从 Python 列表中的每个数字中减去一个值？
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Subtract a value from every number in a list in Python?
提问by jaycodez
I have a list
我有一个清单
a = [49, 51, 53, 56]
How do I subtract 13 from each integer value in the list?
如何从列表中的每个整数值中减去 13？
采纳答案by Ignacio Vazquez-Abrams
回答by Oscar Mederos
This will work:
这将起作用：
for i in range(len(a)):
a[i] -= 13
回答by shang
If are you working with numbers a lot, you might want to take a look at NumPy. It lets you perform all kinds of operation directly on numerical arrays. For example:
如果你经常使用数字，你可能想看看NumPy。它允许您直接对数值数组执行各种操作。例如：
>>> import numpy
>>> array = numpy.array([49, 51, 53, 56])
>>> array - 13
array([36, 38, 40, 43])
回答by JJ K.
To clarify an already posted solution due to questions in the comments
由于评论中的问题，澄清已经发布的解决方案
import numpy
array = numpy.array([49, 51, 53, 56])
array = array - 13
will output:
将输出：
array([36, 38, 40, 43])
数组([36, 38, 40, 43])
