如何在python中不带括号的情况下写入文件 [英] How to write to file without parenthesis in python

问题描述

当我写文件结果时:

output=knew[i][0],knew[i][1], knew[i][2],eigenval[k],group[i]
value=str(output)
o.write(value+'\n')

我得到:

(0.05, 0.05, 0.166667, -0.8513056, 0.9881956035137526)
(0.05, 1.05, 0.166667, -0.8513056, 0.011652226336523394)
(0.05, -0.9500000000000002, 0.166667, -0.8513056, 0.00015217014972403685)

如何写文件而不加括号?

How to write to file so it doesn't add brackets?

推荐答案

代替

value = str(output)

你可以做

value = ', '.join(map(str, output))

您看到的是元组的字符串表示形式.在那里是因为您在其中调用了str.

What you see is the string representation of a tuple. It's there because you called str on it.

str.join 方法的作用是将可迭代对象(例如元组或列表)，将调用它的字符串用作定界符(此处', '是定界符，map(str, output)是字符串的可迭代变量.)成单个字符串. map 将函数应用于可迭代对象的每个元素.在这种情况下，str应用于output的每个元素，因此我们可以迭代字符串，而不是浮点数.

What the str.join method does is join an iterable (e.g. a tuple or a list) of strings, using the string that it's called on as a delimiter (here ', ' is the delimiter and map(str, output) is the iterable of strings.) into a single string. map applies a function to each element of an iterable. In this case, str is applied to each element of output, so that we have an iterable of strings, rather than float numbers.

或者(有点怪异)，您可以从具有的值中去除括号:

Alternatively (a bit hacky) you can just strip off the parentheses from the value that you have:

value = str(output)[1:-1]

这篇关于如何在python中不带括号的情况下写入文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！