3:'c' }

通过查看文件，1和2具有重复值。

我怎样才能将输出更改为：

alpha_file = { 1:'a', 1:'a', 2:'b', 2:'b', 3:'c' }

LNG - PYTHON

Answer 1

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list

输出将如下：

alpha = open('alpha.csv','r')
csv_alpha = csv.reader(alpha)

alpha_file = dict()
for row in csv_alpha:
    if row[0] in alpha_file:
        alpha_file[row[0]].append(row[1])
    else:
        alpha_file[row[0]] = [row[1]]

输出密钥出现次数，使用{ 1:['a','a'],2:['b','b'], 3:['c'] }循环

for

输出如下：

d = { 1:['a','a'],2:['b','b'], 3:['c'] }
amount = []
for key, value in d.iteritems():
    amount += [key] * len(value)
print amount

字典中的重复值

1 个答案: