{"id":130003,"date":"2022-11-23T18:44:10","date_gmt":"2022-11-23T18:44:10","guid":{"rendered":"https:\/\/blog.finxter.com\/?p=919072"},"modified":"2022-11-23T18:44:10","modified_gmt":"2022-11-23T18:44:10","slug":"easiest-way-to-convert-list-of-hex-strings-to-list-of-integers","status":"publish","type":"post","link":"https:\/\/sickgaming.net\/blog\/2022\/11\/23\/easiest-way-to-convert-list-of-hex-strings-to-list-of-integers\/","title":{"rendered":"Easiest Way to Convert List of Hex Strings to List of Integers"},"content":{"rendered":"\n
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5\/5 – (1 vote) <\/div>\n<\/div>\n

\"\ud83d\udcac\" Question<\/strong>: Given a Python list<\/a> of hexadecimal strings such as ['ff', 'ef', '0f', '0a', '93']<\/code>. How to convert it to a list of integers in Python such as [255, 239, 15, 10, 147]<\/code>?<\/p>\n

Easiest Answer<\/h2>\n
\n
\"\"<\/figure>\n<\/div>\n

The easiest way to convert a list of hex strings to a list of integers in Python is the list comprehension<\/a> statement [int(x, 16) for x in my_list]<\/code> that applies the built-in function int()<\/a><\/code> to convert each hex string to an integer using the hexadecimal base 16<\/code>, and repeats this for each hex string x<\/code> in the original list.<\/p>\n

Here’s a minimal example:<\/p>\n

my_list = ['ff', 'ef', '0f', '0a', '93']\nmy_ints = [int(x, 16) for x in my_list] print(my_ints)\n# [255, 239, 15, 10, 147]<\/pre>\n
The list comprehension<\/strong> statement applies the expression int(x, 16)<\/code> to each element x<\/code> in the list my_list<\/code> and puts the result of this expression in the newly-created list<\/a>. <\/p>\n
The int(x, 16)<\/strong><\/code> expression converts a hex string to an integer<\/a> using the hexadecimal base argument 16<\/code>. A semantically identical way to write this would be int(x, base=16)<\/code>. <\/p>\n
In fact, there are many more ways to convert a hex string to an integer—each of them could be used in the expression part <\/strong>of the list comprehension statement. <\/p>\n
However, I’ll show you one completely different approach to solving this problem without listing each and every combination of possible solutions. \"\ud83d\udc47\" <\/p>\n
For Loop with List Append<\/h2>\n
You can create an empty list<\/a> and add one hex integer at a time in the loop body after converting it from the hex string x<\/code> using the eval('0x' + x)<\/a><\/code> function call. This first creates a hexadecimal string with '0x'<\/code> prefix using string concatenation<\/a> and then lets Python evaluate the string as if it was real code and not a string. <\/p>\n
Here’s an example:<\/p>\n
my_list = ['ff', 'ef', '0f', '0a', '93'] my_ints = []\nfor x in my_list: my_ints.append(eval('0x' + x)) print(my_ints)\n# [255, 239, 15, 10, 147]<\/pre>\n
You use the fact that Python automatically converts a hex value of the form 0xff<\/code> to an integer 255<\/code>:<\/p>\n
>>> 0xff\n255\n>>> 0xfe\n254\n>>> 0x0f\n15<\/pre>\n
You may want to check out my in-depth guide on this important function for our solution:<\/p>\n
\"\ud83c\udf0d\" Recommended Tutorial<\/strong>: Python eval()<\/code><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
5\/5 – (1 vote) Question: Given a Python list of hexadecimal strings such as [‘ff’, ‘ef’, ‘0f’, ‘0a’, ’93’]. How to convert it to a list of integers in Python such as [255, 239, 15, 10, 147]? Easiest Answer The easiest way to convert a list of hex strings to a list of integers in […]<\/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-130003","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\/130003","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=130003"}],"version-history":[{"count":0,"href":"https:\/\/sickgaming.net\/blog\/wp-json\/wp\/v2\/posts\/130003\/revisions"}],"wp:attachment":[{"href":"https:\/\/sickgaming.net\/blog\/wp-json\/wp\/v2\/media?parent=130003"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sickgaming.net\/blog\/wp-json\/wp\/v2\/categories?post=130003"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sickgaming.net\/blog\/wp-json\/wp\/v2\/tags?post=130003"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}