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Sova Kefirova
Asked:2020-09-23 03:06:55 +0000 UTC2020-09-23 03:06:55 +0000 UTC

将字符串转换为数字python [关闭]

  • 772

我有一个字符串数组 ['28','12','11,2']。您需要从中制作一个数字数组。我是从 csv 读取的，所以代码是这样的：

with open("..\csv\m.csv") as csvfile:
    reader = csv.DictReader(csvfile)

    arrayDistance = []

    for row in reader:
         arrayDistance.append(float(row['distance']))

print(arrayDistance)

弹出 在此处输入图像描述

python

2 个回答

  1. 您需要将“，”替换为“。” – “11.2”

    或者像这样在脚本中转换

    with open("..\csv\m.csv") as csvfile:
    reader = csv.DictReader(csvfile)

    arrayDistance = []

    for row in reader:
        new_str = row['distance'].replace(",", ".")
        arrayDistance.append(float(new_str))
print(arrayDistance)
    • 2
  2. Best Answer
    In [1]: n = ['28','12','11,2'] 

In [2]: [float(i.replace(',', '.')) for i in n]                                                        
Out[2]: [28.0, 12.0, 11.2]

    我们使用列表生成器。
    但是，如果我们将带有分号的字符串传递给浮点数，我们会得到一个错误ValueError: could not convert string to float:，然后在帮助下，replace我们将逗号替换为数字中的点。

    with open("..\csv\m.csv") as csvfile:
    reader = csv.DictReader(csvfile)

    arrayDistance = []

    for row in reader:
         arrayDistance.append(float(row['distance'].replace(',', '.')))

print(arrayDistance)

    试试这样。

    • 1

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