将类型'str'转换为分子/分母 [英] Convert type 'str' to numerator/ denominator

问题描述

我在将类型'str'转换为数字时遇到麻烦.我使用包含以下数字1, 2, 3, 4, 5, 6的单独文本文件，然后将这些数字导入python并将其保存为列表.但是，通过这样做，我得到了如下的字符串列表:['1', '2', '3', '4', '5', '6'].我想转换此字符串列表，以便该列表表示数字，即输出应为[1, 2, 3, 4, 5, 6].

I'm having some trouble converting type 'str' to numbers. I use a separate text-file containing the following numbers 1, 2, 3, 4, 5, 6 and then I import these numbers into python and save them as a list. However, by doing this, I get a list of strings as follows: ['1', '2', '3', '4', '5', '6']. I want to convert this list of strings so the list represents numbers, i.e. the output should be [1, 2, 3, 4, 5, 6].

我的代码是:

def imported_numbers(filename):
    with open(filename, 'r') as f: 
        contents = f.read().splitlines() 
    print(contents)
imported_numbers('sample.txt')

是否有执行此操作的特定命令?

Is there a specific command to do this?

推荐答案

您可以使用

You can use map:

l = ['1', '2', '3', '4', '5', '6']

new_l = list(map(int, l))  # or just map(int, l) in Python 2

将返回

[1, 2, 3, 4, 5, 6]

如果某些字符串虽然不能转换为数字，则可能会引发错误:

This can throw an error if there are strings that cannot be converted to numbers though:

l = ['1', '2', '3', '4', '5', 'lkj']

list(map(int, l))

ValueError:以10为底的int()无效文字:'lkj'

ValueError: invalid literal for int() with base 10: 'lkj'

因此请确保您输入的内容有效和/或将其包装为try/except.

So make sure your input is valid and/or wrap it into a try/except.

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