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[英]I want to create a nested dictionary from a csv file with headers as keys
[英]How can I create a nested dictionary containing info. from csv file
我正在研究 cs50 的 pset6、DNA,我想讀取一個看起來像這樣的 csv 文件:
name,AGATC,AATG,TATC
Alice,2,8,3
Bob,4,1,5
Charlie,3,2,5
我想要創建的是一個嵌套字典,它看起來像這樣:
data_dict = {
"Alice" : {
"AGATC" : 2,
"AATG" : 8,
"TATC" : 3
},
"Bob" : {
"AGATC" : 4,
"AATG" : 1,
"TATC" : 5
},
"Charlie" : {
"AGATC" : 3,
"AATG" : 2,
"TATC" : 5
}
}
所以我想用這個:
with open(argv[1]) as data_file:
for i in data_file:
(或其他變體)循環遍歷csv
文件和append
到字典中,添加所有值,以便我有一個以后可以訪問的數據庫。
您應該使用 python 的csv.DictReader模塊
import csv
data_dict = {}
with open(argv[1]) as data_file:
reader = csv.DictReader(data_file)
for record in reader:
# `record` is a OrderedDict (type of dict) of column-name & value.
# Instead of creating the data pair as below:
# ```
# name = record["name"]
# data = {
# "AGATC": record["AGATC"],
# "AATG": record["AATG"],
# "TATC": record["TATC"],
# ...
# }
# data_dict[name] = data
# ```
# you can just delete the `name` column from `record`
name = record["name"]
del record["name"]
data_dict[name] = record
print(data_dict)
使用簡單的文件讀取
with open(argv[1], 'r') as data_file:
line = next(data_file) # get the first line from file (i.e. header)
hdr = line.rstrip().split(',') # convert header string to comma delimited list
# ['name', 'AGATC', 'AATG', 'TATC']
data_dic = {}
for line in data_file:
line = line.rstrip().split(',')
# name and dictionary for current line
data_dic[line[0]] = {k:v for k, v in zip(hdr[1:], line[1:])}
print(data_dic)
Output
{'Alice': {'AATG': '8', 'AGATC': '2', 'TATC': '3'},
'Bob': {'AATG': '1', 'AGATC': '4', 'TATC': '5'},
'Charlie': {'AATG': '2', 'AGATC': '3', 'TATC': '5'}}
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