读取数字列表并将其保存为python文本文件中的数字

Question

我有python中的浮点数列表。我想把一些列表保存在txt文件中，我按原样一个列表一个列表地阅读它们。但是在我写了下面的代码之后，我发现str(I)转换了一个str中的每个数字。我不能像它们写的那样好地读取它们。Ps我有10,000个结果列表，所以我想将每个列表保存在一行中。

result = [-0.33434,0.4434, 4343....]
with open("out.txt", w) as out:
for i in result:
out.write(str(i)+' ')
out.write("n")

Answer 1

更新答案

对于多个列表，将它们全部放在一个列表中，并将其写入pkl/txt文件。

import pickle
import numpy as np
results = [
[1.456,2.245,-3.441], 
[4.53, 4.55, 1.22]
]
np.savetxt("results.txt", results)   # write
#read
result = np.loadtxt("results.txt")
print(result.tolist())

如果您希望将名称与您的列表相关联，请考虑使用dict。但是，您只能使用pickle。

import pickle
results = {
"result1": [1.456,2.245,-3.441], 
"result2": [4.53, 4.55, 1.22],
}
# write
with open("results.pkl", "wb") as resultFile:
pickle.dump(results, resultFile)

# read
with open("results.pkl", "rb") as resultFile:
result = pickle.load(resultFile)
print(result)

---

原始回答

使用pickle或numpy，因为它们更适合此任务。

使用pickle:

import pickle
result1 = [1.456,2.245,-3.441]
# write
with open("result1.pkl", "wb") as resultFile:
pickle.dump(x, resultFile)
# read
with open("result1.pkl", "rb") as resultFile:
result = pickle.load(resultFile)
print(result)

使用numpy:

import numpy as np
result1 = [1.456,2.245,-3.441]
np.savetxt("result1.txt", result1)   # write
#read
result = np.loadtxt("result1.txt")
print(result.tolist())

Answer 2

如果您不想使用库来完成此操作，您可以简单地将每个列表用已知的分隔符join，然后将结果字符串写入文件。

这里，我假设您有一个名为allResults的列表列表，其格式为

allResults = [
[-0.332,434,0.4434,4865],
[9.456,-0.540,-7.06540,5.05453],
# ... and so on
]
separator = "," 
with open("out.txt", "w") as out_file:
for l in allResults:
out_string = separator.join(str(x) for x in l) + "n"
out_file.write(out_string)

现在，out.txt包含:

-0.332,434,0.4434,4865
9.456,-0.54,-7.0654,5.05453

然后读取文件，你可以读取每一行，用分隔符拆分它，将拆分字符串的每个元素转换为浮点数，并将新列表放入列表的列表中:

all_lists = []
with open("out.txt", "r") as in_file:
for line in in_file:
new_list = [float(x) for x in line.split(separator)]
all_lists.append(new_list)

现在你的列表列表回来了:

all_lists: [[-0.332, 434.0, 0.4434, 4865.0], [9.456, -0.54, -7.0654, 5.05453]]

Answer 3

如果您想再读一遍，请读取该行并以' '(空格)分隔。这将为您提供浮点数的字符串表示形式。之后，您可以使用float(num)方法将其转换回数字