python - 在 for 循环中将字符串收集到列表中

Question

我正在读取一个文件，我在其中解析每一行中的特定字符串。在每一行中找到特定的字符串。现在我试图将这些字符串收集到一个列表中，但它不起作用。

with open('readfile.txt',"r") as data:
myList = []

for lines in data

    myValues = re.findall(.......)  #that's so far OK, regex finds data of interest

    collect_ToList = myList.append(myValues)

    print(collect_ToList )

输出:

None
None
None
None
None
None
None
None
None

调试信息:

print(type(myValues)) 

输出:

<type 'str'>
<type 'str'>
<type 'str'>
<type 'str'>
<type 'str'>
<type 'str'>
<type 'str'>
<type 'str'>
<type 'str'>

我做错了什么？

Answer 1

myList.append(item) 添加item到myList，不需要像collect_ToList<那样将输出保存在变量中.

with open('readfile.txt',"r") as data:
    myList = []
    for lines in data:
        myValues = re.findall(.......)
        myList.append(myValues)
print(myList)

你也可以一行完成:

with open('readfile.txt',"r") as data:
    myList = [re.findall(.......) for lines in data]
print(myList)