{"id":128200,"date":"2022-09-17T05:43:24","date_gmt":"2022-09-17T05:43:24","guid":{"rendered":"https:\/\/blog.finxter.com\/?p=686087"},"modified":"2022-09-17T05:43:24","modified_gmt":"2022-09-17T05:43:24","slug":"how-to-find-the-longest-string-in-a-numpy-array","status":"publish","type":"post","link":"https:\/\/sickgaming.net\/blog\/2022\/09\/17\/how-to-find-the-longest-string-in-a-numpy-array\/","title":{"rendered":"How to Find the Longest String in a NumPy Array?"},"content":{"rendered":"\n
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5\/5 – (1 vote) <\/div>\n<\/div>\n

Python Longest String in NumPy Array<\/h2>\n

To find the longest string in a given NumPy array, say arr<\/code>, you can use the max(arr, key=len)<\/code> function that determines the maximum by comparing the length of the array elements using the len()<\/a><\/code> function as a key for comparison.<\/p>\n

import numpy as np arr = np.array(['Alice', 'Bob', 'Carl'])\nprint(max(arr, key=len))\n# Alice\n<\/pre>\n
You can find more about the powerful max()<\/code> function in our detailed blog tutorial:<\/p>\n
\"\ud83d\udc49\" Recommended Tutorial<\/strong>: Python Maximum Function<\/a><\/p>\n
Python Length of Longest String in NumPy Array<\/h2>\n
To find the length of the longest string in a NumPy array arr<\/code>, use the max(arr, key=len)<\/code> function to obtain the string with the maximum length and then pass this max string into the len()<\/code> function to obtain the number of characters of the max string.<\/p>\n
len(max(arr, key=len))<\/code><\/p>\n
Here’s a more detailed code example of a simple 1D NumPy Array:<\/p>\n
import numpy as np arr = np.array(['Alice', 'Bob', 'Carl']) # Print Longest String:\nprint(max(arr, key=len))\n# Alice # Print Length of Longest String\nprint(len(max(arr, key=len)))\n# 5\n<\/pre>\n
Get Longest String from NumPy Axis (2D, Column or Row)<\/h2>\n
To get the longest string from a certain NumPy array axis (e.g., row or column), first use simple NumPy slicing and indexing<\/a> to get that axis (e.g., arr[0, :]<\/code> to get the first row) and pass it into the max()<\/code> function with the key<\/code> argument set to the length function like so: max(arr[0, :], key=len)<\/code>.<\/p>\n
Here’s an example to get the longest string of the first row<\/strong> of a 2D array:<\/p>\n
import numpy as np arr = np.array([['Alice', 'Bob', 'Carl'], ['Ann', 'Zoe', 'Leonard']]) print(max(arr[0, :], key=len))\n# Alice\n<\/pre>\n
Here’s an example to get the longest string of the third column<\/strong> of a 2D array:<\/p>\n
print(max(arr[:, 2], key=len))\n# Leonard<\/pre>\n
You get the idea. \"\ud83d\ude42\"<\/p>\n
If you want to get the longest string from the whole NumPy array, not only from a column or row or axis, first flatten it and then pass the flattened array into the max()<\/code> function using the key=len<\/code> argument.<\/p>\n
\"\ud83d\udc49\" Recommended Tutorial<\/strong>: How to Flatten a NumPy Array?<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
5\/5 – (1 vote) Python Longest String in NumPy Array To find the longest string in a given NumPy array, say arr, you can use the max(arr, key=len) function that determines the maximum by comparing the length of the array elements using the len() function as a key for comparison. import numpy as np arr […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[857],"tags":[73,468,528],"class_list":["post-128200","post","type-post","status-publish","format-standard","hentry","category-python-tut","tag-programming","tag-python","tag-tutorial"],"_links":{"self":[{"href":"https:\/\/sickgaming.net\/blog\/wp-json\/wp\/v2\/posts\/128200","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sickgaming.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sickgaming.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sickgaming.net\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/sickgaming.net\/blog\/wp-json\/wp\/v2\/comments?post=128200"}],"version-history":[{"count":0,"href":"https:\/\/sickgaming.net\/blog\/wp-json\/wp\/v2\/posts\/128200\/revisions"}],"wp:attachment":[{"href":"https:\/\/sickgaming.net\/blog\/wp-json\/wp\/v2\/media?parent=128200"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sickgaming.net\/blog\/wp-json\/wp\/v2\/categories?post=128200"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sickgaming.net\/blog\/wp-json\/wp\/v2\/tags?post=128200"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}