[英]How to extract a list from a string in a list in python
我從一個 txt 文件中讀取了一個列表,我得到了一個這樣的列表:
["[21049090, 'AARTIIND22AUGFUT', 'AARTIIND', 850, 1793]", "[21049346, 'ABB22AUGFUT', 'ABB', 250, 3329]"]
此列表中的每個列表項都是 str 類型,這是一個問題。
它應該是這樣的:
[[21049090, 'AARTIIND22AUGFUT', 'AARTIIND', 850, 1793], [21049346, 'ABB22AUGFUT', 'ABB', 250, 3329]]
我怎么做?
考慮使用literal_eval
:
from ast import literal_eval
txt = ["[21049090, 'AARTIIND22AUGFUT', 'AARTIIND', 850, 1793]", "[21049346, 'ABB22AUGFUT', 'ABB', 250, 3329]"]
result = [literal_eval(i) for i in txt]
print(result)
Output:
[[21049090, 'AARTIIND22AUGFUT', 'AARTIIND', 850, 1793], [21049346, 'ABB22AUGFUT', 'ABB', 250, 3329]]
編輯:
或eval()
。 請參閱蒂姆·比格萊森的回答。
使用eval()
function 以及列表理解,我們可以嘗試:
inp = ["[21049090, 'AARTIIND22AUGFUT', 'AARTIIND', 850, 1793]", "[21049346, 'ABB22AUGFUT', 'ABB', 250, 3329]"]
output = [eval(x) for x in inp]
print(output)
這打印:
[
[21049090, 'AARTIIND22AUGFUT', 'AARTIIND', 850, 1793],
[21049346, 'ABB22AUGFUT', 'ABB', 250, 3329]
]
這是我將如何解決它。
from typing import List
def integer_converter(var: str):
try:
# I used float here in case you have any float in those strs
return float(var)
except ValueError:
# if ValueError, then var is a str and cannot be converted. in this case, return str var
return var
def clear_input(raw_input: List[str]) -> List:
raw_input = [x.replace('[','').replace(']','').replace("'",'').replace(' ','').split(',') for x in raw_input]
raw_input = [[integer_converter(x) for x in sublist] for sublist in raw_input]
return raw_input
test = ["[21049090, 'AARTIIND22AUGFUT', 'AARTIIND', 850, 1793]", "[21049346, 'ABB22AUGFUT', 'ABB', 250, 3329]"]
test = clear_input(test)
print(test)
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