{"id":52,"date":"2015-09-21T17:51:49","date_gmt":"2015-09-21T15:51:49","guid":{"rendered":"http:\/\/mickael.bucas.name\/blog\/?p=52"},"modified":"2019-01-31T12:38:29","modified_gmt":"2019-01-31T11:38:29","slug":"converting-a-python-project-to-pep8-with-shell","status":"publish","type":"post","link":"https:\/\/mickael.bucas.name\/blog\/2015\/09\/converting-a-python-project-to-pep8-with-shell\/","title":{"rendered":"Converting a Python project to PEP8 with Shell"},"content":{"rendered":"

When I started Python I didn’t learn PEP8 immediately so my code was not following the standard format. As I know Bash quite well, I’ve converted my projects later, with the following commands.<\/p>\n

Convert tabs to 4 spaces<\/p>\n

find . -name '*.py'|xargs pep8|grep W191|cut -d : -f1|xargs sed -i \"s\/\\t\/    \/g\"<\/pre>\n
Suppress spaces when they’re alone on the line<\/p>\n
find . -name '*.py'|xargs pep8|grep W293|cut -d : -f1|sort -u|xargs sed -i \"s\/^ *$\/\/\"<\/pre>\n
Suppress spaces at end of line<\/p>\n
find . -name '*.py'|xargs pep8|grep W291|cut -d : -f1|sort -u|xargs sed -i \"s\/ *$\/\/\"<\/pre>\n
Add spaces after “:”, “,”<\/p>\n
find . -name '*.py'|xargs pep8|grep E231|cut -d : -f1|sort -u|xargs sed -i 's\/:\\([^ ]\\)\/: \\1\/g'\nfind . -name '*.py'|xargs pep8|grep E231|cut -d : -f1|sort -u|xargs sed -i 's\/,\\([^ ]\\)\/, \\1\/g'<\/pre>\n
Suppress spaces before or after {} [] ()<\/p>\n
find . -name '*.py'|xargs pep8|grep E201|cut -d : -f1|sort -u|xargs sed -i 's\/{ *\/{\/g'\nfind . -name '*.py'|xargs pep8|grep E201|cut -d : -f1|sort -u|xargs sed -i 's\/\\[ *\/[\/g'\nfind . -name '*.py'|xargs pep8|grep E201|cut -d : -f1|sort -u|xargs sed -i 's\/( *\/(\/g'\nfind . -name '*.py'|xargs pep8|grep E202|cut -d : -f1|sort -u|xargs sed -i 's\/ *}\/}\/g'\nfind . -name '*.py'|xargs pep8|grep E202|cut -d : -f1|sort -u|xargs sed -i 's\/ *]\/]\/g'\nfind . -name '*.py'|xargs pep8|grep E202|cut -d : -f1|sort -u|xargs sed -i 's\/ *)\/)\/g'<\/pre>\n
Suppress spaces before “(“, “:”<\/p>\n
find . -name '*.py'|xargs pep8|grep E211|cut -d : -f1|sort -u|xargs sed -i 's\/ *(\/(\/g'\nfind . -name '*.py'|xargs pep8|grep E203|cut -d : -f1|sort -u|xargs sed -i 's\/ *:\/:\/g'<\/pre>\n
Add a blank line at end of file<\/p>\n
find . -name '*.py'|xargs pep8|grep W292|cut -d: -f1|while read f; do echo >> $f; done<\/pre>\n
Add a blank line before “def” or “class”, to be run two times<\/p>\n
find . -name '*.py'|xargs pep8|grep E302|cut -d : -f1|sort -u|xargs sed -i 's\/^def\/\\ndef\/'\nfind . -name '*.py'|xargs pep8|grep E302|cut -d : -f1|sort -u|xargs sed -i 's\/^class\/\\nclass\/'<\/pre>\n
Sometimes I don’t really want to cut long lines, so I keep lines up to 120 characters<\/p>\n
find . -name '*.py'|xargs pep8 --max-line-length=120<\/pre>\n
I think that 80 is to restrictive and based on terminals of the last century or on paper sizes that no one uses any more.<\/p>\n
However, I’ve learned how to cut long lines with chained calls.<\/p>\n
Before:<\/p>\n
compte.dernier_solde = SoldeJour.objects.filter(compte_id=compte.id).order_by('-date_solde')[0].solde<\/pre>\n
After, with parenthesis to tell the Python parser that a single expression is on multiple lines:<\/p>\n
compte.dernier_solde = (\nSoldeJour\n.objects\n.filter(compte_id=compte.id)\n.order_by('-date_solde')[0]\n.solde\n)\n<\/pre>\n
I’ve also configured Scite, my favorite editor, for spaces and tabs.<\/p>\n
use.tabs=0\ntabsize=4\nindent.size=4<\/pre>\n","protected":false},"excerpt":{"rendered":"
When I started Python I didn’t learn PEP8 immediately so my code was not following the standard format. As I know Bash quite well, I’ve converted my projects later, with the following commands. Convert tabs to 4 spaces find . -name ‘*.py’|xargs pep8|grep W191|cut -d : -f1|xargs sed -i “s\/\\t\/ \/g” Suppress spaces when they’re…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8,10],"tags":[],"class_list":["post-52","post","type-post","status-publish","format-standard","hentry","category-linux","category-python"],"_links":{"self":[{"href":"https:\/\/mickael.bucas.name\/blog\/wp-json\/wp\/v2\/posts\/52","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mickael.bucas.name\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mickael.bucas.name\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mickael.bucas.name\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mickael.bucas.name\/blog\/wp-json\/wp\/v2\/comments?post=52"}],"version-history":[{"count":5,"href":"https:\/\/mickael.bucas.name\/blog\/wp-json\/wp\/v2\/posts\/52\/revisions"}],"predecessor-version":[{"id":94,"href":"https:\/\/mickael.bucas.name\/blog\/wp-json\/wp\/v2\/posts\/52\/revisions\/94"}],"wp:attachment":[{"href":"https:\/\/mickael.bucas.name\/blog\/wp-json\/wp\/v2\/media?parent=52"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mickael.bucas.name\/blog\/wp-json\/wp\/v2\/categories?post=52"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mickael.bucas.name\/blog\/wp-json\/wp\/v2\/tags?post=52"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}