如何将CSV数据导入到单个列表并将一些值附加到该列表

Question

我的代码：

import os
import csv
mylist = []
data = os.getcwd() + '/' + 'filename.csv'
with open(data, 'r') as file:
read = csv.reader(file)
mylist = list(read)
print(mylist)
mylist.append('hello')
print(mylist)

打印时，输出显示：

[['25', '50', '33', '24', '214', '1587']]
[['25', '50', '33', '24', '214', '1587'], 'hello']

导入CSV数据是作为列表中的列表加载的。但我需要在一个列表中添加相同的值，以便稍后在同一列表中添加一些值，如"hello"。

示例：(我需要相同的)

['25', '50', '33', '24', '214', '1587', 'hello']

请提供修复：

Answer 1

从itertools:使用chain.from_iterables

import itertools
mylist = [['1', '2'], ['3', '4'], ['5', '6'], ['7', '8']]
mylist = list(itertools.chain.from_iterable(mylist))
mylist.append('hello')

>>> mylist
['1', '2', '3', '4', '5', '6', '7', '8', 'hello']

Answer 2

追加前后输出：

['25', '50', '33', '24', '214', '1587']
['25', '50', '33', '24', '214', '1587', 'hello']

代码：

import os
import csv
mylist = []
data = os.getcwd() + '/' + 'filename.csv'
with open(data, 'r') as file:
read = csv.reader(file)
mylist = list(read)
print(mylist)
y=[]
for x in range(len(mylist)):
y.append(mylist[x])
mylist = y
mylist.append('hello')
print(mylist)

Answer 3

您可以使用：

import os
import csv
mylist = []
data = os.getcwd() + '/' + 'filename.csv'
with open(data, 'r') as file:
read = csv.reader(file)
mylist = list(read)
print(mylist)
mylist2 = mylist[0]
mylist2.append('hello')
print(mylist2)

其中mylist2 = mylist[0]假设您读取csv文件的列表为1级嵌套列表。然后，您可以将新值附加到新列表mylist2中