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我一直試圖弄清楚現在幾個小時。我有這個列表，我需要轉換爲一個浮點數，所以我可以在numpy.corrceof()以及另一個相同的列表中使用它。Python：將負數字符串轉換爲浮點數時遇到的困難

名單，r如下：

>>> print r 
[-0.6680161943319838, -0.7236994219653179, -0.7088915956151035, -0.7388949079089924, -0.7149712092130518, -0.6123110151187905, -0.39853300733496333, -0.017366136034732287, -0.1457800511508952, 0.03546099290780142, 0.0319573901464714, 0.3491027732463295, 0.03203342618384407, 0.2081005586592179, 0.014833127317676267, 0.32045779685264664, 0.31069182389937106, -0.06653225806451614, -0.15583075335397314, -0.2147727272727273, 0.03030303030303036, -0.10076530612244898, -0.2888257575757576, 0.1227106227106227, 0.7095238095238093, 2.808510638297873, 3.7588235294117647, 3.4240506329113924, 4.264900662251656, 5.12345679, 6.34090909090909, 5.666666666666667, 4.163265306122449, 3.611764705882353, 5.439024390243903, 1.9197860962566844, 1.1649484536082475, -0.04081632653061228, -0.17874396135265697, -0.20999999999999996, -0.277511961722488, -0.20197044334975356, -0.2189349112426035, 0.2222222222222222, 0.4134615384615384, 0.47826086956521746, 0.23308270676691714, 0.6120689655172415, 0.9795918367346939, 1.0851063829787235, 1.0294117647058822, 0.6666666666666667, 1.1546391752577319, 1.2065217391304346, 0.69, 0.10204081632653071, -0.009523809523809532, -0.16666666666666666, -0.14193548387096772, -0.24675324675324684, -0.16949152542372878, -0.276923076923077, 0.020000000000000018, 0.7142857142857143, -0.5446009389671361, -0.7401129943502825, -0.7858672376873662, -0.8171641791044777, -0.8, -0.7320388349514564, -0.7327586206896552, -0.7555555555555555, -0.8284883720930233, -0.7833333333333333, -0.8144712430426716, -0.8809523809523809, -0.6120218579234973, -0.33831775700934574, -0.2203672787979967, -0.08688245315161836, -0.19230769230769232, 0.030000000000000072, 0.13725490196078435, 0.24752475247524752, 0.4012219959266802, 0.22448979591836726, 0.19777777777777772, 0.3213483146067415, 0.30714285714285716, 0.5735294117647058, 0.8151515151515153, 0.834375, 1.3636363636363635, 0.7301038062283737, 0.5692307692307691, 0.3015463917525773, 0.6098360655737707, 0.4202898550724638, 0.0975609756097562, 0.6360294117647058, 0.9090909090909091, 0.36, 0.5865384615384615, 0.787709497206704, 1.5943396226415094, 1.7264150943396226, 2.25, 2.88, 1.9901960784313724] 
>>> type(r) 
<type 'str'> 
>>> print len(r) 
2169

當我嘗試執行float(r)：

>>> float(r) 
Traceback (most recent call last): 
    File "<stdin>", line 1, in <module> 
ValueError: could not convert string to float: [-0.6680161943319838, -0.7236994219653179, -0.7088915956151035, -0.7388949079089924, -0.7149712092130518, -0.6123110151187905, -0.39853300733496333, -0.017366136034732287, -0.1457800511508952, 0.03546

從以前的問題，我已經看到了空值""可能會導致問題。不過，我不知道爲什麼列表中會有一個空值。即使在那，我已經嘗試了其他問題的許多方法，如將list轉換爲numpy.array，然後使用s = r[r=='']='0'。但是這仍然不起作用。

任何人有任何提示嗎？

獎勵：

爲什麼len(r)== 2169?我跑到生成列表纔有確切121值列表的代碼。如果你真的數清單，那裏有121個值...任何人都可以解釋這個嗎？

來源

2015-04-02 thefoxrocks

您沒有一個列表。你有一個看起來像一個列表的字符串。 – Kevin 2015-04-02 18:17:29

該字符串是表示浮點列表的JSON字符串。

import json 
data = json.loads(r)

來源

2015-04-02 18:19:04 davidism

Python：將負數字符串轉換爲浮點數時遇到的困難

獎勵：

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