{"id":18348,"date":"2022-10-31T04:16:21","date_gmt":"2022-10-30T22:46:21","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-one-liner-for-calling-a-function-for-each-line-in-a-file-closed\/"},"modified":"2022-10-31T04:16:21","modified_gmt":"2022-10-30T22:46:21","slug":"solved-one-liner-for-calling-a-function-for-each-line-in-a-file-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-one-liner-for-calling-a-function-for-each-line-in-a-file-closed\/","title":{"rendered":"[Solved] One-liner for calling a function for each line in a file [closed]"},"content":{"rendered":"

[ad_1]
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Well, almost in one line (if you allow me to import the itertools module<\/a>):<\/p>\n

[ x for x in itertools.takewhile(\n    lambda line: sync(line) == 0,    # <- predicate\n    open(\"file.txt\")) ]              # <- iterable\n<\/code><\/pre>\n
Example w\/o file:<\/p>\n
>>> import itertools\n>>> def sync(n):\n...   if n == 3: return -1 # error\n...   return 0\n\n>>> lines = [1, 2, 3, 4, 5, 6]\n>>> [ x for x in itertools.takewhile(lambda x: sync(x) == 0, lines) ]\n[1, 2]\n<\/code><\/pre>\n
But you really should not obscure things, so why not just:<\/p>\n
with open(\"file\") as fh:\n    for line in fh:\n        if not sync(int(line)) == 0:\n            break\n<\/code><\/pre>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            <\/span> <\/p><\/div>\n<\/div>\n
[ad_2]<\/p>\n
solved One-liner for calling a function for each line in a file [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] Well, almost in one line (if you allow me to import the itertools module): [ x for x in itertools.takewhile( lambda line: sync(line) == 0, # <- predicate open(“file.txt”)) ] # <- iterable Example w\/o file: >>> import itertools >>> def sync(n): … if n == 3: return -1 # error … return 0 … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[575,349],"class_list":["post-18348","post","type-post","status-publish","format-standard","hentry","category-solved","tag-file-io","tag-python"],"yoast_head":"\n[Solved] One-liner for calling a function for each line in a file [closed] - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-one-liner-for-calling-a-function-for-each-line-in-a-file-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] One-liner for calling a function for each line in a file [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Well, almost in one line (if you allow me to import the itertools module): [ x for x in itertools.takewhile( lambda line: sync(line) == 0, # <- predicate open("file.txt")) ] # <- iterable Example w\/o file: >>> import itertools >>> def sync(n): ... if n == 3: return -1 # error ... return 0 ... 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