要在列表中列出的 Python 字符串

Question

我刚刚遇到了一个未解决的解决方案；）

我想将一个字符串放入列表列表中。

string = r'ABC:=[[0,0,110],[1,0,0,0],[1,0,0,0],[9e+09,9e+09,9e+09,9e+09,9e+09,9e+09]];'
new_string = string.strip().split('=')
# now new_string[1][:-1] does look like a list of lists but everything i tried i just got a string.

也许这里有人知道我怎么能得到它

data = [[0,0,110],[1,0,0,0],[1,0,0,0],[9e+09,9e+09,9e+09,9e+09,9e+09,9e+09]]

谢谢

Answer 1

使用ast库将字符串转换为数据结构：

import ast

# string is a module in python, to avoid aliasing, use
# variable names that ideally don't shadow builtins
mystring = r'ABC:=[[0,0,110],[1,0,0,0],[1,0,0,0],[9e+09,9e+09,9e+09,9e+09,9e+09,9e+09]];'

# get everything to the right of the = sign, and you don't need the semicolon
mystring = mystring.strip().split('=')[-1].rstrip(';')

# returns a list
mylist = ast.literal_eval(mystring)

[[0, 0, 110], [1, 0, 0, 0], [1, 0, 0, 0], [9000000000.0, 9000000000.0, 9000000000.0, 9000000000.0, 9000000000.0, 9000000000.0]]

Answer 2

eval 也可以正常工作。

mystring = r'ABC:=[[0,0,110],[1,0,0,0],[1,0,0,0],[9e+09,9e+09,9e+09,9e+09,9e+09,9e+09]];'

mystring = mystring.strip().split('=')[-1].rstrip(';')

data = eval(mystring)
print(data)
# output: [[0, 0, 110], [1, 0, 0, 0], [1, 0, 0, 0], [9000000000.0, 9000000000.0, 9000000000.0, 9000000000.0, 9000000000.0, 9000000000.0]]