Question

我有一个脚本，用于处理从Web API返回的数据。返回的数据是字典列表的字符串表示形式。

我知道ast.literal_eval（）可以将字典的字符串表示形式转换为真实的形式。

数据看起来像这样（提醒：这些是字符串，而不是字典）：

new = [{"id": "L0", "tags": null, "disable": false},
       {"id": "L1", "tags": null, "disable": false},
       {"id": "L2", "tags": null, "disable": false}]

因为'null'和'false'不在引号中，所以ast.literal_eval（）失败并出现错误。如果我在上面的null和false处手动添加引号，则效果很好。

我试图通过这些字符串进行迭代，并将子字符串null和false修改为“ null”和“ false”，但这无济于事：

for i in new:
    i.replace("null", "\"null\"")
    i.replace("false", "\"false\"")

如何修改这些子字符串以添加引号？如果可能的话，我宁愿修改现有列表（new []）而不是创建一个新列表，但是如果我必须创建一个新列表才能使其正常工作，那我将这样做。

Answer 1

@MarkS ，如果 new 是词典列表的字符串表示形式，那么您也可以尝试以下代码。

from ast import literal_eval

new = '''[{"id": "L0", "tags": null, "disable": false},
       {"id": "L1", "tags": null, "disable": false},
       {"id": "L2", "tags": null, "disable": false}]'''

new = new.replace('false', '\"false\"')
new = new.replace('null', '\"null\"')

print(new)
"""
    [{"id": "L0", "tags": "null", "disable": "false"},
       {"id": "L1", "tags": "null", "disable": "false"},
       {"id": "L2", "tags": "null", "disable": "false"}]
"""

print(literal_eval(new))
"""
    [{'id': 'L0', 'tags': 'null', 'disable': 'false'}, {'id': 'L1', 'tags': 'null', 'disable': 'false'}, {'id': 'L2', 'tags': 'null', 'disable': 'false'}]
"""

Answer 2

您可以在运行

205729.68706, 3,   0.464, -0.425,  9.903, 4,  -0.000,  0.001, -0.000, 5,  36.290,  4.707,-24.930205729.88997, 3,   0.443, -0.433,  9.885, 4,  -0.000,  0.001,  0.000205730.09288, 3,   0.465, -0.446,  9.894, 4,  -0.000, -0.000, -0.000, 5,  37.206,  5.412,-24.298205730.29576, 3,   0.468, -0.432,  9.897, 4,  -0.000, -0.000, -0.000, 5,  36.308,  5.411,-25.554205730.49867, 3,   0.442, -0.424,  9.883, 4,   0.000,  0.000, -0.000, 5,  36.868,  4.611,-26.465205730.70155, 3,   0.467, -0.444,  9.888, 4,  -0.000,  0.000, -0.000, 5,  37.498,  5.637,-25.841205730.90446, 3,   0.464, -0.435,  9.904, 4,  -0.001,  0.000, -0.000, 5,  36.301,  5.049,-24.931205731.10734, 3,   0.440, -0.432,  9.876, 4,  -0.000, -0.000, -0.000, 5,  36.308,  5.605,-26.483205731.31026, 3,   0.460, -0.440,  9.906, 4,  -0.000,  0.000,  0.000, 5,  35.706,  5.025,-24.944205731.51317, 3,   0.458, -0.434,  9.909, 4,   0.000,  0.000, -0.000, 5,  35.374,  4.218,-26.492

之前修改数据，可能使用

205729.68706, 3,   0.464, -0.425,  9.903, 4,  -0.000,  0.001, -0.000, 5,  36.290,  4.707,-24.930205729.88997, 3,   0.443, -0.433,  9.885, 4,  -0.000,  0.001,  0.000205730.09288, 3,   0.465, -0.446,  9.894, 4,  -0.000, -0.000, -0.000, 5,  37.206,  5.412,-24.298205730.29576, 3,   0.468, -0.432,  9.897, 4,  -0.000, -0.000, -0.000, 5,  36.308,  5.411,-25.554205730.49867, 3,   0.442, -0.424,  9.883, 4,   0.000,  0.000, -0.000, 5,  36.868,  4.611,-26.465205730.70155, 3,   0.467, -0.444,  9.888, 4,  -0.000,  0.000, -0.000, 5,  37.498,  5.637,-25.841205730.90446, 3,   0.464, -0.435,  9.904, 4,  -0.001,  0.000, -0.000, 5,  36.301,  5.049,-24.931205731.10734, 3,   0.440, -0.432,  9.876, 4,  -0.000, -0.000, -0.000, 5,  36.308,  5.605,-26.483205731.31026, 3,   0.460, -0.440,  9.906, 4,  -0.000,  0.000,  0.000, 5,  35.706,  5.025,-24.944205731.51317, 3,   0.458, -0.434,  9.909, 4,   0.000,  0.000, -0.000, 5,  35.374,  4.218,-26.492

模块：

输出：

ast.literal_eval()

str.replace（）将char替换为“ char”

2 个答案: