用Numpy过滤数组字符串 [英] Filtering array strings with Numpy

问题描述

我该如何编写一个numpy函数，使其仅过滤出以'USD'结尾的数组字符串.我如何在没有for循环的情况下执行此过滤器.

How could I write a numpy function where it only filters out the array strings that ends with 'USD'. How would I be able to execute this filter without a for loop.

import numpy as np
Array= ['BTCUSD', 'ETHUSD', 'David', 'georGe', 'XRPUSD', 'USDAUD', 'ETHUSDC' ]

预期产量

['BTCUSD', 'ETHUSD',  'XRPUSD']

推荐答案

使用numpy 输出:

['BTCUSD' 'ETHUSD' 'XRPUSD']

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对于返回类型为 list 而不是 np.ndarray 的返回类型，可以使用理解:

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For a return type of list instead of np.ndarray a comprehension can be used:

import numpy as np

lst = np.array(['BTCUSD', 'ETHUSD', 'David', 'georGe', 'XRPUSD', 'USDAUD', 'ETHUSDC'])
print([elem for elem in lst if elem.endswith('USD')])

输出:

['BTCUSD', 'ETHUSD', 'XRPUSD']

*理解方法可用于Python列表以及np数组.

*The comprehension approach can be used on Python lists as well as np arrays.

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