[英]read file into list separating values
我正在從文件中分離值和鍵,因此如果文件中存在單詞,則將值添加到列表中。 使用字典並添加值和鍵是否更有效? 在text.txt中看起來像這樣:
eggs=2, bread=1, milk=4
eggs=5, bread=2, milk=2
eggs=1, bread=3, milk=3
我想將值和鍵拆分為單獨的列表,以便以后可以使用它來計算雞蛋的數量等
egg_list =[]
with open("text.txt") as f:
for line in f:
lines = f.read().splitlines()# creates a list of the file
lines.split("=") # or split on ","?
if "eggs" in line: # checks if the string "eggs" exists in the list
#if so add the value after"=" into the list
egg_list.append(lines[0]+1)#should list 2,5,1
if "bread" #same for bread ect
我們可以在這里使用itertools.groupby ,並創建一個包含每行字典的列表
from itertools import groupby
with open('text.txt') as f:
content = [line.strip('\n ') for line in f]
content = [i.split(',') for i in content]
lista = []
for i in content:
lista.append(dict([j.split('=') for j in i]))
total_eggs= sum([int(k) for k, g in groupby(lista, key=lambda x: x['eggs'])])
print(lista)
# [{'eggs': '2', ' bread': '1', ' milk': '4'}, {'eggs': '5', ' bread': '2', ' milk': '2'}, {'eggs': '1', ' bread': '3', ' milk': '3'}]
print(total_eggs)
# 8
另一種方法是在此處使用defaultdict來設置一些字典,這些字典將以有組織的方式存儲來自文本文件的信息,您可以在其中訪問該文件並在以后更輕松地進行操作
from collections import defaultdict
with open('text.txt') as f:
content = [line.strip('\n ') for line in f]
dd = defaultdict()
content = [i.split(',') for i in content]
for i, v in enumerate(content):
dd[i] = dict([j.split('=') for j in v])
print(dd)
# {0: {'eggs': '2', ' bread': '1', ' milk': '4'}, 1: {'eggs': '5', ' bread': '2', ' milk': '2'}, 2: {'eggs': '1', ' bread': '3', ' milk': '3'}})
print(sum([int(dd[k]['eggs']) for k in dd]))
# 8
沒有值的keys
工作方法:
with open('text.txt') as f:
content = [line.strip('\n ') for line in f]
content = [i.split(',') for i in content]
lista = []
for i in content:
for j in i:
if len(j.split('=')) > 1:
lista.append({j.split('=')[0]: j.split('=')[1]})
else:
lista.append({j: 0})
total_eggs = sum([int(v) for i in lista for k, v in i.items() if 'eggs' in k])
您可以使用dict理解將文件讀入列表的dict中:
{g[0][0]: [v for _, v in g] for g in zip(*([t.split('=') for t in l.split(', ')] for l in f))}
因此,鑒於您從文件對象f
輸入了示例輸入,以上代碼將返回:
{'eggs': ['2', '5', '1'], 'bread': ['1', '2', '3'], 'milk': ['4 ', '2', '3']}
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