[英]how to create dictionary with comma separated file
Plz suggest how to create dictionary from the following file contetns请建议如何从以下文件内容创建字典
2,20190327.1.csv.gz
3,20190327.23.csv.gz
4,20190327.21302.csv.gz
2,20190327.24562.csv.gz
my required output is我需要的输出是
{2:20190327.1.csv.gz:982, 3:20190327.23.csv.gz, 4:20190327.21302.csv.gz, 2:20190327.24562.csv.gz}
I am new to python and I tried below code but It is not working.我是 python 的新手,我尝试了下面的代码,但它不起作用。 Please suggest
请建议
from __future__ import print_function
import csv
file = '/tmp/.fileA'
with open(file) as fh:
rd = csv.DictReader(fh, delimiter=',')
for row in rd:
print(row)
The problem is because the DictReader
thinks first row is field mapping, so number 2 will be used as key for next rows.问题是因为
DictReader
认为第一行是字段映射,所以数字 2 将用作下一行的键。 Also, you can't use same key twice, hence one of the situations where 2 is used as key will be overwritten.此外,您不能两次使用相同的密钥,因此将覆盖使用 2 作为密钥的情况之一。
import csv
file = 'data.csv'
my_dict = {}
with open(file) as fh:
rd = csv.reader(fh, delimiter=',')
for row in rd:
my_dict[row[0]] = row[1]
print(my_dict)
Output:输出:
$ python3 reader.py
{'2': '20190327.24562.csv.gz', '3': '20190327.23.csv.gz', '4': '20190327.21302.csv.gz'}
You could use defaultdict
from collections
to handle the unique keys,您可以使用
collections
defaultdict
来处理唯一键,
The csv file, .csv 文件,
$ cat some.csv
2,20190327.1.csv.gz
3,20190327.23.csv.gz
4,20190327.21302.csv.gz
2,20190327.24562.csv.gz
$ cat mkdict.py
import csv
from collections import defaultdict
import pprint
d = defaultdict(list)
with open('some.csv') as csvfile:
reader = csv.reader(csvfile, delimiter=',')
for row in reader:
if row: # taking care for empty lines :)
key, value = row
d[key].append(value)
pprint.pprint(dict(d))
And the output,而输出,
$ python mkdict.py
{'2': ['20190327.1.csv.gz', '20190327.24562.csv.gz'],
'3': ['20190327.23.csv.gz'],
'4': ['20190327.21302.csv.gz']}
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